[Config] Round 6.4: the runtime reads the bags, not the record (#38049)

Last of four; stacked on #38048.

The record is the operator's input; the bags are what is in effect. A reader
that takes the record and reads a field off it gets the input, which is the
wrong one of the two whenever resolution decided something -- and the mistake is
silent, because for most fields and most launches the two agree. Several of
these files already read both ways, sometimes in the same expression:

```python
get_tokenizer(
    get_serving().tokenizer_path,
    tokenizer_mode=server_args.tokenizer_mode,   # the input, not the decision
    ...
)
```

Sixty-odd files convert. Record field reads in runtime code go from 199 to 11.
Nine parameters that the conversion emptied are dropped along with the argument
at every call site -- the dead-parameter ratchet is what names them.

### "Runs after its process publishes" is a per-entry-point claim

Most converted reads sit in the serving and model-executor layers, which only
exist after publication, or in the two subprocess entry points, which publish
first thing. Three places are not like that, and they keep reading the record
they were handed:

- **`HttpServerEngineAdapter`** launches the server as a *child*. The parent
  resolves the record and never publishes, so the adapter's own reads -- the
  launch banner, the API key in its readiness loop, the TP width in
  `update_weights_from_tensor` -- are of `self.server_args`. A bag read here
  fails closed in a bare process, or answers for an unrelated engine in one that
  happens to have published.
- **`serve_grpc`** reads its sidecar port before the integrated servicer builds
  the `Engine` that publishes. The comment above that line already said so and
  already bound `cfg = resolving_view(server_args)` for it; the sidecar port and
  the port it derives from read `cfg`.
- **`initialize_dp_attention`** runs from callers whose publish is not
  guaranteed, so its one predicate stays on the resolution view.

`ROLE_NAMESPACE_SETS["dp_controller"]` gains `observability` and `serving`,
because the controller's metrics gate, tracing setup and worker-port broadcast
now read those namespaces. Under `SGLANG_ROLE_NAMESPACES=enforce` that set is
what the process may read, so a conversion that reaches a new namespace has to
widen it in the same change.

## Three things worth a reviewer's attention

**Eleven reads were `getattr(record, "field", default)`.** An AST scan for
attribute access does not see those, so the census that said "43 readers" was
counting the shape it could match rather than the thing it was after.
`incremental_streaming_output` was read that way twice, and the transcription
tests were the only reason it surfaced.

**Not every record read is a bag read waiting to happen.** A multimodal
processor's `base_gpu_id` is the instance's, not the process's: two engines in
one process keep different ones, and
`test_publishing_another_config_does_not_move_the_device` exists to say so. It
stays on the record while `rl_on_policy_target` beside it moves.
`RequestMetricsExporter` is the same shape -- it is handed the directory it
writes to, and a test builds several with different ones. `configure_logger` is
a third: 17 call sites, one of which passes an `argparse.Namespace`, so it is
not a global-context reader at all. Those eleven remaining reads are the ones
with a reason.

**The fixtures move with the code.** Tests that hung config off a mock manager
now publish a record, which is what the serving layer reads; where a test states
a value it says so with `override_server_args` instead of assigning through the
mock. `test_hisparse_unit` is the last of them: it stubbed a `server_args` onto
a fake scheduler to say the decode radix cache was off, and the value it was
standing in for is the published default, so the stub goes and the class
publishes.

## Two things CI caught that a local sweep could not

**`unittest.TestCase.enterContext` is Python 3.11+.** The converted fixtures used
it at 18 sites; `requires-python` is `>=3.10` and CI runs 3.10, so every one of
them raised `AttributeError` there while passing on a newer local interpreter.
They call `enter_override(self, ...)` now -- a four-line helper in
`sglang/test/test_utils.py` over the override's own `install()` / `restore()`.

**A batched sweep cannot see a missing publish.** Three fixtures needed a
published config and did not have one; each *passed* inside a shard where some
other file had published, and failed when run alone. The affected cases are
`test_serving_completions` (which set `incremental_streaming_output` on the mock
manager's record, where nothing reads it now), `test_qwen3_vl_feature_materialization`
(same shape for `mm_enable_dp_encoder`), and the two Qwen Rust tests -- whose
fixture already carried the comment `# Non-auto: get_resolved_model_impl would
choke on a SimpleNamespace` next to the `model_impl` it sets, which is exactly
what happened once `get_mm_processor_cls` started reading that value from the
bag. Its `publish` mirrors `model_impl` now, like the four fields it already
mirrored.

## Verification

A full registered-unit sweep (648 files) against this stack's merge-base:
19 failures on both sides, the same 19, none of them config. That sweep is what
caught 23 failures the file-scoped runs missed -- and, later, that the narrower
139-file list did not even contain the files this change reaches. It is also
what caught the `test_hisparse_unit` fixture above: the file passes inside a
shard where something else published, and fails when it is run on its own,
which is why every failing file is re-run alone before it is counted.

python/sglang/srt/constrained/grammar_manager.py

@@ -14,6 +14,7 @@ from sglang.srt.constrained.base_grammar_backend import (
 from sglang.srt.constrained.reasoner_grammar_backend import ReasonerGrammarObject
 from sglang.srt.distributed.communication_tags import P2PTag
 from sglang.srt.environ import envs
+from sglang.srt.runtime_context import get_serving
 from sglang.srt.sampling.sampling_params import (
     get_request_reasoning_end_token_ids,
 )
@@ -31,7 +32,7 @@ class GrammarManager:
         self.scheduler = scheduler
         self.server_args = scheduler.server_args
         self.grammar_queue: List[Req] = []
-        if not self.server_args.skip_tokenizer_init:
+        if not get_serving().skip_tokenizer_init:
             self.grammar_backend = create_grammar_backend(
                 self.server_args,
                 scheduler.tokenizer,

python/sglang/srt/disaggregation/decode.py

@@ -468,11 +468,7 @@ class DecodePreallocQueue(DecodeHiCachePreallocMixin):
             return seq_len
 
         page_size = self.token_to_kv_pool_allocator.page_size
-        if getattr(
+        if get_disagg().disaggregation_decode_enable_radix_cache:
-            self.scheduler.server_args,
-            "disaggregation_decode_enable_radix_cache",
-            False,
-        ):
             # Keep enough SWA before the page-aligned radix-cache insert
             # boundary for the cached key to contain a complete window.
             # `seq_len - 1` is the last committed position.
@@ -1194,7 +1190,7 @@ class DecodePreallocQueue(DecodeHiCachePreallocMixin):
             origin_input_len = self._rebootstrap_prefill_len(decode_req.req)
             prefix_match: Optional[DecodePrefixMatch] = None
             use_decode_radix_cache = (
-                self.scheduler.server_args.disaggregation_decode_enable_radix_cache
+                get_disagg().disaggregation_decode_enable_radix_cache
                 and not decode_req.is_rebootstrap
             )
             if use_decode_radix_cache:
@@ -1648,13 +1644,13 @@ class DecodePreallocQueue(DecodeHiCachePreallocMixin):
                 available_size = logical_allocator.available_size()
         elif self._uses_swa_tail_prealloc():
             available_size = self.token_to_kv_pool_allocator.full_available_size()
-            if self.scheduler.server_args.disaggregation_decode_enable_radix_cache:
+            if get_disagg().disaggregation_decode_enable_radix_cache:
                 available_size += self._radix_full_evictable()
         else:
             available_size = self.token_to_kv_pool_allocator.available_size()
             # Include evictable decode-radix cache entries in the budget -- they
             # can be freed on demand before allocation.
-            if self.scheduler.server_args.disaggregation_decode_enable_radix_cache:
+            if get_disagg().disaggregation_decode_enable_radix_cache:
                 available_size += self._radix_full_evictable()
         allocatable_tokens = available_size - max(
             reserved_tokens, need_space_for_single_req
@@ -1801,7 +1797,7 @@ class DecodePreallocQueue(DecodeHiCachePreallocMixin):
 
         # Evict cached entries if the pool doesn't have enough free pages.
         if (
-            self.scheduler.server_args.disaggregation_decode_enable_radix_cache
+            get_disagg().disaggregation_decode_enable_radix_cache
             and self._radix_full_available() < required_alloc_tokens
         ):
             num_to_evict = required_alloc_tokens - self._radix_full_available()

python/sglang/srt/disaggregation/encoder/grpc_server.py

@@ -251,8 +251,8 @@ async def serve_grpc_encoder(server_args: ServerArgs):
     ipc_path_prefix = random_uuid()
     port_args = PortArgs.init_new(server_args)
 
-    if server_args.dist_init_addr:
+    if get_parallel().dist_init_addr:
-        na = NetworkAddress.parse(server_args.dist_init_addr)
+        na = NetworkAddress.parse(get_parallel().dist_init_addr)
         dist_init_method = na.to_tcp()
     else:
         dist_init_method = NetworkAddress(

python/sglang/srt/disaggregation/encoder/http_server.py

@@ -103,7 +103,7 @@ async def _lifespan(app: FastAPI):
 app = FastAPI(lifespan=_lifespan)
 
 
-def _register_encoder_url_with_bootstrap(server_args: ServerArgs):
+def _register_encoder_url_with_bootstrap():
     """Asynchronously register this encoder with each bootstrap URL.
 
     Spawns a daemon thread that retries each URL independently with bounded
@@ -118,10 +118,10 @@ def _register_encoder_url_with_bootstrap(server_args: ServerArgs):
     host = get_serving().host
     if not host or host in ("0.0.0.0", "::"):
         host = get_local_ip_auto(get_serving().host)
-    scheme = "https" if server_args.ssl_certfile else "http"
+    scheme = "https" if get_serving().ssl_certfile else "http"
     encoder_url = NetworkAddress(host, get_serving().port).to_url(scheme)
     payload = {"url": encoder_url}
-    bootstrap_urls = list(server_args.encoder_register_urls)
+    bootstrap_urls = list(get_disagg().encoder_register_urls)
     if not bootstrap_urls:
         return
 
@@ -175,15 +175,15 @@ def _register_encoder_url_with_bootstrap(server_args: ServerArgs):
     ).start()
 
 
-def _unregister_encoder_url_from_bootstrap(server_args: ServerArgs):
+def _unregister_encoder_url_from_bootstrap():
     host = get_serving().host
     if not host or host in ("0.0.0.0", "::"):
         host = get_local_ip_auto(get_serving().host)
-    scheme = "https" if server_args.ssl_certfile else "http"
+    scheme = "https" if get_serving().ssl_certfile else "http"
     encoder_url = NetworkAddress(host, get_serving().port).to_url(scheme)
     payload = {"url": encoder_url}
 
-    for bootstrap_url in server_args.encoder_register_urls:
+    for bootstrap_url in get_disagg().encoder_register_urls:
         try:
             resp = http_requests.delete(
                 f"{bootstrap_url}/unregister_encoder_url",
@@ -229,8 +229,8 @@ def launch_server(server_args: ServerArgs):
     if get_disagg().encoder_register_urls:
         import atexit
 
-        _register_encoder_url_with_bootstrap(server_args)
+        _register_encoder_url_with_bootstrap()
-        atexit.register(_unregister_encoder_url_from_bootstrap, server_args)
+        atexit.register(_unregister_encoder_url_from_bootstrap)
 
     uvicorn.run(app, host=get_serving().host, port=get_serving().port)
 

python/sglang/srt/disaggregation/encoder/receiver.py

@@ -2000,7 +2000,7 @@ class MMReceiverBase(ABC):
         import_processors("sglang.srt.multimodal.processors")
 
         extra_kwargs = {}
-        if getattr(server_args, "tokenizer_backend", None) is not None:
+        if get_serving().tokenizer_backend is not None:
             extra_kwargs["tokenizer_backend"] = get_serving().tokenizer_backend
 
         _processor = get_processor(

python/sglang/srt/disaggregation/encoder/runtime.py

@@ -52,6 +52,7 @@ from sglang.srt.observability.trace import (
     trace_set_thread_info,
 )
 from sglang.srt.runtime_context import (
+    get_device,
     get_observability,
     get_parallel,
     get_serving,
@@ -1867,7 +1868,7 @@ def launch_dp_runtime(server_args: ServerArgs) -> DPDispatcher:
     atexit.register(_kill_workers)
 
     for dp_rank in range(dp_size):
-        gpu_id = server_args.base_gpu_id + dp_rank
+        gpu_id = get_device().base_gpu_id + dp_rank
         # Pin the device parent-side around spawn (same convention as the
         # scheduler launcher and DP controller) so the child inherits
         # CUDA_VISIBLE_DEVICES from its first instruction, before any import
@@ -1890,8 +1891,8 @@ def launch_dp_runtime(server_args: ServerArgs) -> DPDispatcher:
         worker_processes.append(process)
 
     labels = {"model_name": get_serving().served_model_name}
-    if server_args.extra_metric_labels:
+    if get_observability().extra_metric_labels:
-        labels.update(server_args.extra_metric_labels)
+        labels.update(get_observability().extra_metric_labels)
     return DPDispatcher(
         dp_size,
         dispatch_sockets,

python/sglang/srt/disaggregation/encoder/server.py

@@ -548,7 +548,7 @@ class MMEncoder:
         self.server_args = server_args
         configure_media_url_security(
             get_mm().allowed_media_domains,
-            server_args.media_url_max_file_size_mb,
+            get_mm().media_url_max_file_size_mb,
         )
         self.transfer_backend = get_disagg().encoder_transfer_backend
         self.use_mooncake = self.transfer_backend == "mooncake"
@@ -563,18 +563,18 @@ class MMEncoder:
         )
         self.load_config = LoadConfig(
             load_format=get_model().load_format,
-            download_dir=server_args.download_dir,
+            download_dir=get_model().download_dir,
             model_loader_extra_config=get_model().model_loader_extra_config,
-            remote_instance_weight_loader_seed_instance_ip=server_args.remote_instance_weight_loader_seed_instance_ip,
+            remote_instance_weight_loader_seed_instance_ip=get_model().remote_instance_weight_loader_seed_instance_ip,
-            remote_instance_weight_loader_seed_instance_service_port=server_args.remote_instance_weight_loader_seed_instance_service_port,
+            remote_instance_weight_loader_seed_instance_service_port=get_model().remote_instance_weight_loader_seed_instance_service_port,
-            remote_instance_weight_loader_send_weights_group_ports=server_args.remote_instance_weight_loader_send_weights_group_ports,
+            remote_instance_weight_loader_send_weights_group_ports=get_model().remote_instance_weight_loader_send_weights_group_ports,
         )
         self.model_type = getattr(
             self.model_config.hf_config, "model_type", "unknown"
         ).lower()
 
         self.device = get_device().device
-        self.gpu_id = server_args.base_gpu_id + rank if gpu_id is None else gpu_id
+        self.gpu_id = get_device().base_gpu_id + rank if gpu_id is None else gpu_id
 
         self.device_config = DeviceConfig(
             device=self.device,

python/sglang/srt/distributed/bootstrap.py

@@ -81,14 +81,14 @@ def init_torch_distributed(
     tic = time.perf_counter()
     logger.info("Init torch distributed begin.")
 
-    backend = _resolve_backend(device=device, server_args=server_args)
+    backend = _resolve_backend(device=device)
 
     before_avail_memory = get_available_gpu_memory(device, ps.gpu_id)
     if not get_parallel().enable_p2p_check:
         monkey_patch_p2p_access_check()
 
     dist_init_method = _resolve_dist_init_method(dist_port=dist_port)
-    _set_all_reduce_flags(server_args=server_args)
+    _set_all_reduce_flags()
 
     if not is_draft_worker:
         if device == "cpu":
@@ -173,9 +173,9 @@ def init_torch_distributed(
     )
 
 
-def _resolve_backend(*, device: str, server_args: ServerArgs) -> str:
+def _resolve_backend(*, device: str) -> str:
     backend = get_default_distributed_backend(device)
-    if device == "cuda" and server_args.elastic_ep_backend == "mooncake":
+    if device == "cuda" and get_exec().moe.elastic_ep_backend == "mooncake":
         backend = "mooncake"
     return backend
 
@@ -198,9 +198,9 @@ def _resolve_dist_init_method(*, dist_port: int) -> str:
     return dist_init_method
 
 
-def _set_all_reduce_flags(*, server_args: ServerArgs) -> None:
+def _set_all_reduce_flags() -> None:
     set_custom_all_reduce(not get_exec().comm.disable_custom_all_reduce)
-    set_mscclpp_all_reduce(server_args.enable_mscclpp)
+    set_mscclpp_all_reduce(get_exec().comm.enable_mscclpp)
     set_torch_symm_mem_all_reduce(get_exec().comm.enable_torch_symm_mem)
     set_flashinfer_allreduce_only(
         get_exec().comm.flashinfer_allreduce_fusion_backend is not None
@@ -295,7 +295,7 @@ def _init_parallel_groups(
         duplicate_tp_group=get_disagg().enable_pdmux,
         duplicate_attn_cp_group=(
             is_hip()
-            and server_args.enable_two_batch_overlap
+            and get_exec().overlap.enable_two_batch_overlap
             and get_parallel().enable_dsa_prefill_context_parallel
         ),
         enable_symm_mem=get_exec().comm.enable_symm_mem,
@@ -308,10 +308,7 @@ def _init_parallel_groups(
         server_args=server_args,
         model_config=model_config,
     )
-    initialize_layernorm_sp(
+    initialize_layernorm_sp(model_config=model_config)
-        server_args=server_args,
-        model_config=model_config,
-    )
     if is_npu():
         register_sgl_tp_rank(gpu_id)
 

python/sglang/srt/entrypoints/elastic_ep.py

@@ -6,6 +6,7 @@ from http import HTTPStatus
 from fastapi import APIRouter, Request
 from fastapi.responses import ORJSONResponse
 
+from sglang.srt.runtime_context import get_exec
 from sglang.srt.utils.auth import AuthLevel, auth_level
 
 router = APIRouter()
@@ -43,7 +44,7 @@ async def scale_elastic_ep(raw_request: Request):
     from sglang.srt.entrypoints.http_server import _global_state
     from sglang.srt.managers.io_struct import ScaleElasticEPReqInput
 
-    if _global_state.tokenizer_manager.server_args.elastic_ep_backend is None:
+    if get_exec().moe.elastic_ep_backend is None:
         return ORJSONResponse(
             {"error": "elastic EP is not enabled (set --elastic-ep-backend)"},
             status_code=HTTPStatus.NOT_FOUND,
@@ -78,7 +79,7 @@ async def is_scaling_elastic_ep(raw_request: Request):
     """Return the tokenizer's mirrored Elastic EP scale state."""
     from sglang.srt.entrypoints.http_server import _global_state
 
-    if _global_state.tokenizer_manager.server_args.elastic_ep_backend is None:
+    if get_exec().moe.elastic_ep_backend is None:
         return ORJSONResponse(
             {"error": "elastic EP is not enabled (set --elastic-ep-backend)"},
             status_code=HTTPStatus.NOT_FOUND,

python/sglang/srt/entrypoints/engine.py

@@ -104,9 +104,11 @@ from sglang.srt.parser.template_manager import TemplateManager
 from sglang.srt.platforms import current_platform
 from sglang.srt.plugins import load_plugins
 from sglang.srt.runtime_context import (
+    get_device,
     get_disagg,
     get_exec,
     get_model,
+    get_observability,
     get_parallel,
     get_serving,
     publish,
@@ -315,7 +317,7 @@ class Engine(EngineScoreMixin, EngineBase):
 
         # Initialize ZMQ sockets
         context = zmq.Context(2)
-        if self.server_args.node_rank == 0:
+        if get_parallel().node_rank == 0:
             self.send_to_rpc = get_zmq_socket(
                 context, zmq.DEALER, self.port_args.rpc_ipc_name, True
             )
@@ -323,11 +325,11 @@ class Engine(EngineScoreMixin, EngineBase):
             self.send_to_rpc = None
 
         # Enable tracing
-        if server_args.enable_trace:
+        if get_observability().enable_trace:
             process_tracing_init(
-                server_args.otlp_traces_endpoint,
+                get_observability().otlp_traces_endpoint,
                 "sglang",
-                trace_modules=server_args.trace_modules,
+                trace_modules=get_observability().trace_modules,
             )
             thread_label = "Tokenizer"
             if get_disagg().disaggregation_mode == "prefill":
@@ -691,27 +693,27 @@ class Engine(EngineScoreMixin, EngineBase):
         # Multi-node needs an explicit rendezvous address; otherwise each node
         # picks its own local 127.0.0.1 port (below) and the per-node daemons
         # can never form the joint process group.
-        if server_args.nnodes > 1 and not server_args.dist_init_addr:
+        if get_parallel().nnodes > 1 and not get_parallel().dist_init_addr:
             raise ValueError(
                 "Multi-node weight cache daemons (nnodes > 1) require "
                 "--dist-init-addr so all nodes rendezvous at the same endpoint."
             )
 
