minke.yu/sglang
1
0
Fork 0
Code Issues Pull Requests Actions 13 Packages Projects Releases Wiki Activity

[FlashInfer v0.6.10] [RL] [DSv32] [GLM-5] Add --dsa-topk-backend and integrate FlashInfer and pytorch topk (#22851)

Browse Source
This commit is contained in:
Ziang Li
2026-05-25 13:08:03 -07:00
committed by GitHub
parent b13d3d18c6
commit 2b9dd9c8b3
9 changed files with 706 additions and 54 deletions
Download Patch File Download Diff File Expand all files Collapse all files
docs/advanced_features/server_arguments.md
+1
View File
@@ -273,6 +273,7 @@ Please consult the documentation below and [server_args.py](https://github.com/s
| `--mm-attention-backend` | Set multimodal attention backend. | `None` | `sdpa`, `fa3`, `fa4`, `triton_attn`, `ascend_attn`, `aiter_attn` |
| `--dsa-prefill-backend` | Choose the DSA backend for the prefill stage (overrides `--attention-backend` when running DeepSeek DSA-style attention). `--nsa-prefill-backend` is a deprecated alias. | `flashmla_sparse` | `flashmla_sparse`, `flashmla_kv`, `flashmla_auto`, `fa3`, `tilelang`, `aiter`, `trtllm` |
| `--dsa-decode-backend` | Choose the DSA backend for the decode stage when running DeepSeek DSA-style attention. Overrides `--attention-backend` for decoding. `--nsa-decode-backend` is a deprecated alias. | `fa3` | `flashmla_sparse`, `flashmla_kv`, `fa3`, `tilelang`, `aiter`, `trtllm` |
| `--dsa-topk-backend` | Choose the DSA indexer top-k backend. The `torch` backend currently requires `SGLANG_DSA_FUSE_TOPK=false`. | `sgl-kernel` | `sgl-kernel`, `torch`, `flashinfer` |
| `--fp8-gemm-backend` | Choose the runner backend for Blockwise FP8 GEMM operations. Options: 'auto' (default, auto-selects based on hardware), 'deep_gemm' (JIT-compiled; enabled by default on NVIDIA Hopper (SM90) and Blackwell (SM100) when DeepGEMM is installed), 'flashinfer_trtllm' (FlashInfer TRTLLM backend; SM100/SM103 only), 'flashinfer_cutlass' (FlashInfer CUTLASS backend, SM120 only), 'flashinfer_deepgemm' (Hopper SM90 only, uses swapAB optimization for small M dimensions in decoding), 'cutlass' (optimal for Hopper/Blackwell GPUs and high-throughput), 'triton' (fallback, widely compatible), 'aiter' (ROCm only).| `auto` | `auto`, `deep_gemm`, `flashinfer_trtllm`, `flashinfer_cutlass`, `flashinfer_deepgemm`, `cutlass`, `triton`, `aiter` |
| `--fp4-gemm-backend` | Choose the runner backend for NVFP4 GEMM operations. Options: 'flashinfer_cutlass' (default), 'auto' (auto-selects between flashinfer_cudnn/flashinfer_cutlass based on CUDA/cuDNN version), 'flashinfer_cudnn' (FlashInfer cuDNN backend, optimal on CUDA 13+ with cuDNN 9.15+), 'flashinfer_trtllm' (FlashInfer TensorRT-LLM backend, requires different weight preparation with shuffling). All backends are from FlashInfer; when FlashInfer is unavailable, sgl-kernel CUTLASS is used as an automatic fallback.| `flashinfer_cutlass` | `auto`, `flashinfer_cudnn`, `flashinfer_cutlass`, `flashinfer_trtllm` |
| `--disable-flashinfer-autotune` | Flashinfer autotune is enabled by default. Set this flag to disable the autotune. | `False` | bool flag (set to enable) |
docs/references/environment_variables.md
+2
View File
@@ -95,6 +95,8 @@ SGLang supports various environment variables that can be used to configure its
| Environment Variable | Description | Default Value |
| --- | --- | --- |
| `SGLANG_DSA_FUSE_TOPK` | Fuse the operation of picking topk logits and picking topk indices from page table (`SGLANG_NSA_FUSE_TOPK` is a deprecated alias) | `true` |
| `SGLANG_DSA_TOPK_FLASHINFER_DETERMINISTIC` | Use deterministic FlashInfer topk kernels when `--dsa-topk-backend=flashinfer` | `false` |
| `SGLANG_DSA_TOPK_FLASHINFER_TIE_BREAK` | Tie-break mode for FlashInfer DSA topk when `--dsa-topk-backend=flashinfer`: unset disables explicit tie-breaking, `small` prefers the smaller candidate index for equal scores, and `large` prefers the larger candidate index for equal scores. Setting this variable makes FlashInfer use deterministic topk. | `unset` |
| `SGLANG_DSA_ENABLE_MTP_PRECOMPUTE_METADATA` | Precompute metadata that can be shared among different draft steps when MTP is enabled (`SGLANG_NSA_ENABLE_MTP_PRECOMPUTE_METADATA` is a deprecated alias) | `true` |
| `SGLANG_USE_FUSED_METADATA_COPY` | Control whether to use fused metadata copy kernel for cuda graph replay | `true` |
| `SGLANG_DSA_PREFILL_DENSE_ATTN_KV_LEN_THRESHOLD` | When the maximum kv len in current prefill batch exceeds this value, the sparse mla kernel will be applied, else it falls back to dense MHA implementation. Default to the index topk of model (2048 for DeepSeek V3.2) (`SGLANG_NSA_PREFILL_DENSE_ATTN_KV_LEN_THRESHOLD` is a deprecated alias) | `2048` |