[diffusion] log: improve logging while multiprocessing (#12997)

python/sglang/multimodal_gen/runtime/utils/hf_diffusers_utils.py

@@ -34,7 +34,10 @@ from huggingface_hub import snapshot_download
 from transformers import AutoConfig, PretrainedConfig
 from transformers.models.auto.modeling_auto import MODEL_FOR_CAUSAL_LM_MAPPING_NAMES
 
-from sglang.multimodal_gen.runtime.utils.logging_utils import init_logger
+from sglang.multimodal_gen.runtime.utils.logging_utils import (
+    init_logger,
+    suppress_other_loggers,
+)
 
 logger = init_logger(__name__)
 _CONFIG_REGISTRY: dict[str, type[PretrainedConfig]] = {
@@ -370,7 +373,9 @@ def maybe_download_model(
         logger.info(
             "Downloading model snapshot from HF Hub for %s...", model_name_or_path
         )
-        with get_lock(model_name_or_path).acquire(poll_interval=2):
+        with get_lock(model_name_or_path).acquire(
+            poll_interval=2
+        ), suppress_other_loggers(not_suppress_on_main_rank=True):
             local_path = snapshot_download(
                 repo_id=model_name_or_path,
                 ignore_patterns=["*.onnx", "*.msgpack"],