-        tp_size = server_args.tp_size
+        tp_size = get_parallel().tp_size
 
         pp_rank_range, tp_rank_range, pp_size_per_node, tp_size_per_node = (
             _calculate_rank_ranges(
-                server_args.nnodes,
+                get_parallel().nnodes,
                 get_parallel().pp_size,
                 tp_size,
-                server_args.node_rank,
+                get_parallel().node_rank,
             )
         )
 
         # Build the distributed init method (multi-node uses the user-provided
         # dist_init_addr so all nodes reach the same endpoint).
-        if server_args.dist_init_addr:
+        if get_parallel().dist_init_addr:
-            host, port = server_args.dist_init_addr.rsplit(":", 1)
+            host, port = get_parallel().dist_init_addr.rsplit(":", 1)
             dist_init_method = f"tcp://{host}:{port}"
         else:
             # Fresh free port for the daemons' own rendezvous, not the engine's
@@ -723,7 +725,7 @@ class Engine(EngineScoreMixin, EngineBase):
         daemon_procs = []
         logger.info(
             f"Launching {num_daemons} weight cache daemon(s) on node "
-            f"{server_args.node_rank} for model={get_model().model_path}, "
+            f"{get_parallel().node_rank} for model={get_model().model_path}, "
             f"pp_ranks={pp_rank_range.start}..{pp_rank_range.stop - 1}, "
             f"tp_ranks={tp_rank_range.start}..{tp_rank_range.stop - 1}, "
             f"dist_init_method={dist_init_method}"
@@ -738,8 +740,8 @@ class Engine(EngineScoreMixin, EngineBase):
                     tp_rank,
                     pp_size_per_node,
                     tp_size_per_node,
-                    base_gpu_id=server_args.base_gpu_id,
+                    base_gpu_id=get_device().base_gpu_id,
-                    gpu_id_step=server_args.gpu_id_step,
+                    gpu_id_step=get_device().gpu_id_step,
                 )
                 cleanup_stale_daemon_files(current_platform.get_device_uuid(gpu_id))
 
@@ -750,8 +752,8 @@ class Engine(EngineScoreMixin, EngineBase):
                     tp_rank,
                     pp_size_per_node,
                     tp_size_per_node,
-                    base_gpu_id=server_args.base_gpu_id,
+                    base_gpu_id=get_device().base_gpu_id,
-                    gpu_id_step=server_args.gpu_id_step,
+                    gpu_id_step=get_device().gpu_id_step,
                 )
                 proc = spawn_weight_cache_daemon(
                     server_args,
@@ -767,7 +769,7 @@ class Engine(EngineScoreMixin, EngineBase):
         # (readiness timeout or a daemon exiting early) terminate the siblings
         # we already spawned before propagating, so a partial launch does not
         # leak GPU-resident daemons.
-        timeout = server_args.weight_cache_timeout
+        timeout = get_model().weight_cache_timeout
         check_interval = 2
         start_time = time.time()
         try:
@@ -778,8 +780,8 @@ class Engine(EngineScoreMixin, EngineBase):
                         tp_rank,
                         pp_size_per_node,
                         tp_size_per_node,
-                        base_gpu_id=server_args.base_gpu_id,
+                        base_gpu_id=get_device().base_gpu_id,
-                        gpu_id_step=server_args.gpu_id_step,
+                        gpu_id_step=get_device().gpu_id_step,
                     )
                     ready_path = get_ready_path(
                         current_platform.get_device_uuid(gpu_id)
@@ -809,7 +811,7 @@ class Engine(EngineScoreMixin, EngineBase):
 
         logger.info(
             f"All {num_daemons} weight cache daemons on node "
-            f"{server_args.node_rank} are ready"
+            f"{get_parallel().node_rank} are ready"
         )
         return daemon_procs
 
@@ -864,16 +866,16 @@ class Engine(EngineScoreMixin, EngineBase):
         if not use_dp_controller:
             # Launch tensor parallel scheduler processes
             memory_saver_adapter = TorchMemorySaverAdapter.create(
-                enable=server_args.enable_memory_saver
+                enable=get_exec().features.enable_memory_saver
             )
             scheduler_pipe_readers = []
 
             pp_rank_range, tp_rank_range, pp_size_per_node, tp_size_per_node = (
                 _calculate_rank_ranges(
-                    server_args.nnodes,
+                    get_parallel().nnodes,
                     get_parallel().pp_size,
-                    server_args.tp_size,
+                    get_parallel().tp_size,
-                    server_args.node_rank,
+                    get_parallel().node_rank,
                 )
             )
 
@@ -881,12 +883,12 @@ class Engine(EngineScoreMixin, EngineBase):
                 for tp_rank in tp_rank_range:
                     reader, writer = mp.Pipe(duplex=False)
                     gpu_id = (
-                        server_args.base_gpu_id
+                        get_device().base_gpu_id
                         + ((pp_rank % pp_size_per_node) * tp_size_per_node)
-                        + (tp_rank % tp_size_per_node) * server_args.gpu_id_step
+                        + (tp_rank % tp_size_per_node) * get_device().gpu_id_step
                     )
                     attn_cp_rank, moe_dp_rank, moe_ep_rank = _compute_parallelism_ranks(
-                        server_args, tp_rank
+                        tp_rank
                     )
 
                     with maybe_reindex_device_id(gpu_id) as gpu_id:
@@ -1109,9 +1111,9 @@ class Engine(EngineScoreMixin, EngineBase):
             engine_info_bootstrap_server = None
             if (
                 get_model().remote_instance_weight_loader_start_seed_via_transfer_engine
-                and server_args.node_rank == 0
+                and get_parallel().node_rank == 0
             ):
-                bootstrap_port = server_args.engine_info_bootstrap_port
+                bootstrap_port = get_model().engine_info_bootstrap_port
                 if not is_port_available(bootstrap_port):
                     raise RuntimeError(
                         f"engine_info_bootstrap_port {bootstrap_port} is already in use. "
@@ -1119,13 +1121,13 @@ class Engine(EngineScoreMixin, EngineBase):
                         f"different --engine-info-bootstrap-port."
                     )
                 engine_info_bootstrap_server = EngineInfoBootstrapServer(
-                    host=server_args.host, port=bootstrap_port
+                    host=get_serving().host, port=bootstrap_port
                 )
 
             # Launch daemons (daemon mode only). The handles travel back to the
             # Engine that spawned them; shutdown() reaps from there.
             weight_cache_daemon_procs: List = []
-            if server_args.weight_cache_mode == "daemon":
+            if get_model().weight_cache_mode == "daemon":
                 weight_cache_daemon_procs = cls._launch_weight_cache_daemons(
                     server_args
                 )
@@ -1147,12 +1149,12 @@ class Engine(EngineScoreMixin, EngineBase):
         )
 
         if (
-            server_args.enable_elastic_expert_backup
+            get_exec().moe.enable_elastic_expert_backup
-            and server_args.elastic_ep_backend is not None
+            and get_exec().moe.elastic_ep_backend is not None
         ):
             run_expert_backup_manager(server_args, port_args)
 
-        if server_args.node_rank >= 1:
+        if get_parallel().node_rank >= 1:
             # Non-zero-rank nodes do not run tokenizer processes.
             scheduler_init_result.wait_for_ready()
 
@@ -1168,7 +1170,9 @@ class Engine(EngineScoreMixin, EngineBase):
                 )
 
             launch_dummy_health_check_server(
-                server_args.host, server_args.port, server_args.enable_metrics
+                get_serving().host,
+                get_serving().port,
+                get_observability().enable_metrics,
             )
 
             scheduler_init_result.block_until_scheduler_exits()
@@ -1215,7 +1219,7 @@ class Engine(EngineScoreMixin, EngineBase):
             scheduler_init_result.all_child_pids.append(p.pid)
 
         # Init tokenizer manager first, as the bootstrap server is initialized here
-        if server_args.tokenizer_worker_num == 1:
+        if get_serving().tokenizer_worker_num == 1:
             tokenizer_manager, template_manager = init_tokenizer_manager_func(
                 server_args, port_args
             )
@@ -1534,7 +1538,7 @@ class Engine(EngineScoreMixin, EngineBase):
         else:
             return [
                 MultiprocessingSerializer.serialize(tensors)
-                for _ in range(self.server_args.tp_size)
+                for _ in range(get_parallel().tp_size)
             ]
 
     def load_lora_adapter_from_tensors(
@@ -1866,16 +1870,14 @@ def _calculate_rank_ranges(
     return pp_rank_range, tp_rank_range, pp_size_per_node, tp_size_per_node
 
 
-def _compute_parallelism_ranks(
+def _compute_parallelism_ranks(tp_rank: int) -> Tuple[int, int, int]:
-    server_args: ServerArgs, tp_rank: int
-) -> Tuple[int, int, int]:
     """Compute attention-CP, MoE-DP, and MoE-EP ranks for a TP rank.
 
     Called while the launcher is deciding what to spawn, so the sizes are the
     configured ones -- the groups this is laying out do not exist yet.
     """
     attn_dp_size = get_parallel().dp_size if get_parallel().enable_dp_attention else 1
-    tp_size = server_args.tp_size
+    tp_size = get_parallel().tp_size
     attn_cp_size = get_parallel().attn_cp_size
     moe_dp_size = get_parallel().moe_dp_size
 

python/sglang/srt/entrypoints/grpc_server.py

@@ -176,9 +176,9 @@ async def serve_grpc(server_args, model_info=None):
     sidecar_app = web.Application()
     sidecar_runner = None
     sidecar_port = (
-        server_args.smg_http_sidecar_port
+        cfg.smg_http_sidecar_port
-        if server_args.smg_http_sidecar_port is not None
+        if cfg.smg_http_sidecar_port is not None
-        else server_args.port + 1
+        else cfg.port + 1
     )
 
     # Metrics setup: must set PROMETHEUS_MULTIPROC_DIR before scheduler

python/sglang/srt/entrypoints/http_server.py

@@ -251,8 +251,8 @@ async def init_multi_tokenizer() -> ServerArgs:
     template_manager.initialize_templates(
         tokenizer_manager=tokenizer_manager,
         model_path=get_model().model_path,
-        chat_template=server_args.chat_template,
+        chat_template=get_serving().chat_template,
-        completion_template=server_args.completion_template,
+        completion_template=get_serving().completion_template,
     )
 
     tokenizer_manager.max_req_input_len = scheduler_info["max_req_input_len"]
@@ -290,11 +290,11 @@ async def lifespan(fast_api_app: FastAPI):
         enable_func_timer()
 
     # Init tracing
-    if server_args.enable_trace:
+    if get_observability().enable_trace:
         process_tracing_init(
-            server_args.otlp_traces_endpoint,
+            get_observability().otlp_traces_endpoint,
             "sglang",
-            trace_modules=server_args.trace_modules,
+            trace_modules=get_observability().trace_modules,
         )
         if get_disagg().disaggregation_mode == "prefill":
             thread_label = "Prefill" + thread_label
@@ -343,15 +343,15 @@ async def lifespan(fast_api_app: FastAPI):
 
     # Launch tool server
     tool_server = None
-    if server_args.tool_server == "demo":
+    if get_serving().tool_server == "demo":
         from sglang.srt.entrypoints.openai.tool_server import DemoToolServer
 
         tool_server = DemoToolServer()
-    elif server_args.tool_server:
+    elif get_serving().tool_server:
         from sglang.srt.entrypoints.openai.tool_server import MCPToolServer
 
         tool_server = MCPToolServer()
-        await tool_server.add_tool_server(server_args.tool_server)
+        await tool_server.add_tool_server(get_serving().tool_server)
     elif envs.EXA_API_KEY.get():
         from sglang.srt.entrypoints.openai.tool_server import NativeToolServer
 
@@ -381,10 +381,10 @@ async def lifespan(fast_api_app: FastAPI):
         )
 
     # Execute custom warmups
-    if server_args.warmups is not None:
+    if get_serving().warmups is not None:
         await execute_warmups(
             get_disagg().disaggregation_mode,
-            server_args.warmups.split(","),
+            get_serving().warmups.split(","),
             _global_state.tokenizer_manager,
         )
         logger.info("Warmup ended")
@@ -397,7 +397,7 @@ async def lifespan(fast_api_app: FastAPI):
         if (
             getattr(fast_api_app, "is_single_tokenizer_mode", False)
             and get_serving().grpc_port is not None
-            and not (get_serving().smg_grpc_mode or server_args.grpc_mode)
+            and not (get_serving().smg_grpc_mode or get_serving().grpc_mode)
         ):
             grpc_handle = _start_native_grpc_server_for_runtime(
                 server_args=server_args,
@@ -406,7 +406,7 @@ async def lifespan(fast_api_app: FastAPI):
                 scheduler_info=_global_state.scheduler_info,
                 grpc_port=get_serving().grpc_port,
             )
-            if server_args.sidecar is not None:
+            if get_serving().sidecar is not None:
                 from sglang.srt.entrypoints.sidecar import start_sidecar
 
                 sidecar = start_sidecar()
@@ -1101,7 +1101,7 @@ async def attach_hicache_storage_backend(
 
     Only allowed when there are NO running / queued requests.
     """
-    if not _global_state.tokenizer_manager.server_args.admin_api_key:
+    if not get_serving().admin_api_key:
         return _admin_api_key_missing_response()
 
     ret = await _global_state.tokenizer_manager.attach_hicache_storage(
@@ -1133,7 +1133,7 @@ async def detach_hicache_storage_backend():
 
     Only allowed when there are NO running / queued requests.
     """
-    if not _global_state.tokenizer_manager.server_args.admin_api_key:
+    if not get_serving().admin_api_key:
         return _admin_api_key_missing_response()
 
     ret = await _global_state.tokenizer_manager.detach_hicache_storage()
@@ -1157,7 +1157,7 @@ async def detach_hicache_storage_backend():
 @auth_level(AuthLevel.ADMIN_OPTIONAL)
 async def hicache_storage_backend_status():
     """Get current HiCache storage backend status (tokenizer-side view)."""
-    if not _global_state.tokenizer_manager.server_args.admin_api_key:
+    if not get_serving().admin_api_key:
         return _admin_api_key_missing_response()
 
     return {
@@ -2203,8 +2203,8 @@ async def _send_disaggregation_warmup_requests(
 def _execute_server_warmup(server_args: ServerArgs):
     headers = {}
     url = server_args.url()
-    if server_args.api_key:
+    if get_serving().api_key:
-        headers["Authorization"] = f"Bearer {server_args.api_key}"
+        headers["Authorization"] = f"Bearer {get_serving().api_key}"
 
     ssl_verify = ssl_verify_of(server_args)
 
@@ -2235,12 +2235,12 @@ def _execute_server_warmup(server_args: ServerArgs):
     # disaggregation, but its local warmup must stay on the text path.
     is_vlm = (
         bool(model_info.get("has_image_understanding", False))
-        and not server_args.language_only
+        and not get_disagg().language_only
-        and not server_args.language_model_only
+        and not get_disagg().language_model_only
         and not is_mps()
     )
     if model_info["is_generation"]:
-        if is_vlm and not server_args.skip_tokenizer_init:
+        if is_vlm and not get_serving().skip_tokenizer_init:
             request_name = "/v1/chat/completions"
         else:
             request_name = "/generate"
@@ -2253,7 +2253,7 @@ def _execute_server_warmup(server_args: ServerArgs):
             "max_new_tokens": max_new_tokens,
         },
     }
-    if server_args.skip_tokenizer_init:
+    if get_serving().skip_tokenizer_init:
         json_data["input_ids"] = [[10, 11, 12] for _ in range(get_parallel().dp_size)]
         # TODO Workaround the bug that embedding errors for list of size 1
         if get_parallel().dp_size == 1:
@@ -2306,10 +2306,10 @@ def _execute_server_warmup(server_args: ServerArgs):
             json_data["text"] = json_data["text"][0]
 
     # Config debug dumping
-    if server_args.debug_tensor_dump_input_file:
+    if get_observability().debug_tensor_dump_input_file:
         json_data.pop("text", None)
         json_data["input_ids"] = np.load(
-            server_args.debug_tensor_dump_input_file
+            get_observability().debug_tensor_dump_input_file
         ).tolist()
         json_data["sampling_params"]["max_new_tokens"] = 0
 
@@ -2373,7 +2373,7 @@ def _execute_server_warmup(server_args: ServerArgs):
 def _freeze_gc_after_server_warmup(server_args: ServerArgs):
     # Freeze GC after server warmup so static objects skip future GC gen2 collection.
     # Use /freeze_gc to freeze scheduler and detokenizer as well.
-    freeze_key = server_args.admin_api_key or server_args.api_key
+    freeze_key = get_serving().admin_api_key or get_serving().api_key
     freeze_headers = {}
     if freeze_key:
         freeze_headers["Authorization"] = f"Bearer {freeze_key}"
@@ -2394,7 +2394,7 @@ def _wait_and_warmup(
     launch_callback: Optional[Callable[[], None]] = None,
     execute_warmup_func: Callable = _execute_server_warmup,
 ):
-    if server_args.checkpoint_engine_wait_weights_before_ready:
+    if get_model().checkpoint_engine_wait_weights_before_ready:
         _wait_weights_ready()
 
     # Joiner schedulers are served through the primary after adoption.
@@ -2416,10 +2416,10 @@ def _wait_and_warmup(
     # The server is ready for requests
     logger.info("The server is fired up and ready to roll!")
 
