[fix] fix potential bumpy throughtput with deepgemm (#5722)

Author: Alcanderian

python/sglang/compile_deep_gemm.py

@@ -27,7 +27,7 @@
 multiprocessing.set_start_method("spawn", force=True)
 
 # Reduce warning
-os.environ["SGL_IN_DEEP_GEMM_PRE_COMPILE_STAGE"] = "1"
+os.environ["SGL_IN_DEEPGEMM_PRECOMPILE_STAGE"] = "1"
 # Force enable deep gemm
 os.environ["SGL_ENABLE_JIT_DEEPGEMM"] = "1"
 # Force enable mha chunked kv for DeepSeek V3 to avoid missing kv_b_proj DeepGEMM case

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

@@ -34,9 +34,10 @@
 _ENABLE_JIT_DEEPGEMM_PRECOMPILE = get_bool_env_var(
     "SGL_JIT_DEEPGEMM_PRECOMPILE", "true"
 )
-_DO_COMPILE = get_bool_env_var("SGL_IS_FIRST_RANK_ON_NODE", "true")
+_DO_COMPILE_ALL = True
+_IS_FIRST_RANK_ON_NODE = get_bool_env_var("SGL_IS_FIRST_RANK_ON_NODE", "true")
 _COMPILE_WORKERS = get_int_env_var("SGL_JIT_DEEPGEMM_COMPILE_WORKERS", 4)
-_IN_PRE_COMPILE_STAGE = get_bool_env_var("SGL_IN_DEEP_GEMM_PRE_COMPILE_STAGE", "false")
+_IN_PRECOMPILE_STAGE = get_bool_env_var("SGL_IN_DEEPGEMM_PRECOMPILE_STAGE", "false")
 
 # Force redirect deep_gemm cache_dir
 os.environ["DG_CACHE_DIR"] = os.getenv(
@@ -46,7 +47,8 @@
 
 def update_deep_gemm_config(gpu_id: int, server_args: ServerArgs):
     global _BUILTIN_M_LIST
-    global _DO_COMPILE
+    global _DO_COMPILE_ALL
+    global _IS_FIRST_RANK_ON_NODE
 
     # Generate m_max
     m_max = 1024 * 16
@@ -57,8 +59,13 @@ def update_deep_gemm_config(gpu_id: int, server_args: ServerArgs):
     m_max = min(1024 * 128, m_max)
     _BUILTIN_M_LIST = list(range(1, m_max + 1))
 
-    # Check if is the first rank on node
-    _DO_COMPILE = ServerArgs.base_gpu_id == gpu_id
+    _IS_FIRST_RANK_ON_NODE = ServerArgs.base_gpu_id == gpu_id
+
+    # Check if is the first rank on node.
+    # Default each rank will try compile all Ms to
+    # load all symbols at the launch stages.
+    # Avoid loading symbols at the serving stages.
+    _DO_COMPILE_ALL = _IS_FIRST_RANK_ON_NODE or not _IN_PRECOMPILE_STAGE
 
 
 class DeepGemmKernelType(IntEnum):
@@ -89,7 +96,7 @@ class DeepGemmKernelHelper:
 
 
 def _compile_warning_1():
-    if not _IN_PRE_COMPILE_STAGE:
+    if not _IN_PRECOMPILE_STAGE and _IS_FIRST_RANK_ON_NODE:
         logger.warning(
             "Entering DeepGEMM JIT Pre-Complie session. "
             "And it may takes a long time(Typically 10-20 mins) "
@@ -276,7 +283,7 @@ def _maybe_compile_deep_gemm_one_type_all(
     query_key = (kernel_type, n, k, num_groups)
     if (
         _ENABLE_JIT_DEEPGEMM_PRECOMPILE
-        and _DO_COMPILE
+        and _DO_COMPILE_ALL
         and _INITIALIZATION_DICT.get(query_key) is None
     ):
         _INITIALIZATION_DICT[query_key] = True
@@ -286,7 +293,7 @@ def _maybe_compile_deep_gemm_one_type_all(
         logger.info(
             f"Try DeepGEMM JIT Compiling for "
             f"<{kernel_helper.name}> N={n}, K={k}, num_groups={num_groups} with all Ms."
-            f"{' It only takes a litte time(Typically 1 sec) if you have run `sglang.compile_deep_gemm`. ' if not _IN_PRE_COMPILE_STAGE else ''}"
+            f"{' It only takes a litte time(Typically 1 sec) if you have run `sglang.compile_deep_gemm`. ' if not _IN_PRECOMPILE_STAGE else ''}"
         )
 
         # NOTE(alcanderian): get_num_sms should be change when 2-batch-overlap is introduced
@@ -355,7 +362,7 @@ def gemm_nt_f8f8bf16(
 
 @contextmanager
 def _log_jit_build(M: int, N: int, K: int, kernel_type: DeepGemmKernelType):
-    if _IN_PRE_COMPILE_STAGE:
+    if _IN_PRECOMPILE_STAGE:
         yield
         return