-    if server_args.delete_ckpt_after_loading:
+    if get_model().delete_ckpt_after_loading:
         delete_directory(get_model().model_path)
 
-    if server_args.debug_tensor_dump_input_file:
+    if get_observability().debug_tensor_dump_input_file:
         kill_process_tree(os.getpid())
 
     if launch_callback is not None:
@@ -2559,7 +2559,7 @@ def _setup_and_run_http_server(
 
     # Pass additional arguments to the lifespan function.
     # They will be used for additional initialization setups.
-    if server_args.tokenizer_worker_num == 1:
+    if get_serving().tokenizer_worker_num == 1:
         # If it is single tokenizer mode, we can pass the arguments by attributes of the app object.
         app.is_single_tokenizer_mode = True
         app.server_args = server_args
@@ -2577,16 +2577,16 @@ def _setup_and_run_http_server(
         # - no keys: legacy had no restriction; ADMIN_FORCE endpoints must still be rejected when
         #   admin_api_key is not configured.
         if (
-            server_args.api_key
+            get_serving().api_key
-            or server_args.admin_api_key
+            or get_serving().admin_api_key
             or app_has_admin_force_endpoints(app)
         ):
             from sglang.srt.utils.auth import add_api_key_middleware
 
             add_api_key_middleware(
                 app,
-                api_key=server_args.api_key,
+                api_key=get_serving().api_key,
-                admin_api_key=server_args.admin_api_key,
+                admin_api_key=get_serving().admin_api_key,
             )
     else:
         # If it is multi-tokenizer mode, we need to write the arguments to shared memory
@@ -2605,15 +2605,15 @@ def _setup_and_run_http_server(
         # Update logging configs
         set_uvicorn_logging_configs(server_args)
 
-        if server_args.ssl_certfile:
+        if get_serving().ssl_certfile:
             logger.info(
-                f"SSL enabled: certfile={server_args.ssl_certfile}, "
+                f"SSL enabled: certfile={get_serving().ssl_certfile}, "
-                f"keyfile={server_args.ssl_keyfile}"
+                f"keyfile={get_serving().ssl_keyfile}"
             )
 
         # Listen for HTTP requests
-        if server_args.tokenizer_worker_num == 1:
+        if get_serving().tokenizer_worker_num == 1:
-            if server_args.enable_http2:
+            if get_serving().enable_http2:
                 logger.info(
                     f"Starting embedded Granian HTTP/2 server on "
                     f"{get_serving().host}:{get_serving().port}"
@@ -2624,32 +2624,32 @@ def _setup_and_run_http_server(
                     log_level=get_observability().log_level_http
                     or get_observability().log_level,
                     http2_max_concurrent_streams=(
-                        server_args.http2_max_concurrent_streams
+                        get_serving().http2_max_concurrent_streams
                     ),
                     http2_initial_connection_window_size=(
-                        server_args.http2_initial_connection_window_size
+                        get_serving().http2_initial_connection_window_size
                     ),
-                    ssl_certfile=server_args.ssl_certfile,
+                    ssl_certfile=get_serving().ssl_certfile,
-                    ssl_keyfile=server_args.ssl_keyfile,
+                    ssl_keyfile=get_serving().ssl_keyfile,
-                    ssl_ca_certs=server_args.ssl_ca_certs,
+                    ssl_ca_certs=get_serving().ssl_ca_certs,
-                    ssl_keyfile_password=server_args.ssl_keyfile_password,
+                    ssl_keyfile_password=get_serving().ssl_keyfile_password,
                     ssl_verify=False,  # No MTLS supported for now.
                 )
-            elif server_args.enable_ssl_refresh:
+            elif get_serving().enable_ssl_refresh:
                 # Use Config/Server API for access to the SSLContext.
                 config = uvicorn.Config(
                     app,
                     host=get_serving().host,
                     port=get_serving().port,
-                    root_path=server_args.fastapi_root_path,
+                    root_path=get_serving().fastapi_root_path,
                     log_level=get_observability().log_level_http
                     or get_observability().log_level,
                     timeout_keep_alive=envs.SGLANG_TIMEOUT_KEEP_ALIVE.get(),
                     loop="uvloop",
-                    ssl_keyfile=server_args.ssl_keyfile,
+                    ssl_keyfile=get_serving().ssl_keyfile,
-                    ssl_certfile=server_args.ssl_certfile,
+                    ssl_certfile=get_serving().ssl_certfile,
-                    ssl_ca_certs=server_args.ssl_ca_certs,
+                    ssl_ca_certs=get_serving().ssl_ca_certs,
-                    ssl_keyfile_password=server_args.ssl_keyfile_password,
+                    ssl_keyfile_password=get_serving().ssl_keyfile_password,
                 )
                 config.load()  # Creates the SSLContext
 
@@ -2660,9 +2660,9 @@ def _setup_and_run_http_server(
                 async def _run_with_ssl_refresh():
                     refresher = SSLCertRefresher(
                         config.ssl,
-                        server_args.ssl_keyfile,
+                        get_serving().ssl_keyfile,
-                        server_args.ssl_certfile,
+                        get_serving().ssl_certfile,
-                        server_args.ssl_ca_certs,
+                        get_serving().ssl_ca_certs,
                     )
                     logger.info("SSL certificate auto-refresh enabled.")
                     try:
@@ -2679,15 +2679,15 @@ def _setup_and_run_http_server(
                     app,
                     host=get_serving().host,
                     port=get_serving().port,
-                    root_path=server_args.fastapi_root_path,
+                    root_path=get_serving().fastapi_root_path,
                     log_level=get_observability().log_level_http
                     or get_observability().log_level,
                     timeout_keep_alive=envs.SGLANG_TIMEOUT_KEEP_ALIVE.get(),
                     loop="uvloop",
-                    ssl_keyfile=server_args.ssl_keyfile,
+                    ssl_keyfile=get_serving().ssl_keyfile,
-                    ssl_certfile=server_args.ssl_certfile,
+                    ssl_certfile=get_serving().ssl_certfile,
-                    ssl_ca_certs=server_args.ssl_ca_certs,
+                    ssl_ca_certs=get_serving().ssl_ca_certs,
-                    ssl_keyfile_password=server_args.ssl_keyfile_password,
+                    ssl_keyfile_password=get_serving().ssl_keyfile_password,
                 )
         else:
             # Multiple tokenizer and http processes
@@ -2699,14 +2699,14 @@ def _setup_and_run_http_server(
                 "propagate": False,
             }
 
-            if server_args.enable_ssl_refresh:
+            if get_serving().enable_ssl_refresh:
                 logger.warning(
                     "--enable-ssl-refresh is not supported with multiple "
                     "tokenizer workers (--tokenizer-worker-num > 1). "
                     "SSL refresh will be disabled."
                 )
 
-            if server_args.enable_http2:
+            if get_serving().enable_http2:
                 logger.info(
                     f"Starting embedded Granian HTTP/2 server on "
                     f"{get_serving().host}:{get_serving().port}"
@@ -2717,36 +2717,36 @@ def _setup_and_run_http_server(
                     log_level=get_observability().log_level_http
                     or get_observability().log_level,
                     http2_max_concurrent_streams=(
-                        server_args.http2_max_concurrent_streams
+                        get_serving().http2_max_concurrent_streams
                     ),
                     http2_initial_connection_window_size=(
-                        server_args.http2_initial_connection_window_size
+                        get_serving().http2_initial_connection_window_size
                     ),
-                    tokenizer_worker_num=server_args.tokenizer_worker_num,
+                    tokenizer_worker_num=get_serving().tokenizer_worker_num,
-                    ssl_certfile=server_args.ssl_certfile,
+                    ssl_certfile=get_serving().ssl_certfile,
-                    ssl_keyfile=server_args.ssl_keyfile,
+                    ssl_keyfile=get_serving().ssl_keyfile,
-                    ssl_ca_certs=server_args.ssl_ca_certs,
+                    ssl_ca_certs=get_serving().ssl_ca_certs,
-                    ssl_keyfile_password=server_args.ssl_keyfile_password,
+                    ssl_keyfile_password=get_serving().ssl_keyfile_password,
                 )
             else:
                 uvicorn.run(
                     "sglang.srt.entrypoints.http_server:app",
                     host=get_serving().host,
                     port=get_serving().port,
-                    root_path=server_args.fastapi_root_path,
+                    root_path=get_serving().fastapi_root_path,
                     log_level=get_observability().log_level_http
                     or get_observability().log_level,
                     timeout_keep_alive=envs.SGLANG_TIMEOUT_KEEP_ALIVE.get(),
                     timeout_worker_healthcheck=envs.SGLANG_UVICORN_WORKER_HEALTHCHECK_TIMEOUT.get(),
                     loop="uvloop",
-                    workers=server_args.tokenizer_worker_num,
+                    workers=get_serving().tokenizer_worker_num,
-                    ssl_keyfile=server_args.ssl_keyfile,
+                    ssl_keyfile=get_serving().ssl_keyfile,
-                    ssl_certfile=server_args.ssl_certfile,
+                    ssl_certfile=get_serving().ssl_certfile,
-                    ssl_ca_certs=server_args.ssl_ca_certs,
+                    ssl_ca_certs=get_serving().ssl_ca_certs,
-                    ssl_keyfile_password=server_args.ssl_keyfile_password,
+                    ssl_keyfile_password=get_serving().ssl_keyfile_password,
                 )
     finally:
-        if server_args.tokenizer_worker_num > 1:
+        if get_serving().tokenizer_worker_num > 1:
             if multi_tokenizer_args_shm is not None:
                 multi_tokenizer_args_shm.unlink()
             if _global_state is not None:

python/sglang/srt/entrypoints/http_server_engine.py

@@ -5,6 +5,7 @@ from typing import List, Optional, Tuple
 import requests
 import torch
 
+from sglang.srt.arg_groups.overrides import resolving_view
 from sglang.srt.arg_groups.serving_hook import ssl_verify_of
 from sglang.srt.entrypoints.EngineBase import EngineBase
 from sglang.srt.entrypoints.http_server import launch_server
@@ -26,13 +27,16 @@ def launch_server_process(server_args: ServerArgs) -> multiprocessing.Process:
     start_time = time.perf_counter()
 
     ssl_verify = ssl_verify_of(server_args)
+    # The adapter's own configuration, not the bags: this runs in the parent,
+    # and the record it was handed is published only inside the server child.
+    cfg = resolving_view(server_args)
 
     with requests.Session() as session:
         while time.perf_counter() - start_time < timeout:
             try:
                 headers = {
                     "Content-Type": "application/json; charset=utf-8",
-                    "Authorization": f"Bearer {server_args.api_key}",
+                    "Authorization": f"Bearer {cfg.api_key}",
                 }
                 response = session.get(
                     f"{base_url}/health_generate", headers=headers, verify=ssl_verify
@@ -60,9 +64,11 @@ class HttpServerEngineAdapter(EngineBase):
 
     def __init__(self, **kwargs):
         self.server_args = ServerArgs(**kwargs)
-        print(
+        # This process launches the server as a child and never publishes, so
-            f"Launch HttpServerEngineAdapter at: {self.server_args.host}:{self.server_args.port}"
+        # every read here is of the record it just built -- a bag read would
-        )
+        # either fail closed or answer for an unrelated engine in the process.
+        cfg = resolving_view(self.server_args)
+        print(f"Launch HttpServerEngineAdapter at: {cfg.host}:{cfg.port}")
         self.process = launch_server_process(self.server_args)
 
     def _make_request(self, endpoint: str, payload: Optional[dict] = None):
@@ -97,7 +103,7 @@ class HttpServerEngineAdapter(EngineBase):
             {
                 "serialized_named_tensors": [
                     MultiprocessingSerializer.serialize(named_tensors, output_str=True)
-                    for _ in range(self.server_args.tp_size)
+                    for _ in range(resolving_view(self.server_args).tp_size)
                 ],
                 "load_format": load_format,
                 "flush_cache": flush_cache,

python/sglang/srt/entrypoints/openai/realtime/handler.py

@@ -17,6 +17,7 @@ from sglang.srt.entrypoints.openai.transcription_adapters.base import (
     TranscriptionAdapter,
 )
 from sglang.srt.managers.tokenizer_manager import TokenizerManager
+from sglang.srt.runtime_context import get_serving
 from sglang.srt.server_args import ServerArgs
 from sglang.srt.utils import random_uuid
 
@@ -85,7 +86,7 @@ async def handle_realtime_transcription(
             websocket,
             "too_many_sessions",
             f"Maximum concurrent sessions reached "
-            f"({server_args.asr_max_concurrent_sessions}).",
+            f"({get_serving().asr_max_concurrent_sessions}).",
             error_type="rate_limit_exceeded",
         )
         return

python/sglang/srt/entrypoints/openai/realtime/session.py

@@ -72,6 +72,7 @@ from sglang.srt.entrypoints.openai.transcription_adapters.base import (
     TranscriptionAdapter,
 )
 from sglang.srt.managers.tokenizer_manager import TokenizerManager
+from sglang.srt.runtime_context import get_serving
 from sglang.srt.server_args import ServerArgs
 from sglang.srt.utils import random_uuid
 
@@ -186,7 +187,7 @@ class RealtimeConnection:
 
         self.model_sample_rate = adapter.model_sample_rate
         self.bytes_per_second = self.model_sample_rate * _SAMPLE_WIDTH
-        self.max_buffer_seconds = server_args.asr_max_buffer_seconds
+        self.max_buffer_seconds = get_serving().asr_max_buffer_seconds
 
         self.config = _SessionConfig()
 

python/sglang/srt/entrypoints/openai/serving_base.py

@@ -14,6 +14,7 @@ from sglang.srt.entrypoints.openai.encoding_dsv32 import DS32EncodingError
 from sglang.srt.entrypoints.openai.protocol import ErrorResponse, OpenAIServingRequest
 from sglang.srt.managers.io_struct import EmbeddingReqInput, GenerateReqInput
 from sglang.srt.observability.req_time_stats import monotonic_time
+from sglang.srt.runtime_context import get_observability
 from sglang.srt.server_args import ServerArgs
 
 if TYPE_CHECKING:
@@ -29,11 +30,9 @@ class OpenAIServingBase(ABC):
     def __init__(self, tokenizer_manager: TokenizerManager):
         self.tokenizer_manager = tokenizer_manager
         self.allowed_custom_labels = (
-            set(
+            set(get_observability().tokenizer_metrics_allowed_custom_labels)
-                self.tokenizer_manager.server_args.tokenizer_metrics_allowed_custom_labels
-            )
             if isinstance(self.tokenizer_manager.server_args, ServerArgs)
-            and self.tokenizer_manager.server_args.tokenizer_metrics_allowed_custom_labels
+            and get_observability().tokenizer_metrics_allowed_custom_labels
             else None
         )
 
@@ -230,14 +229,12 @@ class OpenAIServingBase(ABC):
     def extract_custom_labels(self, raw_request):
         if (
             not self.allowed_custom_labels
-            or not self.tokenizer_manager.server_args.tokenizer_metrics_custom_labels_header
+            or not get_observability().tokenizer_metrics_custom_labels_header
         ):
             return None
 
         custom_labels = None
-        header = (
+        header = get_observability().tokenizer_metrics_custom_labels_header
-            self.tokenizer_manager.server_args.tokenizer_metrics_custom_labels_header
-        )
         try:
             raw_labels = (
                 orjson.loads(raw_request.headers.get(header))

python/sglang/srt/entrypoints/openai/serving_chat.py

@@ -10,6 +10,8 @@ from enum import Enum
 from http import HTTPStatus
 from typing import TYPE_CHECKING, Any, AsyncGenerator, Dict, List, Optional, Union
 
+from sglang.srt.runtime_context import get_model, get_serving
+
 
 class ThinkingMode(str, Enum):
     """Mode for message encoding - chat vs thinking/reasoning."""
@@ -267,7 +269,7 @@ class OpenAIServingChat(OpenAIServingBase):
         self.tool_call_parser = self.tokenizer_manager.config_value("tool_call_parser")
         self.reasoning_parser = self.tokenizer_manager.config_value("reasoning_parser")
         self.default_chat_template_kwargs = (
-            self.tokenizer_manager.server_args.default_chat_template_kwargs or {}
+            get_serving().default_chat_template_kwargs or {}
         )
         self._reasoning_detector = None
         if self.reasoning_parser:
@@ -317,7 +319,7 @@ class OpenAIServingChat(OpenAIServingBase):
         self._dsv4_reasoning_effort_profile = (
             chat_encoding.resolve_dsv4_reasoning_effort_profile(
                 model_path=self.tokenizer_manager.model_path,
-                revision=self.tokenizer_manager.server_args.revision,
+                revision=get_model().revision,
                 override=self.tokenizer_manager.model_config.hf_config.to_dict().get(
                     chat_encoding.DSV4_REASONING_EFFORT_PROFILE_OVERRIDE
                 ),
@@ -727,7 +729,7 @@ class OpenAIServingChat(OpenAIServingBase):
     def _continuous_usage_cached_details(
         self, content: Dict[str, Any]
     ) -> Optional[PromptTokensDetails]:
-        if not self.tokenizer_manager.server_args.enable_cache_report:
+        if not get_serving().enable_cache_report:
             return None
         return UsageProcessor._details_if_cached(
             content["meta_info"].get("cached_tokens", 0)
@@ -819,7 +821,7 @@ class OpenAIServingChat(OpenAIServingBase):
     ) -> AsyncGenerator[str, None]:
         """Generate SSE chunks for streaming content."""
         offset = stream_offsets.get(index, 0)
-        if self.tokenizer_manager.server_args.incremental_streaming_output:
+        if get_serving().incremental_streaming_output:
             delta = content["text"]
         else:
             delta = content["text"][offset:]
@@ -1007,12 +1009,12 @@ class OpenAIServingChat(OpenAIServingBase):
                 )
 
         max_output_tokens = request.max_completion_tokens or request.max_tokens
-        server_context_length = self.tokenizer_manager.server_args.context_length
+        server_context_length = get_model().context_length
         if (
             max_output_tokens
             and server_context_length
             and max_output_tokens > server_context_length
-        ) and not self.tokenizer_manager.server_args.allow_auto_truncate:
+        ) and not get_serving().allow_auto_truncate:
             return (
                 f"max_completion_tokens is too large: {max_output_tokens}."
                 f"This model supports at most {server_context_length} completion tokens."
@@ -1714,7 +1716,7 @@ class OpenAIServingChat(OpenAIServingBase):
         try:
             include_usage, continuous_usage_stats = should_include_usage(
                 request.stream_options,
-                self.tokenizer_manager.server_args.stream_response_default_include_usage,
+                get_serving().stream_response_default_include_usage,
             )
 
             return_input_ids = self._should_return_input_ids(request)
@@ -1985,7 +1987,7 @@ class OpenAIServingChat(OpenAIServingBase):
                     completion_tokens,
                     cached_tokens=cached_tokens,
                     n_choices=request.n,
-                    enable_cache_report=self.tokenizer_manager.server_args.enable_cache_report,
+                    enable_cache_report=get_serving().enable_cache_report,
                     image_tokens=total_image_tokens,
                     audio_tokens=total_audio_tokens,
                     video_tokens=total_video_tokens,
@@ -2209,7 +2211,7 @@ class OpenAIServingChat(OpenAIServingBase):
         usage = UsageProcessor.calculate_response_usage(
             ret,
             n_choices=request.n,
-            enable_cache_report=self.tokenizer_manager.server_args.enable_cache_report,
+            enable_cache_report=get_serving().enable_cache_report,
             image_tokens=image_tokens,
             audio_tokens=audio_tokens,
             video_tokens=video_tokens,
@@ -2432,7 +2434,7 @@ class OpenAIServingChat(OpenAIServingBase):
         """Process logprobs for streaming response"""
         output_token_logprobs = content["meta_info"]["output_token_logprobs"]
         output_top_logprobs = content["meta_info"].get("output_top_logprobs", [])
-        if not self.tokenizer_manager.server_args.incremental_streaming_output:
+        if not get_serving().incremental_streaming_output:
             output_token_logprobs = output_token_logprobs[
                 n_prev_token:total_output_logprobs
             ]

python/sglang/srt/entrypoints/openai/serving_completions.py

@@ -34,6 +34,7 @@ from sglang.srt.managers.io_struct import GenerateReqInput
 from sglang.srt.parser.code_completion_parser import (
     generate_completion_prompt_from_request,
 )
+from sglang.srt.runtime_context import get_serving
 from sglang.srt.utils.weight_versions import build_endpoint_weight_version_metadata
 from sglang.utils import convert_json_schema_to_str
 
@@ -246,7 +247,7 @@ class OpenAIServingCompletion(OpenAIServingBase):
         try:
             include_usage, continuous_usage_stats = should_include_usage(
                 request.stream_options,
-                self.tokenizer_manager.server_args.stream_response_default_include_usage,
+                get_serving().stream_response_default_include_usage,
             )
 
             async for content in self.tokenizer_manager.generate_request(
@@ -308,7 +309,7 @@ class OpenAIServingCompletion(OpenAIServingBase):
                         output_top_logprobs = content["meta_info"].get(
                             "output_top_logprobs", []
                         )
-                        if not self.tokenizer_manager.server_args.incremental_streaming_output:
+                        if not get_serving().incremental_streaming_output:
                             output_token_logprobs = output_token_logprobs[
                                 n_prev_token:total_output_logprobs
                             ]
@@ -327,7 +328,7 @@ class OpenAIServingCompletion(OpenAIServingBase):
                 chunk_prompt_token_ids = None
                 if request.return_token_ids:
                     output_ids = content["output_ids"]
-                    if not self.tokenizer_manager.server_args.incremental_streaming_output:
+                    if not get_serving().incremental_streaming_output:
                         n_prev_token_id = n_prev_token_ids.get(index, 0)
                         chunk_token_ids = output_ids[n_prev_token_id:]
                         n_prev_token_ids[index] = len(output_ids)
@@ -337,7 +338,7 @@ class OpenAIServingCompletion(OpenAIServingBase):
                         chunk_prompt_token_ids = content.get("prompt_token_ids")
 
                 # Generate delta
-                if self.tokenizer_manager.server_args.incremental_streaming_output:
+                if get_serving().incremental_streaming_output:
                     delta = text
                 else:
                     delta = text[offset:]
@@ -475,7 +476,7 @@ class OpenAIServingCompletion(OpenAIServingBase):
                     completion_tokens,
                     cached_tokens=cached_tokens,
                     n_choices=request.n,
-                    enable_cache_report=self.tokenizer_manager.server_args.enable_cache_report,
+                    enable_cache_report=get_serving().enable_cache_report,
                 )
                 final_usage_chunk = CompletionStreamResponse(
                     id=content["meta_info"]["id"],
@@ -620,7 +621,7 @@ class OpenAIServingCompletion(OpenAIServingBase):
             choices.append(choice_data)
 
         # Calculate usage
-        cache_report = self.tokenizer_manager.server_args.enable_cache_report
+        cache_report = get_serving().enable_cache_report
         usage = UsageProcessor.calculate_response_usage(
             ret, n_choices=request.n, enable_cache_report=cache_report
         )

python/sglang/srt/entrypoints/openai/serving_responses.py

@@ -73,6 +73,7 @@ from sglang.srt.function_call.function_call_parser import FunctionCallParser
 from sglang.srt.function_call.json_array_parser import JsonArrayParser
 from sglang.srt.managers.io_struct import GenerateReqInput
 from sglang.srt.parser.reasoning_parser import ReasoningParser
+from sglang.srt.runtime_context import get_serving
 from sglang.srt.sampling.sampling_params import (
     set_request_reasoning_end_token_ids,
 )
@@ -2031,7 +2032,7 @@ class OpenAIServingResponses(OpenAIServingChat):
         finish_reason: Optional[dict[str, Any]] = None
         flushed = False
         stream_offset = 0
-        incremental = self.tokenizer_manager.server_args.incremental_streaming_output
+        incremental = get_serving().incremental_streaming_output
 
         def _open_reasoning_item() -> str:
             nonlocal current_output_index

python/sglang/srt/entrypoints/openai/serving_transcription.py

@@ -55,6 +55,7 @@ from sglang.srt.entrypoints.openai.streaming_asr import (
 )
 from sglang.srt.entrypoints.openai.transcription_adapters import resolve_adapter
 from sglang.srt.managers.io_struct import GenerateReqInput
+from sglang.srt.runtime_context import get_serving
 
 if TYPE_CHECKING:
     from sglang.srt.managers.tokenizer_manager import TokenizerManager
@@ -74,7 +75,7 @@ class OpenAIServingTranscription(OpenAIServingBase):
         # Cap concurrent /v1/realtime sessions. The Semaphore is bound to the
         # event loop on first acquire (uvicorn's loop in normal serving).
         self._session_semaphore = asyncio.Semaphore(
-            tokenizer_manager.server_args.asr_max_concurrent_sessions
+            get_serving().asr_max_concurrent_sessions
         )
 
     def _request_id_prefix(self) -> str:
@@ -498,11 +499,7 @@ class OpenAIServingTranscription(OpenAIServingBase):
         # the cumulative text. Always reconstruct cumulative text locally
         # so the rest of the loop (prefix parse + visible-buffer slice)
         # works uniformly under either mode.
-        incremental = getattr(
+        incremental = get_serving().incremental_streaming_output
-            self.tokenizer_manager.server_args,
-            "incremental_streaming_output",
-            False,
-        )
         cumulative_text = ""
 
         try:
@@ -613,11 +610,7 @@ class OpenAIServingTranscription(OpenAIServingBase):
         model = request.model
         fused_mode = getattr(request, "_fused_autodetect", False)
         ts_variant = getattr(request, "_fused_ts_variant", False)
-        incremental = getattr(
+        incremental = get_serving().incremental_streaming_output
-            self.tokenizer_manager.server_args,
-            "incremental_streaming_output",
-            False,
-        )
 
         def _frame(delta: Optional[str], finish_reason: Optional[str] = None) -> str:
             chunk = TranscriptionStreamResponse(

python/sglang/srt/kv_canary/config.py

@@ -8,6 +8,7 @@ from sglang.kernels.ops.kv_canary.consts import (
     RealKvHashMode,
 )
 from sglang.srt.environ import envs
+from sglang.srt.runtime_context import get_observability
 
 if TYPE_CHECKING:
     from sglang.srt.server_args import ServerArgs
@@ -61,18 +62,18 @@ class CanaryConfig:
 
     @classmethod
     def from_env(cls, server_args: ServerArgs) -> CanaryConfig:
-        mode_raw = server_args.kv_canary.strip().lower()
+        mode_raw = get_observability().kv_canary.strip().lower()
         if mode_raw not in ("none", "log", "raise"):
             raise ValueError(
                 f"kv-canary: kv_canary must be one of none/log/raise, got {mode_raw!r}"
             )
 
-        real_kv_raw = server_args.kv_canary_real_data.strip().upper()
+        real_kv_raw = get_observability().kv_canary_real_data.strip().upper()
 
         return cls(
             mode=CanaryMode(mode_raw),
             ring_capacity=envs.SGLANG_KV_CANARY_RING_CAPACITY.get(),
-            sweep_interval=server_args.kv_canary_sweep_interval,
+            sweep_interval=get_observability().kv_canary_sweep_interval,
             real_kv_hash_mode=RealKvHashMode[real_kv_raw],
             enable_write_input_assert=envs.SGLANG_KV_CANARY_ENABLE_WRITE_INPUT_ASSERT.get(),
             enable_verify_token_assert=envs.SGLANG_KV_CANARY_ENABLE_VERIFY_TOKEN_ASSERT.get(),

python/sglang/srt/layers/attention/deepseek_v4_backend_hip_radix.py

@@ -37,6 +37,7 @@ from sglang.srt.layers.attention.dsv4.metadata import (
 from sglang.srt.mem_cache.deepseek_v4_memory_pool import DeepSeekV4TokenToKVPool
 from sglang.srt.model_executor.forward_batch_info import ForwardBatch, ForwardMode
 from sglang.srt.runtime_context import (
+    get_exec,
     get_parallel,
     get_spec,
 )
@@ -474,7 +475,7 @@ class DeepseekV4HipRadixBackend(
             model_runner.model_config.hf_text_config, "index_topk", C4_TOPK
         )
         self.enable_deepseek_v4_fp4_indexer: bool = (
-            model_runner.server_args.enable_deepseek_v4_fp4_indexer
+            get_exec().kernel.enable_deepseek_v4_fp4_indexer
         )
         self.topk = get_spec().speculative_eagle_topk or 0
         assert self.topk in [0, 1], "MTP Topk > 1 not supported for DeepSeek V4"

python/sglang/srt/layers/attention/flashinfer_backend.py

@@ -314,7 +314,7 @@ class FlashInferAttnBackend(AttentionBackend):
             model_runner
         )
         self.use_sliding_window_kv_pool = self._swa_kv_pool is not None
-        self.enable_mis = model_runner.server_args.enable_mis
+        self.enable_mis = get_exec().features.enable_mis
 
         # FIXME: remove dllm workarounds from flashinfer
         self.dllm_config = DllmConfig.from_server_args(model_runner.server_args)

python/sglang/srt/layers/attention/hybrid_linear_attn_backend.py

@@ -64,7 +64,7 @@ class MambaAttnBackendBase(AttentionBackend):
         self.is_draft_worker = model_runner.is_draft_worker
         self.req_to_token_pool: HybridReqToTokenPool = model_runner.req_to_token_pool
         self.token_to_kv_pool = model_runner.token_to_kv_pool
-        self.enable_unified_memory = model_runner.server_args.enable_unified_memory
+        self.enable_unified_memory = get_memory().enable_unified_memory
         # model_config must not be touched here: backend selection reads the
         # linear_attn_backends stamp first, and that guard test constructs
         # backends on runners without a real model_config.
@@ -933,10 +933,8 @@ class Mamba2AttnBackend(MambaAttnBackendBase):
             assert self.conv_states_shape[-1] < self.mamba_chunk_size, (
                 f"{self.conv_states_shape[-1]=} should be less than {self.mamba_chunk_size}"
             )
-            assert (
+            assert get_exec().mamba.mamba_track_interval >= self.mamba_chunk_size, (
-                model_runner.server_args.mamba_track_interval >= self.mamba_chunk_size
+                f"mamba_track_interval ({get_exec().mamba.mamba_track_interval}) must be >= mamba_chunk_size ({self.mamba_chunk_size})"
-            ), (
-                f"mamba_track_interval ({model_runner.server_args.mamba_track_interval}) must be >= mamba_chunk_size ({self.mamba_chunk_size})"
             )
 
     def init_forward_metadata_out_graph(

python/sglang/srt/layers/attention/minicpm/backend.py

@@ -18,6 +18,7 @@ from sglang.srt.layers.attention.minicpm.attention_adapter import (
 from sglang.srt.layers.attention.minicpm.cache import attach_compressed_cache
 from sglang.srt.model_executor.forward_batch_info import ForwardBatch
 from sglang.srt.runtime_context import (
+    get_exec,
     get_parallel,
     get_platform,
     get_schedule,
@@ -189,7 +190,7 @@ class MiniCPMSparseBackend(AttentionBackend):
             model_runner.token_to_kv_pool_allocator,
             kernel_size=self.kernel_size,
             kernel_stride=self.kernel_stride,
-            enable_memory_saver=model_runner.server_args.enable_memory_saver,
+            enable_memory_saver=get_exec().features.enable_memory_saver,
         )
         self.req_to_sparse_k1_token = self.req_to_token_pool.req_to_sparse_k1_token
         self.req_to_sparse_k2_token = self.req_to_token_pool.req_to_sparse_k2_token

python/sglang/srt/layers/attention/triton_backend.py

@@ -175,7 +175,7 @@ class TritonAttnBackend(AttentionBackend):
         self.decode_attention_fwd = torch.compiler.disable(decode_attention_fwd)
         # Work-Centric (Lean) Attention activation. None => auto-gate from host-side
         # seqlen metadata in forward_decode; True/False => explicit override.
-        self.enable_lean_attention = model_runner.server_args.enable_lean_attention
+        self.enable_lean_attention = get_exec().kernel.enable_lean_attention
         self._lean_decode_seqlen_gate = lean_decode_seqlen_gate
         self._lean_capture_policy = lean_capture_policy
         self.extend_attention_fwd = torch.compiler.disable(extend_attention_fwd)
@@ -333,9 +333,7 @@ class TritonAttnBackend(AttentionBackend):
             )
             self.static_kv_splits = False
         else:
-            self.split_tile_size = (
+            self.split_tile_size = get_exec().kernel.triton_attention_split_tile_size
-                model_runner.server_args.triton_attention_split_tile_size
-            )
 
         if self.split_tile_size is not None:
             self.max_kv_splits = (

python/sglang/srt/layers/layernorm_sp.py

@@ -40,7 +40,11 @@ from typing import Optional
 import torch
 
 from sglang.srt.distributed import get_tp_group
-from sglang.srt.runtime_context import get_flags, get_forward
+from sglang.srt.runtime_context import (
+    get_flags,
+    get_forward,
+    get_parallel,
+)
 from sglang.srt.utils.common import ceil_align
 
 # Architectures whose decoder layers route attention/MLP through
@@ -50,12 +54,12 @@ from sglang.srt.utils.common import ceil_align
 SP_SUPPORTED_ARCHITECTURES = frozenset({"Qwen3ForCausalLM"})
 
 
-def initialize_layernorm_sp(*, server_args, model_config) -> None:
+def initialize_layernorm_sp(*, model_config) -> None:
     """Materialize ``flags.sp.enabled``; runs once per worker after distributed
     setup, alongside ``initialize_dp_attention``."""
     architectures = model_config.hf_config.architectures
     get_flags().sp.enabled = bool(
-        server_args.enable_layernorm_sp
+        get_parallel().enable_layernorm_sp
         and architectures
         and architectures[0] in SP_SUPPORTED_ARCHITECTURES
     )

python/sglang/srt/layers/moe/dwdp/dwdp_manager.py

@@ -33,7 +33,7 @@ _EXPERT_WEIGHT_NAMES = (
 
 class DwdpManager:
     def __init__(self, server_args: ServerArgs):
-        self.dwdp_size = server_args.dwdp_size
+        self.dwdp_size = get_parallel().dwdp_size
         self.dwdp_rank = get_parallel().tp_rank
         self.device_id = torch.cuda.current_device()
         self.layout: Optional[DwdpExpertLayout] = None

python/sglang/srt/layers/moe/qwen35_flashinfer_fusion.py

@@ -8,7 +8,7 @@ from typing import Optional
 
 import torch
 
-from sglang.srt.arg_groups.overrides import cutedsl_moe_max_num_tokens, resolving_view
+from sglang.srt.arg_groups.overrides import cutedsl_moe_max_num_tokens
 from sglang.srt.layers.communicator import (
     CommunicateWithAllReduceAndLayerNormFn,
     LayerCommunicator,
@@ -18,7 +18,11 @@ from sglang.srt.layers.communicator import (
 from sglang.srt.layers.dp_attention import is_dp_attention_enabled
 from sglang.srt.layers.moe import get_moe_a2a_backend
 from sglang.srt.model_executor.forward_batch_info import ForwardBatch, ForwardMode
-from sglang.srt.runtime_context import get_exec, get_parallel
+from sglang.srt.runtime_context import (
+    get_disagg,
+    get_exec,
+    get_parallel,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -33,9 +37,8 @@ def is_supported_forward_mode(forward_mode: ForwardMode) -> bool:
 
 def resolve_max_m(model_runner) -> int:
     """Use framework token bounds as the workspace-capacity source of truth."""
-    server_args = resolving_view(model_runner.server_args)
+    decode_config = get_exec().graph.cuda_graph_config.decode
-    decode_config = server_args.cuda_graph_config.decode
+    prefill_config = get_exec().graph.cuda_graph_config.prefill
-    prefill_config = server_args.cuda_graph_config.prefill
     candidates = [
         cutedsl_moe_max_num_tokens(model_runner.server_args),
         model_runner.max_running_requests,
@@ -335,7 +338,7 @@ def prepare_qwen35_flashinfer_fusion(model, model_runner) -> None:
     service = getattr(model, "flashinfer_mnnvl_cutedsl_fusion", None)
     if service is None:
         return
-    if model_runner.server_args.enable_pdmux:
+    if get_disagg().enable_pdmux:
         raise RuntimeError(
             "FlashInfer MNNVL CuTe DSL fusion does not support concurrent PDMux "
             "streams sharing one mutable workspace"

python/sglang/srt/layers/quantization/unquant.py

@@ -56,7 +56,6 @@ if TYPE_CHECKING:
         DispatchOutput,
         StandardDispatchOutput,
     )
-    from sglang.srt.server_args import ServerArgs
 
 from sglang.srt.hardware_backend.npu.quantization.moe_methods import (
     NPUUnquantMoEMethod,
@@ -152,7 +151,7 @@ def should_enable_bf16_splitk_gemm(backend: Bf16GemmBackend) -> bool:
     return backend.is_optimized() and envs.SGLANG_ENABLE_BF16_SPLITK_GEMM.get()
 
 
-def initialize_bf16_gemm_config(server_args: ServerArgs) -> None:
+def initialize_bf16_gemm_config() -> None:
     global _BF16_GEMM_BACKEND
     global _cutedsl_bf16_gemm, _use_cutedsl_bf16_gemm
     global _flashinfer_pr4266_splitk_tactic
@@ -162,7 +161,7 @@ def initialize_bf16_gemm_config(server_args: ServerArgs) -> None:
     global _flashinfer_pr4266_run_direct_dense
     global _enable_bf16_splitk_gemm
 
-    backend_str = server_args.bf16_gemm_backend
+    backend_str = get_exec().kernel.bf16_gemm_backend
     if backend_str == "auto" and get_platform().is_sm100:
         backend_str = (
             "torch"

python/sglang/srt/lora/backend/chunked_backend.py

@@ -17,6 +17,7 @@ from sglang.srt.lora.utils import (
     merge_and_chunk_segments,
 )
 from sglang.srt.model_executor.forward_batch_info import ForwardBatch
+from sglang.srt.runtime_context import get_lora
 from sglang.srt.server_args import ServerArgs
 
 MIN_CHUNK_SIZE = 16
@@ -42,7 +43,7 @@ class ChunkedSgmvLoRABackend(BaseLoRABackend):
         server_args: ServerArgs,
     ):
         super().__init__(max_loras_per_batch, device)
-        self.max_chunk_size = server_args.max_lora_chunk_size
+        self.max_chunk_size = get_lora().max_lora_chunk_size
 
     def run_lora_a_embedding(
         self,

python/sglang/srt/managers/data_parallel_controller.py

@@ -19,8 +19,8 @@ import multiprocessing as mp
 import signal
 import threading
 import time
+from collections.abc import Callable
 from enum import Enum, auto
-from typing import Callable, List, Optional
 
 import psutil
 import setproctitle
@@ -53,7 +53,9 @@ from sglang.srt.runtime_context import (
     get_device,
     get_disagg,
     get_exec,
+    get_observability,
     get_parallel,
+    get_serving,
     publish,
 )
 from sglang.srt.server_args import (
@@ -154,7 +156,7 @@ class DataParallelController:
 
         # Init inter-process communication
         self.context = zmq.Context(1 + get_parallel().dp_size)
-        if server_args.node_rank == 0:
+        if get_parallel().node_rank == 0:
             self.recv_from_tokenizer = get_zmq_socket(
                 self.context, zmq.PULL, port_args.scheduler_input_ipc_name, False
             )
@@ -174,13 +176,13 @@ class DataParallelController:
         )
 
         self.launch_dp_size: int = get_parallel().dp_size
-        self.max_dp_size: int = server_args.max_ep_size or get_parallel().dp_size
+        self.max_dp_size: int = get_parallel().max_ep_size or get_parallel().dp_size
         assert self.max_dp_size >= self.launch_dp_size, (
             f"--max-ep-size ({self.max_dp_size}) must be >= "
             f"--dp ({self.launch_dp_size})."
         )
 
-        self.dp_active: List[bool] = [True] * self.launch_dp_size + [False] * (
+        self.dp_active: list[bool] = [True] * self.launch_dp_size + [False] * (
             self.max_dp_size - self.launch_dp_size
         )
 
@@ -196,9 +198,9 @@ class DataParallelController:
 
         # Launch data parallel workers
         self.scheduler_procs = []
-        self.workers: List[Optional[zmq.Socket]] = [None] * self.max_dp_size
+        self.workers: list[zmq.Socket | None] = [None] * self.max_dp_size
-        self.status: List[bool] = list(self.dp_active)
+        self.status: list[bool] = list(self.dp_active)
-        self._active_workers: List[int] = list(range(self.launch_dp_size))
+        self._active_workers: list[int] = list(range(self.launch_dp_size))
         self._active_count_cache: int = self.launch_dp_size
 
         if get_parallel().enable_dp_attention:
@@ -209,7 +211,7 @@ class DataParallelController:
             # Otherwise fall back to the original behaviour: send to only the
             # first leader, which then broadcasts over the full tp_group.
             local_ctrl = get_parallel().enable_dp_attention_local_control_broadcast
-            self.control_message_step = 1 if local_ctrl else server_args.tp_size
+            self.control_message_step = 1 if local_ctrl else get_parallel().tp_size
         else:
             self.launch_dp_schedulers(server_args, port_args)
             self.control_message_step = 1
@@ -223,7 +225,7 @@ class DataParallelController:
             test_stuck_time=envs.SGLANG_TEST_STUCK_DP_CONTROLLER.get(),
         )
 
-        if server_args.enable_metrics:
+        if get_observability().enable_metrics:
             start_cpu_monitor_thread("data_parallel_controller")
 
     def send_to_all_workers(self, obj):
@@ -392,10 +394,12 @@ class DataParallelController:
             )
             threads.append(thread)
             base_gpu_id += (
-                server_args.tp_size * get_parallel().pp_size * server_args.gpu_id_step
+                get_parallel().tp_size
+                * get_parallel().pp_size
+                * get_device().gpu_id_step
             )
 
-            if server_args.node_rank == 0:
+            if get_parallel().node_rank == 0:
                 self.workers[dp_rank] = get_zmq_socket(
                     self.context,
                     zmq.PUSH,
@@ -430,8 +434,8 @@ class DataParallelController:
             time.sleep(30 * 24 * 3600)
 
     def _broadcast_worker_ports(
-        self, server_args: ServerArgs, worker_ports: Optional[List[int]] = None
+        self, server_args: ServerArgs, worker_ports: list[int] | None = None
-    ) -> List[int]:
+    ) -> list[int]:
         """Broadcast worker ports from node 0 to all other nodes.
 
         Node 0 acts as the server, waiting for all other nodes to connect and
@@ -446,28 +450,28 @@ class DataParallelController:
             List of worker ports (same on all nodes after broadcast).
         """
         is_joiner = server_args.is_ep_scale_joiner
-        if server_args.dist_init_addr is None or is_joiner:
+        if get_parallel().dist_init_addr is None or is_joiner:
             na = NetworkAddress(
-                server_args.host or "127.0.0.1",
+                get_serving().host or "127.0.0.1",
-                server_args.port + DP_ATTENTION_HANDSHAKE_PORT_DELTA,
+                get_serving().port + DP_ATTENTION_HANDSHAKE_PORT_DELTA,
             )
         else:
-            na = NetworkAddress.parse(server_args.dist_init_addr)
+            na = NetworkAddress.parse(get_parallel().dist_init_addr)
             na = NetworkAddress(na.host, na.port + DP_ATTENTION_HANDSHAKE_PORT_DELTA)
         endpoint = na.to_tcp()
 
-        if server_args.node_rank == 0:
+        if get_parallel().node_rank == 0:
             # Node 0: Broadcast worker ports to all other nodes
             return self._broadcast_ports_as_server(
-                endpoint, server_args.nnodes - 1, worker_ports
+                endpoint, get_parallel().nnodes - 1, worker_ports
             )
         else:
             # Other nodes: Receive worker ports from node 0
-            return self._receive_ports_as_client(endpoint, server_args.node_rank)
+            return self._receive_ports_as_client(endpoint, get_parallel().node_rank)
 
     def _broadcast_ports_as_server(
-        self, endpoint: str, expected_clients: int, worker_ports: List[int]
+        self, endpoint: str, expected_clients: int, worker_ports: list[int]
-    ) -> List[int]:
+    ) -> list[int]:
         """Broadcast worker ports to all client nodes."""
         logger.debug(f"Broadcasting worker ports to {expected_clients} client nodes")
         logger.debug(f"Worker ports: {worker_ports}")
@@ -500,7 +504,7 @@ class DataParallelController:
                     daemon=True,
                 ).start()
 
-    def _reply_ports_as_server(self, rep_socket: zmq.Socket, worker_ports: List[int]):
+    def _reply_ports_as_server(self, rep_socket: zmq.Socket, worker_ports: list[int]):
         """Background thread: serve the pre-bound worker-port list to
         late-arriving elastic joiners. Publishes port numbers only; the primary
         keeps ownership of every socket."""
@@ -518,9 +522,9 @@ class DataParallelController:
             sock_send(rep_socket, wrap_as_pickle(worker_ports))
             logger.debug(f"Sent worker ports to node {client_rank}")
 
-    def _receive_ports_as_client(self, endpoint: str, node_rank: int) -> List[int]:
+    def _receive_ports_as_client(self, endpoint: str, node_rank: int) -> list[int]:
         """Receive worker ports from the server node."""
-        logger.debug(f"Connecting to node 0 to receive worker ports")
+        logger.debug("Connecting to node 0 to receive worker ports")
 
         req_socket = get_zmq_socket(self.context, zmq.REQ, endpoint, False)
         req_socket.setsockopt(zmq.RCVTIMEO, 600 * 1000)  # 10 minute timeout
@@ -543,37 +547,37 @@ class DataParallelController:
             req_socket.close()
 
     def _joiner_local_tp_span(self, server_args: ServerArgs) -> int:
-        return server_args.tp_size
+        return get_parallel().tp_size
 
     def _joiner_slot_offset(self, server_args: ServerArgs) -> int:
-        return server_args.ep_join_rank_offset
+        return get_parallel().ep_join_rank_offset
 
     def launch_dp_attention_schedulers(
         self, server_args: ServerArgs, port_args: PortArgs
     ):
-        if server_args.dist_init_addr is None:
+        if get_parallel().dist_init_addr is None:
             bind_host = "127.0.0.1"
         else:
-            bind_host = NetworkAddress.parse(server_args.dist_init_addr).host
+            bind_host = NetworkAddress.parse(get_parallel().dist_init_addr).host
 
         worker_ports = []
         if server_args.is_ep_scale_joiner:
             # Scale joiners connect to their pre-bound primary worker sockets.
-            primary = NetworkAddress.parse(server_args.dist_init_addr)
+            primary = NetworkAddress.parse(get_parallel().dist_init_addr)
             primary_endpoint = NetworkAddress(
                 primary.host, primary.port + DP_ATTENTION_HANDSHAKE_PORT_DELTA
             ).to_tcp()
             all_ports = self._receive_ports_as_client(
-                primary_endpoint, server_args.node_rank
+                primary_endpoint, get_parallel().node_rank
             )
             offset = self._joiner_slot_offset(server_args)
             local_tp_span = self._joiner_local_tp_span(server_args)
             broadcasted_ports = all_ports[offset : offset + local_tp_span]
-        elif server_args.node_rank == 0:
+        elif get_parallel().node_rank == 0:
             # Elastic primaries reserve sockets for the maximum DP size.
             bind_count = (
                 self.max_dp_size
-                if server_args.elastic_ep_backend is not None
+                if get_exec().moe.elastic_ep_backend is not None
                 else get_parallel().dp_size
             )
             for slot in range(bind_count):
@@ -601,35 +605,35 @@ class DataParallelController:
         server_args: ServerArgs,
         port_args: PortArgs,
         base_gpu_id: int,
-        dp_rank: Optional[int],
+        dp_rank: int | None,
-        worker_ports: Optional[List[int]] = None,
+        worker_ports: list[int] | None = None,
     ):
         if not get_parallel().enable_dp_attention:
             logger.info(f"Launch DP{dp_rank} starting at GPU #{base_gpu_id}.")
 
         memory_saver_adapter = TorchMemorySaverAdapter.create(
-            enable=server_args.enable_memory_saver
+            enable=get_exec().features.enable_memory_saver
         )
 
         scheduler_pipe_readers = []
 
-        pp_size_per_node = max(get_parallel().pp_size // server_args.nnodes, 1)
+        pp_size_per_node = max(get_parallel().pp_size // get_parallel().nnodes, 1)
-        nnodes_per_pp_rank = max(server_args.nnodes // get_parallel().pp_size, 1)
+        nnodes_per_pp_rank = max(get_parallel().nnodes // get_parallel().pp_size, 1)
         pp_rank_range = range(
-            pp_size_per_node * (server_args.node_rank // nnodes_per_pp_rank),
+            pp_size_per_node * (get_parallel().node_rank // nnodes_per_pp_rank),
-            pp_size_per_node * (server_args.node_rank // nnodes_per_pp_rank + 1),
+            pp_size_per_node * (get_parallel().node_rank // nnodes_per_pp_rank + 1),
         )
 
         nnodes_per_tp_group = nnodes_per_pp_rank
-        tp_size_per_node = server_args.tp_size // nnodes_per_tp_group
+        tp_size_per_node = get_parallel().tp_size // nnodes_per_tp_group
         if server_args.is_ep_scale_joiner:
             # Scale joiners enumerate their full local TP span.
-            tp_rank_range = range(server_args.tp_size)
+            tp_rank_range = range(get_parallel().tp_size)
-            tp_size_per_node = server_args.tp_size
+            tp_size_per_node = get_parallel().tp_size
         else:
             tp_rank_range = range(
-                tp_size_per_node * (server_args.node_rank % nnodes_per_tp_group),
+                tp_size_per_node * (get_parallel().node_rank % nnodes_per_tp_group),
-                tp_size_per_node * (server_args.node_rank % nnodes_per_tp_group + 1),
+                tp_size_per_node * (get_parallel().node_rank % nnodes_per_tp_group + 1),
             )
 
         attn_cp_rank = 0
@@ -643,7 +647,7 @@ class DataParallelController:
                     _, _, dp_rank, _ = compute_dp_attention_world_info(
                         get_parallel().enable_dp_attention,
                         tp_rank,
-                        server_args.tp_size,
+                        get_parallel().tp_size,
                         get_parallel().dp_size,
                         get_parallel().attn_cp_size,
                     )
@@ -653,7 +657,9 @@ class DataParallelController:
                     )
                     if server_args.is_ep_scale_joiner:
                         # Scale-joiner outputs return through the primary tokenizer.
-                        primary_addr = NetworkAddress.parse(server_args.dist_init_addr)
+                        primary_addr = NetworkAddress.parse(
+                            get_parallel().dist_init_addr
+                        )
                         primary_port_base = primary_addr.port + 1
                         rank_port_args.tokenizer_ipc_name = NetworkAddress(
                             primary_addr.host, primary_port_base
@@ -668,10 +674,10 @@ class DataParallelController:
 
                 reader, writer = mp.Pipe(duplex=False)
                 gpu_id = (
-                    server_args.base_gpu_id
+                    get_device().base_gpu_id
                     + base_gpu_id
                     + ((pp_rank % pp_size_per_node) * tp_size_per_node)
-                    + (tp_rank % tp_size_per_node) * server_args.gpu_id_step
+                    + (tp_rank % tp_size_per_node) * get_device().gpu_id_step
                 )
                 attn_dp_size = (
                     get_parallel().dp_size if get_parallel().enable_dp_attention else 1
@@ -681,24 +687,26 @@ class DataParallelController:
                 # - Attention: Global(TP) -> DP -> ATTN_CP -> ATTN_TP (innermost)
                 # - MoE: Global(TP) -> MOE_DP -> EP -> MOE_TP (innermost)
                 attn_tp_size = (
-                    server_args.tp_size // attn_dp_size // get_parallel().attn_cp_size
+                    get_parallel().tp_size
+                    // attn_dp_size
+                    // get_parallel().attn_cp_size
                 )
                 attn_cp_rank = (tp_rank // attn_tp_size) % get_parallel().attn_cp_size
                 moe_dp_rank = tp_rank // (
-                    server_args.tp_size // get_parallel().moe_dp_size
+                    get_parallel().tp_size // get_parallel().moe_dp_size
                 )
                 moe_ep_rank = (
                     tp_rank
-                    % (server_args.tp_size // get_parallel().moe_dp_size)
+                    % (get_parallel().tp_size // get_parallel().moe_dp_size)
                     // (
-                        server_args.tp_size
+                        get_parallel().tp_size
                         // get_parallel().moe_dp_size
                         // get_parallel().ep_size
                     )
                 )
 
                 # Scheduler internals use local ranks; logs use global ranks.
-                offset = server_args.ep_join_rank_offset
+                offset = get_parallel().ep_join_rank_offset
                 display_tp_rank = tp_rank + offset
                 display_moe_ep_rank = moe_ep_rank + offset
                 display_dp_rank = dp_rank + offset if dp_rank is not None else None
@@ -828,11 +836,11 @@ def run_data_parallel_controller_process(
     # This process reads the config namespaces before spawning schedulers.
     publish(server_args, role="dp_controller")
     configure_logger(server_args)
-    if server_args.enable_trace:
+    if get_observability().enable_trace:
         process_tracing_init(
-            server_args.otlp_traces_endpoint,
+            get_observability().otlp_traces_endpoint,
             "sglang",
-            trace_modules=server_args.trace_modules,
+            trace_modules=get_observability().trace_modules,
         )
         thread_label = "DP Controller"
         if get_disagg().disaggregation_mode == "prefill":
@@ -858,7 +866,7 @@ def run_data_parallel_controller_process(
             }
         )
         # The primary owns routing for the expanded scheduler set.
-        if server_args.node_rank == 0 and not server_args.is_ep_scale_joiner:
+        if get_parallel().node_rank == 0 and not server_args.is_ep_scale_joiner:
             controller.event_loop()
         for proc in controller.scheduler_procs:
             proc.join()

python/sglang/srt/managers/detokenizer_manager.py

@@ -127,22 +127,22 @@ class DetokenizerManager(MultiHttpWorkerDetokenizerMixin):
         # In multi-tokenizer mode, results are pushed back to each TokenizerWorker
         # directly via SocketMapping inside multi_http_worker_event_loop, so the
         # single send_to_tokenizer socket is unused.
-        if server_args.tokenizer_worker_num == 1:
+        if get_serving().tokenizer_worker_num == 1:
             self.send_to_tokenizer = get_zmq_socket(
                 context, zmq.PUSH, port_args.tokenizer_ipc_name, False
             )
 
     def init_tokenizer(self, server_args: ServerArgs):
-        if server_args.skip_tokenizer_init:
+        if get_serving().skip_tokenizer_init:
             self.tokenizer = None
             self.vocab_size = None
         else:
             self.tokenizer = get_tokenizer(
                 get_serving().tokenizer_path,
-                tokenizer_mode=server_args.tokenizer_mode,
+                tokenizer_mode=get_serving().tokenizer_mode,
                 trust_remote_code=get_model().trust_remote_code,
-                revision=server_args.revision,
+                revision=get_model().revision,
-                tokenizer_backend=server_args.tokenizer_backend,
+                tokenizer_backend=get_serving().tokenizer_backend,
             )
             try:
                 self.vocab_size = len(self.tokenizer)
@@ -151,7 +151,9 @@ class DetokenizerManager(MultiHttpWorkerDetokenizerMixin):
 
     def init_running_status(self, server_args: ServerArgs):
         self.decode_status = LimitedCapacityDict(capacity=DETOKENIZER_MAX_STATES)
-        self.disable_tokenizer_batch_decode = server_args.disable_tokenizer_batch_decode
+        self.disable_tokenizer_batch_decode = (
+            get_serving().disable_tokenizer_batch_decode
+        )
         self.is_tool_call_parser_gpt_oss = get_serving().tool_call_parser == "gpt-oss"
 
         self.soft_watchdog = Watchdog.create(
@@ -548,7 +550,7 @@ def run_detokenizer_process(
     manager = None
     try:
         manager = detokenizer_manager_class(server_args, port_args)
-        if server_args.tokenizer_worker_num == 1:
+        if get_serving().tokenizer_worker_num == 1:
             manager.event_loop()
         else:
             manager.multi_http_worker_event_loop()

python/sglang/srt/managers/multimodal_processor.py

@@ -6,6 +6,7 @@ import pkgutil
 
 from sglang.srt.configs.model_config import ModelImpl
 from sglang.srt.multimodal.processors.base_processor import BaseMultimodalProcessor
+from sglang.srt.runtime_context import get_model
 from sglang.srt.server_args import ServerArgs
 
 logger = logging.getLogger(__name__)
@@ -41,10 +42,10 @@ def import_processors(package_name: str, overwrite: bool = False):
                     PROCESSOR_MAPPING[arch] = cls
 
 
-def get_mm_processor_cls(hf_config, server_args: ServerArgs, model_config=None):
+def get_mm_processor_cls(hf_config, model_config=None):
     """The class :func:`get_mm_processor` would instantiate, or ``None`` when the
     architecture has no registered processor."""
-    model_impl = str(getattr(server_args, "model_impl", "auto")).lower()
+    model_impl = str(get_model().model_impl).lower()
     uses_transformers_backend = model_impl == "transformers"
     if model_impl == "auto" and model_config is not None:
         from sglang.srt.model_loader.utils import get_resolved_model_impl
@@ -79,7 +80,7 @@ def get_mm_processor(
     model_config=None,
     **kwargs,
 ) -> BaseMultimodalProcessor:
-    processor_cls = get_mm_processor_cls(hf_config, server_args, model_config)
+    processor_cls = get_mm_processor_cls(hf_config, model_config)
     if processor_cls is None:
         raise ValueError(
             f"No processor registered for architecture: {hf_config.architectures}.\n"

python/sglang/srt/managers/scheduler.py

@@ -992,7 +992,7 @@ class Scheduler(
         # Initialize GEMM-related configuration for FP8 and FP4 backends.
         initialize_fp8_gemm_config()
         initialize_fp4_gemm_config()
-        initialize_bf16_gemm_config(self.server_args)
+        initialize_bf16_gemm_config()
 
         # This must be called after initialize_moe_config
         self.require_mlp_sync = require_mlp_sync()

python/sglang/srt/managers/scheduler_components/metrics_reporter.py

@@ -248,10 +248,10 @@ class SchedulerMetricsReporter:
         self.kv_transfer_latency_ms: float = 0.0
 
         self.enable_mfu_metrics = False
-        self.decode_log_interval = self.scheduler.server_args.decode_log_interval
+        self.decode_log_interval = get_observability().decode_log_interval
 
         if self.enable_metrics:
-            self.enable_mfu_metrics = self.scheduler.server_args.enable_mfu_metrics
+            self.enable_mfu_metrics = get_observability().enable_mfu_metrics
             if self.enable_mfu_metrics:
                 self._init_estimated_perf_constants()
                 self._mfu_log_flops = 0.0

python/sglang/srt/managers/scheduler_components/weight_updater.py

@@ -41,6 +41,7 @@ from sglang.srt.managers.io_struct import (
     UpdateWeightsFromTensorReqInput,
     UpdateWeightsFromTensorReqOutput,
 )
+from sglang.srt.runtime_context import get_model
 
 logger = logging.getLogger(__name__)
 
@@ -198,7 +199,7 @@ class SchedulerWeightUpdaterManager:
         freeing them would leave the daemon and every peer pointing at released
         memory.
         """
-        mode = self.tp_worker.model_runner.server_args.weight_cache_mode
+        mode = get_model().weight_cache_mode
         if mode != "off":
             raise RuntimeError(
                 f"[weight_cache] {op} of model weights is not supported while the "

python/sglang/srt/managers/tokenizer_control_mixin.py

@@ -79,6 +79,7 @@ from sglang.srt.managers.load_snapshot import LoadSnapshot
 from sglang.srt.runtime_context import (
     get_lora,
     get_parallel,
+    get_serving,
     get_spec,
 )
 from sglang.srt.server_args import LoRARef
@@ -209,9 +210,7 @@ class TokenizerControlMixin:
                     iter_external_corpus_chunks,
                 )
 
-                max_tokens = (
+                max_tokens = get_spec().speculative_ngram_external_corpus_max_tokens
-                    self.server_args.speculative_ngram_external_corpus_max_tokens
-                )
                 obj.token_chunks = list(
                     iter_external_corpus_chunks(
                         obj.file_path, self.tokenizer, max_tokens
@@ -222,9 +221,7 @@ class TokenizerControlMixin:
                     SEPARATOR_TOKEN,
                 )
 
-                max_tokens = (
+                max_tokens = get_spec().speculative_ngram_external_corpus_max_tokens
-                    self.server_args.speculative_ngram_external_corpus_max_tokens
-                )
                 token_chunks = []
                 total_tokens = 0
                 has_prev = False
@@ -642,10 +639,10 @@ class TokenizerControlMixin:
                     await self.lora_registry.register(new_adapter)
                     self.lora_ref_cache[obj.lora_name] = new_adapter
 
-                if self.server_args.max_loaded_loras is not None:
+                if get_lora().max_loaded_loras is not None:
                     while (
                         self.lora_registry.num_registered_loras
-                        > self.server_args.max_loaded_loras
+                        > get_lora().max_loaded_loras
                     ):
                         lru_lora_name = await self.lora_registry.lru_lora_name(
                             exclude_pinned=True
@@ -659,7 +656,7 @@ class TokenizerControlMixin:
                         logger.info(
                             f"Unloading least recently used LoRA adapter '{lru_lora_name}' "
                             f"(current number of adapters: {self.lora_registry.num_registered_loras}, "
-                            f"max allowed: {self.server_args.max_loaded_loras})"
+                            f"max allowed: {get_lora().max_loaded_loras})"
                         )
 
                         unload_result = await self._unload_lora_adapter_locked(
@@ -718,10 +715,10 @@ class TokenizerControlMixin:
                 if result.success:
                     await self.lora_registry.register(new_adapter)
                     self.lora_ref_cache[obj.lora_name] = new_adapter
-                if self.server_args.max_loaded_loras is not None:
+                if get_lora().max_loaded_loras is not None:
                     while (
                         self.lora_registry.num_registered_loras
-                        > self.server_args.max_loaded_loras
+                        > get_lora().max_loaded_loras
                     ):
                         lru_lora_name = await self.lora_registry.lru_lora_name(
                             exclude_pinned=True
@@ -735,7 +732,7 @@ class TokenizerControlMixin:
                         logger.info(
                             f"Unloading least recently used LoRA adapter '{lru_lora_name}' "
                             f"(current number of adapters: {self.lora_registry.num_registered_loras}, "
-                            f"max allowed: {self.server_args.max_loaded_loras})"
+                            f"max allowed: {get_lora().max_loaded_loras})"
                         )
 
                         unload_result = await self._unload_lora_adapter_locked(
@@ -905,7 +902,7 @@ class TokenizerControlMixin:
     ):
         self.auto_create_handle_loop()
         if obj.streaming:
-            if not self.server_args.enable_streaming_session:
+            if not get_serving().enable_streaming_session:
                 raise ValueError(
                     "Streaming sessions are disabled. "
                     "Please relaunch with --enable-streaming-session."

python/sglang/srt/managers/tokenizer_manager_score_mixin.py

@@ -9,6 +9,7 @@ from sglang.srt.configs.model_config import is_cross_encoding_pooler_model
 from sglang.srt.constants import MIS_DELIMITER_TOKEN_ID
 from sglang.srt.managers.embed_types import PositionalEmbeds
 from sglang.srt.managers.io_struct import EmbeddingReqInput, GenerateReqInput
+from sglang.srt.runtime_context import get_exec
 
 logger = logging.getLogger(__name__)
 
@@ -509,7 +510,7 @@ class TokenizerManagerScoreMixin:
                     )
 
         # Check if multi-item scoring is enabled
-        use_multi_item_scoring = self.server_args.enable_mis
+        use_multi_item_scoring = get_exec().features.enable_mis
 
         input_ids = None
         text_prompts = None

python/sglang/srt/mem_cache/registry.py

@@ -108,7 +108,7 @@ def default_radix_cache_factory(ctx: TreeCacheBuildContext) -> BasePrefixCache:
         logger.info("Using experimental C++ radix tree implementation.")
         return RadixCacheCpp(params=params, server_args=server_args)
 
-    if server_args.enable_unified_cache_external_linker:
+    if get_memory().enable_unified_cache_external_linker:
         return _create_unified_radix_cache(ctx, server_args, params)
 
     if ctx.is_hybrid_swa and ctx.full_tokens_per_layer == 0:
@@ -196,8 +196,8 @@ def _create_unified_radix_cache(
         ctx.tp_worker.register_hicache_layer_transfer_counter(
             cache.cache_controller.layer_done_counter
         )
-    elif server_args.enable_unified_cache_external_linker:
+    elif get_memory().enable_unified_cache_external_linker:
-        backend = server_args.unified_cache_external_linker_backend
+        backend = get_memory().unified_cache_external_linker_backend
         if backend == "mooncake":
             from sglang.srt.mem_cache.storage.mooncake_store.mooncake_direct_linker import (
                 MooncakeDirectLinker,

python/sglang/srt/mem_cache/storage/mooncake_store/mooncake_direct_linker.py

@@ -20,7 +20,11 @@ from sglang.srt.mem_cache.hybrid_cache.linker_pool_assembler import (
     resolve_hybrid_device_pool_group,
 )
 from sglang.srt.mem_cache.unified_cache.unified_cache_linker import UnifiedCacheLinker
-from sglang.srt.runtime_context import get_memory, get_model
+from sglang.srt.runtime_context import (
+    get_memory,
+    get_model,
+    get_parallel,
+)
 from sglang.srt.utils import freeze_gc, get_device_module
 
 logger = logging.getLogger(__name__)
@@ -102,7 +106,7 @@ class MooncakeDirectLinker(UnifiedCacheLinker):
         self.num_layers = self.pool_group.num_layers
 
         tp_rank = 0
-        tp_size = server_args.tp_size
+        tp_size = get_parallel().tp_size
         tp_group = params.attn_tp_cache_group or params.tp_cache_group
         if torch.distributed.is_available() and torch.distributed.is_initialized():
             tp_rank = torch.distributed.get_rank(group=tp_group)

python/sglang/srt/model_executor/cpu_graph_runner.py

@@ -596,19 +596,15 @@ class CPUGraphRunner:
         self.graphs_cross = {}
         self.output_buffers = {}
         self.enable_torch_compile = get_flags().capture.enable_torch_compile
-        self.disable_padding = model_runner.server_args.disable_cuda_graph_padding
+        self.disable_padding = get_exec().graph.disable_cuda_graph_padding
         self.is_encoder_decoder = model_runner.model_config.is_encoder_decoder
         self.require_gathered_buffer = require_gathered_buffer()
         self.require_mlp_tp_gather = require_mlp_tp_gather()
         self.require_mlp_sync = require_mlp_sync()
         self.require_attn_tp_gather = require_attn_tp_gather()
-        self.enable_two_batch_overlap = (
+        self.enable_two_batch_overlap = get_exec().overlap.enable_two_batch_overlap
-            model_runner.server_args.enable_two_batch_overlap
-        )
         self.speculative_algorithm = get_spec().speculative_algorithm
-        self.enable_profile_cuda_graph = (
+        self.enable_profile_cuda_graph = get_exec().graph.enable_profile_cuda_graph
-            model_runner.server_args.enable_profile_cuda_graph
-        )
         self.tp_size = get_parallel().tp_size
         self.dp_size = get_parallel().dp_size
         self.pp_size = get_parallel().pp_size

python/sglang/srt/model_executor/mindspore_runner.py

@@ -14,7 +14,10 @@ from mindspore._c_expression import GroupOptions
 from mindspore.communication import create_group
 
 from sglang.srt.distributed.parallel_state import _groups
-from sglang.srt.runtime_context import get_serving
+from sglang.srt.runtime_context import (
+    get_parallel,
+    get_serving,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -106,9 +109,9 @@ def reuse_hccl_comm():
         create_group(group_name, group().ranks, group_options)
 
 
-def init_ms_distributed(world_size, rank, local_rank, server_args, port):
+def init_ms_distributed(world_size, rank, local_rank, port):
-    if server_args.dist_init_addr:
+    if get_parallel().dist_init_addr:
-        dist_init_method = f"tcp://{server_args.dist_init_addr}"
+        dist_init_method = f"tcp://{get_parallel().dist_init_addr}"
     else:
         dist_init_method = f"tcp://{get_serving().host}:{port}"
     set_ms_parallel_env(rank, local_rank, world_size, dist_init_method)

python/sglang/srt/model_executor/model_runner.py

@@ -316,7 +316,7 @@ class ModelRunner:
 
     def supports_sampling_observer(self) -> bool:
         """Whether this runner's sampling path publishes observer output."""
-        return self.server_args.dllm_algorithm is None and self.spec_algorithm.is_none()
+        return get_exec().dllm.dllm_algorithm is None and self.spec_algorithm.is_none()
 
     def __init__(
         self,
@@ -644,7 +644,6 @@ class ModelRunner:
                 world_size=self.ps.tp_size * self.ps.pp_size,
                 rank=self.ps.tp_size * self.ps.pp_rank + self.ps.tp_rank,
                 local_rank=self.gpu_id,
-                server_args=self.server_args,
                 port=self.dist_port,
             )
 

python/sglang/srt/model_executor/model_runner_components/cuda_graph_setup.py

@@ -42,6 +42,8 @@ from sglang.srt.runtime_context import (
     get_disagg,
     get_exec,
     get_flags,
+    get_model,
+    get_observability,
     get_parallel,
     get_schedule,
     get_spec,
@@ -281,10 +283,8 @@ def capture_cuda_graphs(
     # not traced into any captured graph — capture stays hook-free and hooks
     # fire only on the eager forward path (capture replay never runs Python
     # hooks anyway).
-    if model_runner.server_args.forward_hooks:
+    if get_observability().forward_hooks:
-        register_forward_hooks(
+        register_forward_hooks(model_runner.model, get_observability().forward_hooks)
-            model_runner.model, model_runner.server_args.forward_hooks
-        )
 
     prealloc_symmetric_memory_pool(
         is_draft_worker=model_runner.is_draft_worker,
@@ -537,7 +537,7 @@ def capture_decode_graph(*, model_runner: ModelRunner) -> GraphCapture:
     if not model_runner.is_generation:
         # TODO: Currently, cuda graph only captures decode steps, which only exists for generation models
         return no_capture
-    if model_runner.server_args.model_impl.lower() == ModelImpl.MINDSPORE:
+    if get_model().model_impl.lower() == ModelImpl.MINDSPORE:
         return no_capture
     if model_runner.device != "cpu" and check_cuda_graph_backend(
         Phase.DECODE, Backend.DISABLED

python/sglang/srt/model_executor/model_runner_components/weight_updater.py

@@ -12,6 +12,7 @@ from sglang.srt.model_loader.loader import DefaultModelLoader, get_model_loader
 from sglang.srt.model_loader.utils import set_default_torch_dtype
 from sglang.srt.model_loader.weight_utils import default_weight_loader
 from sglang.srt.platforms import current_platform
+from sglang.srt.runtime_context import get_model
 from sglang.srt.utils import (
     MultiprocessingSerializer,
     dynamic_import,
@@ -128,7 +129,7 @@ class WeightUpdater:
         param.data is the daemon's master copy shared with every co-attached
         engine, so an in-place update would silently corrupt them all.
         """
-        mode = self.get_model_runner().server_args.weight_cache_mode
+        mode = get_model().weight_cache_mode
         if mode != "off":
             raise RuntimeError(
                 f"[weight_cache] {op} is not supported while the weight cache is "

python/sglang/srt/model_executor/pool_configurator.py

@@ -42,6 +42,7 @@ from sglang.srt.mem_cache.deepseek_v4_memory_pool import (
 from sglang.srt.mem_cache.memory_pool import DSATokenToKVPool
 from sglang.srt.runtime_context import (
     get_disagg,
+    get_exec,
     get_memory,
     get_parallel,
     get_schedule,
@@ -887,7 +888,7 @@ class DSV4PoolConfigurator(MemoryPoolConfigurator):
         # keeps the FP8 estimate.
         self.indexer_bytes_per_token = get_dsv4_indexer_bytes_per_token(
             self.indexer_head_dim,
-            _is_hip and kvc.server_args.enable_deepseek_v4_fp4_indexer,
+            _is_hip and get_exec().kernel.enable_deepseek_v4_fp4_indexer,
         )
         self.context_len = kvc.model_config.context_len
         # PP-local slice; matches DeepSeekV4TokenToKVPool's stage_ratios.

python/sglang/srt/model_executor/runner/base_runner.py

@@ -220,7 +220,7 @@ class BaseRunner(ABC):
         # elastic-EP scale-up rewrites dp_size on the published config
         self.dp_size = get_parallel().dp_size
         self.pp_size = get_parallel().pp_size
-        self.enable_pdmux = model_runner.server_args.enable_pdmux
+        self.enable_pdmux = get_disagg().enable_pdmux
         self.return_hidden_states_mode = (
             CaptureHiddenMode.NULL
             if model_runner.is_draft_worker

python/sglang/srt/model_executor/runner/decode_cuda_graph_runner.py

@@ -229,7 +229,7 @@ class DecodeCudaGraphRunner(BaseCudaGraphRunner):
 
         # --- core state ------------------------------------------------
         self.enable_torch_compile = get_flags().capture.enable_torch_compile
-        self.disable_padding = model_runner.server_args.disable_cuda_graph_padding
+        self.disable_padding = get_exec().graph.disable_cuda_graph_padding
         self.is_encoder_decoder = model_runner.model_config.is_encoder_decoder
         self.require_mlp_tp_gather = (
             require_mlp_tp_gather() and not self._forward_is_dp_local(model_runner)
@@ -244,18 +244,14 @@ class DecodeCudaGraphRunner(BaseCudaGraphRunner):
         self.require_mlp_sync = (
             get_parallel().enable_dp_attention or self.require_gathered_buffer
         )
-        self.enable_two_batch_overlap = (
+        self.enable_two_batch_overlap = get_exec().overlap.enable_two_batch_overlap
-            model_runner.server_args.enable_two_batch_overlap
-        )
         self.use_ngram_embedding = model_runner.ngram_embedding_manager.enabled
         if self.use_ngram_embedding:
             hf_config = model_runner.model_config.hf_config
             self.ngram_embedding_n = hf_config.ngram_embedding_n
             self.ngram_embedding_k = hf_config.ngram_embedding_k
         self.speculative_algorithm = get_spec().speculative_algorithm
-        self.enable_profile_cuda_graph = (
+        self.enable_profile_cuda_graph = get_exec().graph.enable_profile_cuda_graph
-            model_runner.server_args.enable_profile_cuda_graph
-        )
 
         # --- DSA dense-decode dual-graph -------------------------------
         # Capture a "dense" (k-only, skip-indexer) and a "sparse" (full indexer)
@@ -1067,7 +1063,7 @@ class DecodeCudaGraphRunner(BaseCudaGraphRunner):
         # Trigger CUDA graph capture for specific shapes.
         # Capture the large shapes first so that the smaller shapes
         # can reuse the memory pool allocated for the large shapes.
-        with freeze_gc(self.model_runner.server_args.enable_cudagraph_gc):
+        with freeze_gc(get_exec().graph.enable_cudagraph_gc):
             if not self.enable_pdmux:
                 with (
                     graph_capture(

python/sglang/srt/model_executor/runner/prefill_cuda_graph_runner.py

@@ -1413,7 +1413,7 @@ class PrefillCudaGraphRunner(BaseCudaGraphRunner):
         # Warm up + autotune kernels once before capture (run-once across the
         # decode + prefill runners; see BaseRunner.warmup).
         self.warmup()
-        with freeze_gc(self.model_runner.server_args.enable_cudagraph_gc):
+        with freeze_gc(get_exec().graph.enable_cudagraph_gc):
             with graph_capture(
                 stream=get_or_create_global_graph_capture_stream()
             ) as graph_capture_context:

python/sglang/srt/model_executor/runner_backend/cuda_graph_dedup_mixin.py

@@ -8,6 +8,8 @@ from dataclasses import dataclass, field
 
 import torch
 
+from sglang.srt.runtime_context import get_exec
+
 try:
     from cuda.bindings import driver as cuda_drv
     from cuda.bindings import runtime as cuda_rt
@@ -314,7 +316,7 @@ class DedupedCudaGraphMixin:
         server_args = getattr(model_runner, "server_args", None)
         return bool(
             server_args is not None
-            and getattr(server_args, "enable_memory_saver", False)
+            and get_exec().features.enable_memory_saver
             and get_bool_env_var("SGLANG_MEMORY_SAVER_CUDA_GRAPH")
         )
 

python/sglang/srt/model_executor/runner_backend/tc_piecewise_cuda_graph_backend.py

@@ -125,7 +125,7 @@ class TcPiecewiseCudaGraphBackend(BaseCudaGraphBackend):
         config = CompilationConfig(
             num_tokens,
             compiler,
-            server_args.enable_torch_compile_debug_mode,
+            get_exec().graph.enable_torch_compile_debug_mode,
         )
 
         if get_moe_a2a_backend().is_deepep() or get_moe_a2a_backend().is_mooncake():

python/sglang/srt/multimodal/processors/base_processor.py

@@ -43,6 +43,7 @@ from sglang.srt.multimodal.transport.cuda_ipc import (
     get_mm_feature_pool_size_per_worker,
 )
 from sglang.srt.runtime_context import (
+    get_exec,
     get_mm,
     get_serving,
 )
@@ -723,7 +724,7 @@ class BaseMultimodalProcessor(ABC):
         preprocessing worker there is one more competitor for that device rather
         than added parallelism.
         """
-        if _is_cpu or self.server_args.rl_on_policy_target is not None:
+        if _is_cpu or get_exec().deterministic.rl_on_policy_target is not None:
             return False
         if self.disable_fast_image_processor:
             return False
@@ -759,7 +760,7 @@ class BaseMultimodalProcessor(ABC):
         tokenizer process each carry their own ``base_gpu_id``.
         """
         server_args = self.server_args
-        if _is_cpu or server_args.rl_on_policy_target is not None:
+        if _is_cpu or get_exec().deterministic.rl_on_policy_target is not None:
             return "cpu"
         if _is_xpu:
             return "xpu"

python/sglang/srt/multimodal/processors/internvl.py

@@ -20,6 +20,7 @@ from sglang.srt.multimodal.processors.base_processor import (
     BaseMultiModalProcessorOutput,
     MultimodalSpecialTokens,
 )
+from sglang.srt.runtime_context import get_model
 from sglang.srt.utils import get_device
 from sglang.srt.utils.video_decoder import VideoDecoderWrapper
 
@@ -135,7 +136,7 @@ class InternVLProcessor(BaseMultimodalProcessor):
         ).build(_image_processor)
 
         self.max_context_len = (
-            getattr(server_args, "context_length", None)
+            get_model().context_length
             or getattr(server_args, "max_context_len", None)
             or getattr(hf_config, "max_position_embeddings", None)
             or getattr(text_cfg, "max_position_embeddings", None)

python/sglang/srt/multimodal/processors/kimi_k25.py

@@ -23,6 +23,7 @@ from sglang.srt.multimodal.processors.kimi_common import KimiGridMMDataMixin
 from sglang.srt.multimodal.transport.cuda_ipc import (
     DEFER_CUDA_IPC_FEATURE_RECONSTRUCTION_KEY,
 )
+from sglang.srt.runtime_context import get_mm
 
 # ---------------------------------------------------------------------------
 # GPU image preprocessing utilities (resize, pad, normalize, patchify on CUDA)
@@ -595,7 +596,7 @@ class KimiK2_5VLImageProcessor(KimiGridMMDataMixin, SGLangBaseProcessor):
         # its GPU transport proxy lazy until that assignment is known, avoiding a full
         # image copy to every rank. The scheduler only honors this marker once
         # the processor has already set the item's hash and pad value.
-        if self.keep_mm_features_on_device and self.server_args.mm_enable_dp_encoder:
+        if self.keep_mm_features_on_device and get_mm().mm_enable_dp_encoder:
             for item in mm_items:
                 item.model_specific_data[DEFER_CUDA_IPC_FEATURE_RECONSTRUCTION_KEY] = (
                     True

python/sglang/srt/multimodal/processors/nano_nemotron_vl.py

@@ -46,6 +46,7 @@ from sglang.srt.multimodal.processors.base_processor import (
     BaseMultimodalProcessor,
     MultimodalSpecialTokens,
 )
+from sglang.srt.runtime_context import get_model
 from sglang.srt.utils.common import sample_video_frames
 
 logger = logging.getLogger(__name__)
@@ -143,7 +144,7 @@ class NanoNemotronVLImageProcessor(BaseMultimodalProcessor):
             hf_config, "video_maintain_aspect_ratio", True
         )
 
-        self.max_model_len = getattr(server_args, "context_length", None) or 8192
+        self.max_model_len = get_model().context_length or 8192
 
         self.PLACEHOLDER = self.tokenizer.unk_token
         assert isinstance(self.PLACEHOLDER, str)

python/sglang/srt/multimodal/processors/qwen_vl.py

@@ -41,6 +41,7 @@ from sglang.srt.multimodal.processors.base_processor import (
 from sglang.srt.multimodal.transport.cuda_ipc import (
     DEFER_CUDA_IPC_FEATURE_RECONSTRUCTION_KEY,
 )
+from sglang.srt.runtime_context import get_mm
 from sglang.srt.utils import cpu_has_amx_support, is_cpu
 from sglang.srt.utils.video_decoder import VideoDecoderWrapper
 from sglang.utils import logger
@@ -897,7 +898,7 @@ class QwenVLImageProcessor(SGLangBaseProcessor):
     def _mark_dp_encoder_features_for_deferred_reconstruction(self, mm_items):
         if not (
             self.keep_mm_features_on_device
-            and self.server_args.mm_enable_dp_encoder
+            and get_mm().mm_enable_dp_encoder
             and self.model_type
             in ("qwen3_vl", "qwen3_vl_moe", "qwen3_5", "qwen3_5_moe")
         ):

python/sglang/srt/observability/request_metrics_exporter.py

@@ -83,7 +83,10 @@ class FileRequestMetricsExporter(RequestMetricsExporter):
         out_skip_names: Optional[set[str]],
     ):
         super().__init__(server_args, obj_skip_names, out_skip_names)
-        self.export_dir = getattr(server_args, "export_metrics_to_file_dir")
+        # Given at construction, not read from the process: the exporter is
+        # handed the directory it writes to, and a test builds several with
+        # different ones.
+        self.export_dir = server_args.export_metrics_to_file_dir
         os.makedirs(self.export_dir, exist_ok=True)
 
         # File handler state management

python/sglang/srt/parser/template_manager.py

@@ -50,6 +50,7 @@ from sglang.srt.parser.template_detection import (
     detect_reasoning_pattern,
     match_rules,
 )
+from sglang.srt.runtime_context import get_serving
 
 logger = logging.getLogger(__name__)
 
@@ -384,7 +385,7 @@ class TemplateManager:
         logger.info(f"Multiple HuggingFace chat templates available: {available_names}")
 
         # Use specified template if provided
-        if preferred_name := tokenizer_manager.server_args.hf_chat_template_name:
+        if preferred_name := get_serving().hf_chat_template_name:
             if preferred_name not in templates:
                 raise ValueError(
                     f"Specified template '{preferred_name}' not found. "

python/sglang/srt/ray/engine.py

@@ -203,9 +203,7 @@ def _create_scheduler_actor(
         rank0_node_ip: IP of rank-0's node, used for NCCL rendezvous.
         dist_init_addr: Distributed init address (tcp://rank0_node_ip:nccl_port).
     """
-    attn_cp_rank, moe_dp_rank, moe_ep_rank = _compute_parallelism_ranks(
+    attn_cp_rank, moe_dp_rank, moe_ep_rank = _compute_parallelism_ranks(tp_rank)
-        server_args, tp_rank
-    )
 
     return SchedulerActor.options(
         num_cpus=0,

python/sglang/srt/runtime_context.py

@@ -1347,7 +1347,13 @@ ROLE_NAMESPACE_SETS: dict[str, frozenset[str] | None] = {
     # The DP controller's static read set, checked against the module: the
     # elastic-EP gate, the load-balance method, the watchdog timeout, and the
     # disaggregation mode.
-    "dp_controller": frozenset({"exec", "parallel", "device", "disagg"}),
+    # `observability` and `serving` were added when the controller's metrics
+    # gate, tracing setup and worker-port broadcast stopped reading the record:
+    # under `enforce` the set is what the process may read, so a conversion
+    # that reaches a new namespace has to widen it in the same commit.
+    "dp_controller": frozenset(
+        {"exec", "parallel", "device", "disagg", "observability", "serving"}
+    ),
     # Record-mode audit (2026-08-06, text model, /generate + /get_server_info +
     # /v1/models): reads exactly {"serving"} — the per-instance managers read
     # self.server_args by design. Still declared full, because that run did not

python/sglang/srt/rust_server/multimodal.py

@@ -167,7 +167,7 @@ class RustMmProcessor:
 
         hf_config = self.model_config.hf_config
         mm_processor_cls = get_mm_processor_cls(
-            hf_config, self.server_args, model_config=self.model_config
+            hf_config, model_config=self.model_config
         )
         family = rust_mm_family_for(
             mm_processor_cls, getattr(hf_config, "model_type", None)

python/sglang/srt/speculative/eagle_draft_cuda_graph_runner.py

@@ -35,6 +35,7 @@ from sglang.srt.model_executor.runner_backend_utils import (
     CUDA_GRAPH_CAPTURE_FAILED_MSG,
 )
 from sglang.srt.runtime_context import (
+    get_exec,
     get_flags,
     get_parallel,
     get_spec,
@@ -115,14 +116,12 @@ class EAGLEDraftCudaGraphRunner(DecodeCudaGraphRunner):
         self.attn_dp_size = model_runner.ps.attn_dp_size
         self.pp_size = get_parallel().pp_size
         self.enable_torch_compile = get_flags().capture.enable_torch_compile
-        self.disable_padding = model_runner.server_args.disable_cuda_graph_padding
+        self.disable_padding = get_exec().graph.disable_cuda_graph_padding
         self.require_gathered_buffer = require_gathered_buffer()
         self.require_mlp_tp_gather = require_mlp_tp_gather()
         self.require_mlp_sync = require_mlp_sync()
         self.require_attn_tp_gather = require_attn_tp_gather()
-        self.enable_profile_cuda_graph = (
+        self.enable_profile_cuda_graph = get_exec().graph.enable_profile_cuda_graph
-            model_runner.server_args.enable_profile_cuda_graph
-        )
         self.speculative_num_steps = (
             get_spec().speculative_num_steps
             if speculative_num_steps is None
@@ -196,7 +195,7 @@ class EAGLEDraftCudaGraphRunner(DecodeCudaGraphRunner):
                     (self.max_bs, self.model_runner.model_config.vocab_size),
                     dtype=torch.float32,
                 )
-                if self.model_runner.server_args.speculative_use_rejection_sampling
+                if get_spec().speculative_use_rejection_sampling
                 else None
             )
             _hidden_size, _hidden_dtype = get_draft_recurrent_hidden_state_spec(
@@ -616,7 +615,7 @@ class EAGLEDraftCudaGraphRunner(DecodeCudaGraphRunner):
         # Only rejection sampling reads temperatures (renorm_draft_probs); skip
         # the copy otherwise to keep the non-RS path free of extra work.
         if (
-            self.model_runner.server_args.speculative_use_rejection_sampling
+            get_spec().speculative_use_rejection_sampling
             and forward_batch.sampling_info is not None
         ):
             self.temperatures[:raw_bs].copy_(

python/sglang/srt/speculative/eagle_draft_extend_cuda_graph_runner.py

@@ -36,6 +36,7 @@ from sglang.srt.model_executor.runner_backend_utils import (
     CUDA_GRAPH_CAPTURE_FAILED_MSG,
 )
 from sglang.srt.runtime_context import (
+    get_exec,
     get_flags,
     get_parallel,
     get_spec,
@@ -114,14 +115,12 @@ class EAGLEDraftExtendCudaGraphRunner(DecodeCudaGraphRunner):
         self.attn_dp_size = model_runner.ps.attn_dp_size
         self.pp_size = get_parallel().pp_size
         self.enable_torch_compile = get_flags().capture.enable_torch_compile
-        self.disable_padding = model_runner.server_args.disable_cuda_graph_padding
+        self.disable_padding = get_exec().graph.disable_cuda_graph_padding
         self.require_gathered_buffer = require_gathered_buffer()
         self.require_mlp_tp_gather = require_mlp_tp_gather()
         self.require_mlp_sync = require_mlp_sync()
         self.require_attn_tp_gather = require_attn_tp_gather()
-        self.enable_profile_cuda_graph = (
+        self.enable_profile_cuda_graph = get_exec().graph.enable_profile_cuda_graph
-            model_runner.server_args.enable_profile_cuda_graph
-        )
         self.speculative_num_steps = (
             get_spec().speculative_num_steps
             if speculative_num_steps is None

python/sglang/srt/speculative/frozen_kv_mtp_cuda_graph_runner.py

@@ -33,6 +33,7 @@ from sglang.srt.model_executor.runner_backend_utils import (
     CUDA_GRAPH_CAPTURE_FAILED_MSG,
 )
 from sglang.srt.runtime_context import (
+    get_exec,
     get_flags,
     get_parallel,
     get_spec,
@@ -92,7 +93,7 @@ class FrozenKVMTPCudaGraphRunner(DecodeCudaGraphRunner):
         self.device = model_runner.device
         self.device_module = torch.get_device_module(self.device)
         self.enable_torch_compile = get_flags().capture.enable_torch_compile
-        self.disable_padding = model_runner.server_args.disable_cuda_graph_padding
+        self.disable_padding = get_exec().graph.disable_cuda_graph_padding
         self.require_gathered_buffer = require_gathered_buffer()
         self.require_mlp_tp_gather = require_mlp_tp_gather()
         self.require_mlp_sync = require_mlp_sync()
@@ -103,9 +104,7 @@ class FrozenKVMTPCudaGraphRunner(DecodeCudaGraphRunner):
         self.speculative_num_steps = get_spec().speculative_num_steps
         self.topk = get_spec().speculative_eagle_topk
         self.draft_attn_backend = frozen_kv_mtp_worker.draft_attn_backend
-        self.enable_profile_cuda_graph = (
+        self.enable_profile_cuda_graph = get_exec().graph.enable_profile_cuda_graph
-            model_runner.server_args.enable_profile_cuda_graph
-        )
 
         self.attn_backend = self.draft_attn_backend
 

python/sglang/srt/speculative/multi_layer_eagle_draft_extend_cuda_graph_runner.py

@@ -60,6 +60,8 @@ from sglang.srt.model_executor.runner_backend_utils import (
     CUDA_GRAPH_CAPTURE_FAILED_MSG,
 )
 from sglang.srt.runtime_context import (
+    get_disagg,
+    get_exec,
     get_flags,
     get_parallel,
     get_spec,
@@ -157,18 +159,16 @@ class MultiLayerEagleDraftExtendCudaGraphRunner(DecodeCudaGraphRunner):
         self.dp_size = get_parallel().dp_size
         self.pp_size = get_parallel().pp_size
         self.enable_torch_compile = get_flags().capture.enable_torch_compile
-        self.disable_padding = model_runner.server_args.disable_cuda_graph_padding
+        self.disable_padding = get_exec().graph.disable_cuda_graph_padding
         self.require_gathered_buffer = require_gathered_buffer()
         self.require_mlp_tp_gather = require_mlp_tp_gather()
         self.require_mlp_sync = require_mlp_sync()
         self.require_attn_tp_gather = require_attn_tp_gather()
-        self.enable_pdmux = model_runner.server_args.enable_pdmux
+        self.enable_pdmux = get_disagg().enable_pdmux
         self.speculative_num_steps = get_spec().speculative_num_steps
         self.speculative_num_draft_tokens = get_spec().speculative_num_draft_tokens
         self.topk = get_spec().speculative_eagle_topk
-        self.enable_profile_cuda_graph = (
+        self.enable_profile_cuda_graph = get_exec().graph.enable_profile_cuda_graph
-            model_runner.server_args.enable_profile_cuda_graph
-        )
         self.attn_backend = self.eagle_worker.draft_extend_attn_backend_list[self.step]
         self.metadata_captured_in_graph = (
             self.attn_backend.draft_extend_metadata_captured_in_graph()

python/sglang/srt/weight_cache/daemon.py

@@ -50,7 +50,11 @@ import torch.distributed as dist
 from sglang.srt.arg_groups.overrides import resolving_view
 from sglang.srt.configs.load_config import LoadConfig
 from sglang.srt.platforms import current_platform
-from sglang.srt.runtime_context import get_parallel, publish
+from sglang.srt.runtime_context import (
+    get_exec,
+    get_parallel,
+    publish,
+)
 
 from .protocol import (
     CacheConfig,
@@ -465,7 +469,7 @@ class WeightCacheDaemon:
 
     def _initialize_eplb_expert_location_metadata(self, model_config) -> None:
         """Build the same initial physical expert layout as the engine."""
-        if not self.server_args.enable_eplb:
+        if not get_exec().moe.enable_eplb:
             return
 
         from sglang.srt.eplb.expert_location import (

python/sglang/test/test_utils.py

@@ -2143,6 +2143,20 @@ def server_args_variant(server_args, **fields):
     return variant
 
 
+def enter_override(test_case, override):
+    """Install a scoped context override for the length of one test.
+
+    `unittest.TestCase.enterContext` does exactly this in one call, but it is
+    Python 3.11+ and this package supports 3.10 (`requires-python = ">=3.10"`).
+    On 3.10 it raises `AttributeError: ... has no attribute 'enterContext'` --
+    and only there, so a developer on a newer interpreter sees every test pass
+    while CI does not.
+    """
+    installed = override.install()
+    test_case.addCleanup(override.restore)
+    return installed
+
+
 class CustomTestCase(unittest.TestCase):
     def __init_subclass__(cls, **kwargs):
         super().__init_subclass__(**kwargs)

test/registered/lora/test_lora_openai_api.py

@@ -9,6 +9,7 @@ import unittest
 from unittest.mock import MagicMock
 
 from sglang.srt.entrypoints.openai.serving_base import OpenAIServingBase
+from sglang.srt.runtime_context import publish, reset_context
 from sglang.srt.server_args import ServerArgs
 from sglang.test.ci.ci_register import register_amd_ci, register_cpu_ci
 
@@ -16,13 +17,22 @@ register_amd_ci(est_time=30, suite="nightly-amd-1-gpu", nightly=True)
 register_cpu_ci(est_time=7, suite="stage-b-test-cpu-intel")
 
 
+def publish_config(case):
+    """`OpenAIServingBase.__init__` reads `get_observability()`, so a case that
+    builds one needs a published config. The mock manager cannot stand in for
+    it: `MagicMock(spec=ServerArgs)` passes the `isinstance` guard, so the read
+    happens and there is no bag to answer from."""
+    reset_context()
+    case.addCleanup(reset_context)
+    publish(ServerArgs(model_path="dummy"), role="tokenizer")
+
+
 class MockTokenizerManager:
     """Mock TokenizerManager for testing."""
 
     def __init__(self, enable_lora=False):
         self.server_args = MagicMock(spec=ServerArgs)
         self.server_args.enable_lora = enable_lora
-        self.server_args.tokenizer_metrics_allowed_custom_labels = None
 
 
 class ConcreteServingBase(OpenAIServingBase):
@@ -42,6 +52,7 @@ class TestParseModelParameter(unittest.TestCase):
     """Test _parse_model_parameter method."""
 
     def setUp(self):
+        publish_config(self)
         self.tokenizer_manager = MockTokenizerManager(enable_lora=True)
         self.serving = ConcreteServingBase(self.tokenizer_manager)
 
@@ -98,6 +109,7 @@ class TestResolveLoraPath(unittest.TestCase):
     """Test _resolve_lora_path method."""
 
     def setUp(self):
+        publish_config(self)
         self.tokenizer_manager = MockTokenizerManager(enable_lora=True)
         self.serving = ConcreteServingBase(self.tokenizer_manager)
 
@@ -146,6 +158,7 @@ class TestIntegrationScenarios(unittest.TestCase):
     """Integration tests for common usage scenarios."""
 
     def setUp(self):
+        publish_config(self)
         self.tokenizer_manager = MockTokenizerManager(enable_lora=True)
         self.serving = ConcreteServingBase(self.tokenizer_manager)
 
@@ -197,6 +210,7 @@ class TestEdgeCases(unittest.TestCase):
     """Test edge cases and error conditions."""
 
     def setUp(self):
+        publish_config(self)
         self.tokenizer_manager = MockTokenizerManager(enable_lora=True)
         self.serving = ConcreteServingBase(self.tokenizer_manager)
 

test/registered/unit/disaggregation/test_decode_queue_cleanup.py

@@ -14,7 +14,8 @@ from sglang.srt.disaggregation.utils import DisaggregationMode
 from sglang.srt.distributed.parallel_state_wrapper import ParallelState
 from sglang.srt.managers.schedule_batch import FINISH_ABORT
 from sglang.srt.managers.scheduler import Scheduler
-from sglang.srt.runtime_context import get_context
+from sglang.srt.runtime_context import get_context, publish, reset_context
+from sglang.srt.server_args import ServerArgs
 from sglang.test.ci.ci_register import register_cpu_ci
 from sglang.test.test_utils import CustomTestCase
 
@@ -34,6 +35,12 @@ class FakeReceiver:
 
 
 class TestDecodeQueueCleanup(CustomTestCase):
+    def setUp(self):
+        # The code under test reads its config from the bags.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
+
     def test_paged_swa_retraction_resume_uses_physical_page_budget(self):
         # resume_retracted_reqs reads the retraction backend off the disagg
         # bag, so the case publishes a config instead of injecting one.

test/registered/unit/entrypoints/openai/test_serving_chat.py

@@ -43,9 +43,11 @@ from sglang.srt.parser.jinja_template_utils import (
     jinja_template_may_reorder_tool_results,
 )
 from sglang.srt.parser.template_detection import ReasoningToggleConfig
+from sglang.srt.runtime_context import get_context, publish, reset_context
 from sglang.srt.sampling.sampling_params import (
     REQUEST_REASONING_END_TOKEN_IDS_KEY,
 )
+from sglang.srt.server_args import ServerArgs
 from sglang.srt.utils import get_or_create_event_loop
 from sglang.test.ci.ci_register import register_cpu_ci
 
@@ -196,6 +198,22 @@ class _MockTemplateManager:
 class ServingChatTestCase(unittest.TestCase):
     # ------------- common fixtures -------------
     def setUp(self):
+        # The serving layer reads its config from the bags, so the fixture has
+        # to publish one rather than hang the values off a mock manager.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(
+            ServerArgs(
+                model_path="dummy",
+                revision=None,
+                enable_cache_report=False,
+                tool_call_parser="hermes",
+                reasoning_parser=None,
+                stream_response_default_include_usage=False,
+                default_chat_template_kwargs=None,
+            ),
+            role="tokenizer",
+        )
         self.tm = _MockTokenizerManager()
         self.template_manager = _MockTemplateManager()
         self.chat = OpenAIServingChat(self.tm, self.template_manager)
@@ -3643,14 +3661,14 @@ class ServingChatTestCase(unittest.TestCase):
 
     def test_continuous_usage_reports_cached_tokens(self):
         """continuous_usage_stats chunks include cached tokens when cache reporting is on."""
-        self.tm.server_args.enable_cache_report = True
+        self.enterContext(get_context().override_server_args(enable_cache_report=True))
         usages = self._collect_continuous_usage(cached_tokens=6)
         self.assertTrue(usages, "continuous_usage_stats attached no usage")
         self.assertEqual(usages[0]["prompt_tokens_details"]["cached_tokens"], 6)
 
     def test_continuous_usage_omits_cached_tokens_when_report_disabled(self):
         """With cache reporting off, continuous_usage_stats must not leak cached tokens."""
-        self.tm.server_args.enable_cache_report = False
+        self.enterContext(get_context().override_server_args(enable_cache_report=False))
         usages = self._collect_continuous_usage(cached_tokens=6)
         self.assertTrue(usages, "continuous_usage_stats attached no usage")
         self.assertIsNone(usages[0].get("prompt_tokens_details"))
@@ -3666,7 +3684,9 @@ class ServingChatTestCase(unittest.TestCase):
         Regression test for https://github.com/sgl-project/sglang/issues/22510.
         """
         # Enable incremental_streaming_output on the mock
-        self.tm.server_args.incremental_streaming_output = True
+        self.enterContext(
+            get_context().override_server_args(incremental_streaming_output=True)
+        )
 
         # Simulate incremental streaming: each yield has ONLY the new text (delta),
         # NOT the full accumulated text.
@@ -4146,6 +4166,9 @@ class TestProcessToolCallsWithRequiredToolChoice(unittest.TestCase):
     """Test _process_tool_calls with tool_choice='required' uses model-specific parser."""
 
     def setUp(self):
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
         tm = _MockTokenizerManager()
         tm.server_args.tool_call_parser = "kimi_k2"
         self.chat = OpenAIServingChat(tm, _MockTemplateManager())

test/registered/unit/entrypoints/openai/test_serving_completions.py

@@ -19,6 +19,8 @@ from fastapi import Request
 from sglang.srt.entrypoints.openai.protocol import CompletionRequest
 from sglang.srt.entrypoints.openai.serving_completions import OpenAIServingCompletion
 from sglang.srt.managers.tokenizer_manager import TokenizerManager
+from sglang.srt.runtime_context import get_context, publish, reset_context
+from sglang.srt.server_args import ServerArgs
 from sglang.srt.utils import get_or_create_event_loop
 from sglang.test.ci.ci_register import register_cpu_ci
 
@@ -66,6 +68,9 @@ class ServingCompletionTestCase(unittest.TestCase):
 
     # ---------- shared test fixtures ----------
     def setUp(self):
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
         # build the mock TokenizerManager once for every test
         tm = Mock(spec=TokenizerManager)
 
@@ -322,15 +327,18 @@ class ServingCompletionTestCase(unittest.TestCase):
             return_token_ids=True,
         )
         adapted_request, _ = self.sc._convert_to_internal_request(req)
-        self.sc.tokenizer_manager.server_args.stream_response_default_include_usage = (
-            False
-        )
 
         for incremental in (False, True):
-            with self.subTest(incremental_streaming_output=incremental):
+            # Both of these are read through `get_serving()` now, so assigning
-                self.sc.tokenizer_manager.server_args.incremental_streaming_output = (
+            # them on the mock manager's record has no effect on what the code
-                    incremental
+            # under test sees. State them where the code reads them.
-                )
+            with (
+                self.subTest(incremental_streaming_output=incremental),
+                get_context().override_server_args(
+                    stream_response_default_include_usage=False,
+                    incremental_streaming_output=incremental,
+                ),
+            ):
                 texts = ("a", "b", "c") if incremental else ("a", "ab", "abc")
                 output_ids = (
                     ([5], [6], [7]) if incremental else ([5], [5, 6], [5, 6, 7])

test/registered/unit/entrypoints/openai/test_serving_responses.py

@@ -23,9 +23,11 @@ from sglang.srt.entrypoints.openai.serving_responses import (
 )
 from sglang.srt.function_call.core_types import ToolCallItem
 from sglang.srt.parser.template_detection import ReasoningToggleConfig
+from sglang.srt.runtime_context import publish, reset_context
 from sglang.srt.sampling.sampling_params import (
     REQUEST_REASONING_END_TOKEN_IDS_KEY,
 )
+from sglang.srt.server_args import ServerArgs
 from sglang.test.ci.ci_register import register_cpu_ci
 from sglang.test.test_utils import CustomTestCase
 
@@ -625,6 +627,9 @@ class OutputItemsTestCase(CustomTestCase):
     def setUp(self):
         # qwen3_coder is the default for this class; the one no-native-parser
         # case overrides it.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
         self.serving = make_serving()
         self.serving.tool_call_parser = "qwen3_coder"
 

test/registered/unit/entrypoints/openai/test_serving_responses_stream.py

@@ -11,6 +11,8 @@ from utils import (
 )
 
 from sglang.srt.entrypoints.openai.protocol import ResponsesRequest
+from sglang.srt.runtime_context import publish, reset_context
+from sglang.srt.server_args import ServerArgs
 from sglang.test.ci.ci_register import register_cpu_ci
 from sglang.test.test_utils import CustomTestCase
 
@@ -246,6 +248,10 @@ class MultiToolCallStreamingOrderTestCase(CustomTestCase):
     def setUp(self):
         from sglang.srt.function_call.qwen3_coder_detector import Qwen3CoderDetector
 
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
+
         self.serving = make_serving()
         self.serving.tool_call_parser = "qwen3_coder"
         self.serving.reasoning_parser = None

test/registered/unit/entrypoints/openai/test_serving_transcription.py

@@ -10,7 +10,7 @@ The tests mock ``TokenizerManager.generate_request`` to yield synthetic
 ``text`` chunks for each of the happy, abort, and boundary cases.
 """
 
-from sglang.test.test_utils import maybe_stub_sgl_kernel
+from sglang.test.test_utils import enter_override, maybe_stub_sgl_kernel
 
 maybe_stub_sgl_kernel()  # must precede any import that pulls in sgl_kernel
 
@@ -32,6 +32,8 @@ from sglang.srt.entrypoints.openai.serving_transcription import (
     OpenAIServingTranscription,
 )
 from sglang.srt.managers.io_struct import GenerateReqInput
+from sglang.srt.runtime_context import get_context, publish, reset_context
+from sglang.srt.server_args import ServerArgs
 from sglang.srt.utils import get_or_create_event_loop
 from sglang.test.ci.ci_register import register_cpu_ci
 from sglang.test.test_utils import CustomTestCase
@@ -102,6 +104,16 @@ def _deltas_from_sse(sse_lines: List[str]) -> List[str]:
 class TestStreamingFusedAutodetect(CustomTestCase):
     """_generate_transcription_stream with _fused_autodetect=True."""
 
+    def setUp(self):
+        # The transcription serving layer reads its config from the bags, so
+        # the fixture publishes one instead of hanging values off a mock.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(
+            ServerArgs(model_path="dummy", asr_max_concurrent_sessions=32),
+            role="tokenizer",
+        )
+
     def _run_stream(
         self, chunks: List[dict], fused: bool = True, ts_variant: bool = False
     ):
@@ -318,6 +330,16 @@ class TestLongAudioChunkedNonStreaming(CustomTestCase):
     requests and the transcripts stitched in order — without chunking the
     feature extractor silently truncates everything past 30 s."""
 
+    def setUp(self):
+        # The transcription serving layer reads its config from the bags, so
+        # the fixture publishes one instead of hanging values off a mock.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(
+            ServerArgs(model_path="dummy", asr_max_concurrent_sessions=32),
+            role="tokenizer",
+        )
+
     def _create_transcription(self, tm, audio_bytes, language="en", **kwargs):
         serving = OpenAIServingTranscription(tm)
         loop = get_or_create_event_loop()
@@ -510,6 +532,16 @@ class TestLongAudioChunkedStreaming(CustomTestCase):
     """_generate_long_audio_stream: chunks transcribed sequentially, deltas
     emitted in audio order, exactly one finish frame."""
 
+    def setUp(self):
+        # The transcription serving layer reads its config from the bags, so
+        # the fixture publishes one instead of hanging values off a mock.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(
+            ServerArgs(model_path="dummy", asr_max_concurrent_sessions=32),
+            role="tokenizer",
+        )
+
     def _run_stream(self, results_per_request, fused=False, n_chunks=2):
         tm = _MockChunkTokenizerManager(results_per_request)
         serving = OpenAIServingTranscription(tm)
@@ -679,6 +711,16 @@ class TestStreamingIncrementalOutputMode(CustomTestCase):
     server already sent as a delta.
     """
 
+    def setUp(self):
+        # The transcription serving layer reads its config from the bags, so
+        # the fixture publishes one instead of hanging values off a mock.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(
+            ServerArgs(model_path="dummy", asr_max_concurrent_sessions=32),
+            role="tokenizer",
+        )
+
     def _run_incremental_stream(self, chunk_deltas, fused=False):
         """Server in incremental mode: yield per-chunk delta, not cumulative."""
         chunks = [
@@ -686,9 +728,8 @@ class TestStreamingIncrementalOutputMode(CustomTestCase):
             for i, d in enumerate(chunk_deltas)
         ]
         tm = _MockTokenizerManager(chunks)
-        tm.server_args = Mock(
+        enter_override(
-            incremental_streaming_output=True,
+            self, get_context().override_server_args(incremental_streaming_output=True)
-            asr_max_concurrent_sessions=32,
         )
         serving = OpenAIServingTranscription(tm)
 

test/registered/unit/entrypoints/openai/utils.py

@@ -27,6 +27,8 @@ from unittest.mock import Mock
 
 from sglang.srt.entrypoints.openai.protocol import RequestResponseMetadata
 from sglang.srt.entrypoints.openai.serving_responses import OpenAIServingResponses
+from sglang.srt.runtime_context import get_context, publish
+from sglang.srt.server_args import ServerArgs
 from sglang.test.ci.ci_register import register_cpu_ci
 
 register_cpu_ci(
@@ -83,6 +85,11 @@ class MockTemplateManager:
 
 
 def make_serving(*, is_multimodal: bool = False) -> OpenAIServingResponses:
+    """The serving layer reads its config from the bags, so the fixture
+    publishes one. Idempotent: a caller that already published keeps its own,
+    which is how a test states a value the default record does not carry."""
+    if not get_context().is_config_namespace_published("serving"):
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
     return OpenAIServingResponses(
         MockTokenizerManager(is_multimodal=is_multimodal), MockTemplateManager()
     )

test/registered/unit/layers/test_layernorm_sp.py

@@ -11,7 +11,13 @@ from types import SimpleNamespace
 from sglang.srt.arg_groups.layernorm_sp_hook import validate_layernorm_sp
 from sglang.srt.layers import layernorm_sp
 from sglang.srt.model_executor.forward_batch_info import ForwardMode
-from sglang.srt.runtime_context import get_flags, get_forward, reset_context
+from sglang.srt.runtime_context import (
+    get_flags,
+    get_forward,
+    publish,
+    reset_context,
+)
+from sglang.srt.server_args import ServerArgs
 from sglang.test.ci.ci_register import register_cpu_ci
 from sglang.test.test_utils import CustomTestCase
 
@@ -19,8 +25,10 @@ register_cpu_ci(est_time=9, suite="base-a-test-cpu")
 
 
 def _initialize(*, enable=True, arch="Qwen3ForCausalLM"):
+    publish(
+        ServerArgs(model_path="dummy", enable_layernorm_sp=enable), role="tokenizer"
+    )
     layernorm_sp.initialize_layernorm_sp(
-        server_args=SimpleNamespace(enable_layernorm_sp=enable),
         model_config=SimpleNamespace(
             hf_config=SimpleNamespace(architectures=[arch] if arch else [])
         ),

test/registered/unit/managers/test_embed_overrides.py

@@ -21,6 +21,8 @@ from sglang.srt.managers.tokenizer_manager import TokenizerManager
 from sglang.srt.managers.tokenizer_manager_score_mixin import (
     TokenizerManagerScoreMixin,
 )
+from sglang.srt.runtime_context import publish, reset_context
+from sglang.srt.server_args import ServerArgs
 from sglang.test.ci.ci_register import register_cpu_ci
 from sglang.test.test_utils import CustomTestCase
 
@@ -45,6 +47,12 @@ def _vec2d(val: float = 1.0) -> torch.Tensor:
 
 
 class TestPositionalEmbeds(CustomTestCase):
+    def setUp(self):
+        # The code under test reads its config from the bags.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
+
     def test_from_list_of_1d_tensors(self):
         pe = PositionalEmbeds(embeds=[_vec(1), _vec(2)], positions=[0, 5])
         self.assertEqual(pe.embeds.shape, (2, HIDDEN_DIM))
@@ -75,6 +83,12 @@ class TestPositionalEmbeds(CustomTestCase):
 
 
 class TestConvertEmbedsToTensors(CustomTestCase):
+    def setUp(self):
+        # The code under test reads its config from the bags.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
+
     def test_none_returns_none(self):
         self.assertIsNone(convert_embeds_to_tensors(None))
 
@@ -110,6 +124,12 @@ class TestConvertEmbedsToTensors(CustomTestCase):
 
 
 class TestResolveEmbedOverrides(CustomTestCase):
+    def setUp(self):
+        # The code under test reads its config from the bags.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
+
     def test_basic_resolution(self):
         embeds = [_vec(1), _vec(2)]
         pe = TokenizerManager._resolve_embed_overrides(
@@ -144,6 +164,12 @@ class TestResolveEmbedOverrides(CustomTestCase):
 
 
 class TestGenerateReqInputEmbedOverride(CustomTestCase):
+    def setUp(self):
+        # The code under test reads its config from the bags.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
+
     def test_single_override_in_getitem(self):
         """Single PositionalEmbeds is shared across all items in __getitem__."""
         pe = PositionalEmbeds(embeds=[_vec()], positions=[0])
@@ -176,6 +202,12 @@ class TestGenerateReqInputEmbedOverride(CustomTestCase):
 
 
 class TestEmbeddingReqInputEmbedOverride(CustomTestCase):
+    def setUp(self):
+        # The code under test reads its config from the bags.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
+
     def test_override_fields_in_getitem(self):
         """embed_override_token_id, embed_overrides, and positional_embed_overrides
         are correctly sliced in __getitem__."""
@@ -220,6 +252,9 @@ class _FakeMixin(TokenizerManagerScoreMixin):
 
 class TestResolveOverridesForSequence(CustomTestCase):
     def setUp(self):
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
         self.mixin = _FakeMixin()
 
     def test_none_embeds_returns_empty(self):
@@ -276,6 +311,9 @@ class TestResolveOverridesForSequence(CustomTestCase):
 
 class TestResolveEmbedOverridesForRequest(CustomTestCase):
     def setUp(self):
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
         self.mixin = _FakeMixin()
 
     def test_no_overrides_returns_none(self):
@@ -339,6 +377,9 @@ DELIM_TOKEN = MIS_DELIMITER_TOKEN_ID
 
 class TestBuildTokenIdInputs(CustomTestCase):
     def setUp(self):
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
         self.mixin = _FakeMixin(enable_mis=True)
 
     # --- single-item mode, no embeds ---
@@ -505,6 +546,9 @@ class TestScoreRequestValidation(CustomTestCase):
     """Test validation guards in score_request without running full pipeline."""
 
     def setUp(self):
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
         self.mixin = _FakeMixin()
 
     def _call(self, **kwargs):

test/registered/unit/managers/test_hisparse_unit.py

@@ -15,6 +15,8 @@ from types import SimpleNamespace
 import torch
 
 from sglang.srt.managers.schedule_batch import ReqKvInfo
+from sglang.srt.runtime_context import publish, reset_context
+from sglang.srt.server_args import ServerArgs
 from sglang.srt.utils import is_cuda, is_hip, is_npu, is_xpu
 from sglang.srt.utils.common import Range
 from sglang.test.ci.ci_register import register_amd_ci, register_cuda_ci
@@ -165,7 +167,14 @@ class TestHiSparseUnit(unittest.TestCase):
 
         Without this, a mid-test assertion failure skips cleanup and leaks
         resources, causing unrelated failures in later tests.
+
+        The code under test reads its configuration from the bags -- the PD
+        decode prealloc path asks whether the decode radix cache is on -- so a
+        case here needs a published config, the way a real process has one.
         """
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="scheduler")
         self.allocator.clear()
         self.req_to_token_pool.clear()
         self.coordinator.mem_pool_host.clear()
@@ -758,7 +767,6 @@ class TestHiSparseUnit(unittest.TestCase):
         queue.scheduler = SimpleNamespace(
             enable_hisparse=True,
             hisparse_coordinator=self.coordinator,
-            server_args=SimpleNamespace(disaggregation_decode_enable_radix_cache=False),
         )
 
         host_indices = queue._pre_alloc(req)

test/registered/unit/managers/test_priority_scheduling_disaggregation.py

@@ -19,13 +19,20 @@ from sglang.srt.managers.schedule_batch import (  # noqa: E402
     ReqKvInfo,
 )
 from sglang.srt.managers.scheduler import Scheduler  # noqa: E402
-from sglang.srt.runtime_context import get_context  # noqa: E402
+from sglang.srt.runtime_context import get_context, publish, reset_context  # noqa: E402
+from sglang.srt.server_args import ServerArgs
 from sglang.test.ci.ci_register import register_cpu_ci
 
 register_cpu_ci(est_time=12, suite="base-a-test-cpu")
 
 
 class TestDisaggregationPriorityQueueing(unittest.TestCase):
+    def setUp(self):
+        # The code under test reads its config from the bags.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
+
     def _new_scheduler(self, disaggregation_mode: DisaggregationMode) -> Scheduler:
         scheduler = Scheduler.__new__(Scheduler)
         scheduler.disaggregation_mode = disaggregation_mode
@@ -91,6 +98,12 @@ class TestDisaggregationPriorityQueueing(unittest.TestCase):
 
 
 class TestDecodePreallocQueuePriority(unittest.TestCase):
+    def setUp(self):
+        # The code under test reads its config from the bags.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
+
     def _new_decode_req(self, rid: str, priority: int, *, failed: bool = False):
         req = SimpleNamespace(
             rid=rid,
@@ -227,6 +240,12 @@ class TestDecodePreallocQueueRebootstrapPayload(unittest.TestCase):
     dispatch itself now lives on the kv manager (see
     ``TestCommonKVManagerPrefillRecompute``)."""
 
+    def setUp(self):
+        # The code under test reads its config from the bags.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
+
     def _sampling_params(self):
         return SimpleNamespace(
             temperature=0.0,
@@ -286,6 +305,12 @@ class TestCommonKVManagerPrefillRecompute(unittest.TestCase):
     ``KVPoll.Failed`` so the scheduler's normal transfer-failure streaming runs.
     """
 
+    def setUp(self):
+        # The code under test reads its config from the bags.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
+
     def _new_manager(self):
         from sglang.srt.disaggregation.common.conn import CommonKVManager
 
@@ -423,6 +448,12 @@ class TestCommonKVManagerPrefillRecompute(unittest.TestCase):
 
 
 class TestDecodePrebuilt(unittest.TestCase):
+    def setUp(self):
+        # The code under test reads its config from the bags.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
+
     def _new_scheduler(self, *, enable_overlap: bool) -> Scheduler:
         scheduler = Scheduler.__new__(Scheduler)
         scheduler.grammar_manager = MagicMock()

test/registered/unit/mem_cache/test_hisparse_allocator.py

@@ -10,7 +10,8 @@ from sglang.srt.managers.schedule_batch import ReqKvInfo
 from sglang.srt.mem_cache.allocator.hisparse import (
     DeepSeekV4HiSparseTokenToKVPoolAllocator,
 )
-from sglang.srt.runtime_context import get_context
+from sglang.srt.runtime_context import get_context, publish, reset_context
+from sglang.srt.server_args import ServerArgs
 from sglang.test.ci.ci_register import register_cpu_ci
 from sglang.test.test_utils import CustomTestCase
 
@@ -18,6 +19,12 @@ register_cpu_ci(est_time=10, suite="base-a-test-cpu")
 
 
 class TestDeepSeekV4HiSparseAllocator(CustomTestCase):
+    def setUp(self):
+        # The code under test reads its config from the bags.
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="tokenizer")
+
     def test_forwards_swa_tail_allocation_to_logical_allocator(self):
         allocator = object.__new__(DeepSeekV4HiSparseTokenToKVPoolAllocator)
         logical_allocator = MagicMock(spec=["alloc_extend_swa_tail"])

test/registered/unit/models/test_qwen3_vl_feature_materialization.py

@@ -12,6 +12,7 @@ from sglang.srt.multimodal.processors.qwen_vl import QwenVLImageProcessor
 from sglang.srt.multimodal.transport.cuda_ipc import (
     DEFER_CUDA_IPC_FEATURE_RECONSTRUCTION_KEY,
 )
+from sglang.srt.runtime_context import get_context
 from sglang.test.ci.ci_register import register_cpu_ci
 from sglang.test.test_utils import CustomTestCase
 
@@ -33,6 +34,15 @@ class _RecordingVisual:
 
 
 class TestQwen3VLFeatureMaterialization(CustomTestCase):
+    def setUp(self):
+        # The transport decision is read from the `mm` bag.
+        from sglang.srt.runtime_context import publish, reset_context
+        from sglang.srt.server_args import ServerArgs
+
+        reset_context()
+        self.addCleanup(reset_context)
+        publish(ServerArgs(model_path="dummy"), role="test")
+
     @staticmethod
     def _model(visual, *, use_data_parallel):
         model = Qwen3VLForConditionalGeneration.__new__(Qwen3VLForConditionalGeneration)
@@ -43,10 +53,15 @@ class TestQwen3VLFeatureMaterialization(CustomTestCase):
 
     def test_processor_defers_gpu_transport_for_encoder_dp(self):
         for transport in ("cuda_ipc", "cuda_vmm"):
-            with self.subTest(transport=transport):
+            # `mm_enable_dp_encoder` is read through `get_mm()` now, so stating
+            # it on the processor's own `server_args` no longer reaches the
+            # code under test.
+            with (
+                self.subTest(transport=transport),
+                get_context().override_server_args(mm_enable_dp_encoder=True),
+            ):
                 processor = QwenVLImageProcessor.__new__(QwenVLImageProcessor)
                 processor.mm_feature_transport = transport
-                processor.server_args = SimpleNamespace(mm_enable_dp_encoder=True)
                 processor.model_type = "qwen3_vl"
                 items = [
                     MultimodalDataItem(modality=Modality.IMAGE),

test/registered/unit/multimodal/rust/qwen/_fixtures.py

@@ -94,6 +94,11 @@ def make_processor(case, config, image_processor_cls=None):
     publish(
         ServerArgs(
             model_path="dummy",
+            # Mirrored for the same reason the stub sets it: `get_mm_processor_cls`
+            # reads `model_impl` from this bag now, and "auto" would send it into
+            # `get_resolved_model_impl`, which chokes on the SimpleNamespace
+            # `model_config` these tests hand it.
+            model_impl=server_args.model_impl,
             mm_feature_transport=server_args.mm_feature_transport,
             mm_process_config=server_args.mm_process_config,
             allowed_media_domains=server_args.allowed_media_domains,

test/registered/unit/multimodal/rust/shared/test_rust_mm_gate.py

@@ -20,7 +20,9 @@ from sglang.srt.managers.multimodal_processor import (  # noqa: E402
     get_mm_processor_cls,
     import_processors,
 )
+from sglang.srt.runtime_context import publish
 from sglang.srt.rust_server.multimodal import rust_mm_family_for  # noqa: E402
+from sglang.srt.server_args import ServerArgs
 
 register_cpu_ci(est_time=14, suite="base-a-test-cpu")
 
@@ -28,7 +30,10 @@ register_cpu_ci(est_time=14, suite="base-a-test-cpu")
 def processor_cls_for(architecture, model_type):
     """Through the production selection, as `resolve_spec` calls it."""
     hf_config = SimpleNamespace(architectures=[architecture], model_type=model_type)
-    return get_mm_processor_cls(hf_config, SimpleNamespace(model_impl="sglang"))
+    # `model_impl` is read from the bags now, so it has to be published rather
+    # than handed over on a stand-in.
+    publish(ServerArgs(model_path="dummy", model_impl="sglang"), role="tokenizer")
+    return get_mm_processor_cls(hf_config)
 
 
 class TestRustMmGate(CustomTestCase):

test/registered/unit/multimodal/test_processor_device_selection.py

@@ -12,6 +12,7 @@ from types import SimpleNamespace
 from unittest.mock import patch
 
 from sglang.srt.multimodal.processors.base_processor import BaseMultimodalProcessor
+from sglang.srt.runtime_context import publish, reset_context
 from sglang.srt.server_args import ServerArgs
 from sglang.test.ci.ci_register import register_cpu_ci
 from sglang.test.test_utils import CustomTestCase
@@ -31,12 +32,25 @@ class _StubProcessor(BaseMultimodalProcessor):
 
 
 def _make(**fields):
+    """Both surfaces, because the device decision reads both.
+
+    `base_gpu_id` is the instance's own -- two engines in one process keep
+    different ones, which `test_publishing_another_config_does_not_move_the_device`
+    pins -- so it stays on the record the processor holds. `rl_on_policy_target`
+    is the process's, so it is published.
+    """
+    server_args = ServerArgs(model_path="dummy", **fields)
+    publish(server_args, role="tokenizer")
     processor = _StubProcessor.__new__(_StubProcessor)
-    processor.server_args = ServerArgs(model_path="dummy", **fields)
+    processor.server_args = server_args
     return processor
 
 
 class TestFastImageProcessorDevice(CustomTestCase):
+    def setUp(self):
+        reset_context()
+        self.addCleanup(reset_context)
+
     def _device(self, processor, **platform):
         flags = {"_is_cpu": False, "_is_xpu": False, "_is_npu": False}
         flags.update(platform)
@@ -80,6 +94,10 @@ class TestFastImageProcessorDevice(CustomTestCase):
 
 
 class TestFastImageProcessorMemoryPool(CustomTestCase):
+    def setUp(self):
+        reset_context()
+        self.addCleanup(reset_context)
+
     def _processor(self, *, transport="cpu", precompute_hash=False):
         processor = _make(base_gpu_id=0)
         processor.mm_feature_transport = transport