Fix stop_profile does not wait for finishing (#4741)

python/sglang/srt/entrypoints/engine.py

@@ -321,7 +321,8 @@ class Engine(EngineBase):
         loop.run_until_complete(self.tokenizer_manager.start_profile())
 
     def stop_profile(self):
-        self.tokenizer_manager.stop_profile()
+        loop = asyncio.get_event_loop()
+        loop.run_until_complete(self.tokenizer_manager.stop_profile())
 
     def get_server_info(self):
         loop = asyncio.get_event_loop()

python/sglang/srt/entrypoints/http_server.py

@@ -355,7 +355,7 @@ async def start_profile_async(obj: Optional[ProfileReqInput] = None):
 @app.api_route("/stop_profile", methods=["GET", "POST"])
 async def stop_profile_async():
     """Stop profiling."""
-    _global_state.tokenizer_manager.stop_profile()
+    await _global_state.tokenizer_manager.stop_profile()
     return Response(
         content="Stop profiling. This will take some time.\n",
         status_code=200,

python/sglang/srt/managers/scheduler.py

@@ -1512,7 +1512,7 @@ class Scheduler(
             self.profiler_target_forward_ct
             and self.profiler_target_forward_ct <= self.forward_ct
         ):
-            self.stop_profile()
+            self.send_to_tokenizer.send_pyobj(self.stop_profile())
 
         if self.forward_sleep_time is not None:
             logger.info(f"Scheduler.run_batch sleep {self.forward_sleep_time}s")
@@ -2114,7 +2114,10 @@ class Scheduler(
 
     def stop_profile(self) -> None:
         if self.profiler_activities is None:
-            return
+            return ProfileReqOutput(
+                success=False,
+                message="Profiling is not in progress. Call /start_profile first.",
+            )
 
         logger.info("Stop profiling...")
         if self.torch_profiler is not None:
@@ -2145,10 +2148,7 @@ class Scheduler(
         self.torch_profiler_output_dir = None
         self.profiler_activities = None
 
-        if self.profiler_target_forward_ct:
-            self.send_to_tokenizer.send_pyobj(
-                ProfileReqOutput(success=True, message="Succeeded.")
-            )
+        return ProfileReqOutput(success=True, message="Succeeded")
 
     def expert_distribution_handle(self, recv_req: ExpertDistributionReq):
         if recv_req == ExpertDistributionReq.START_RECORD:

python/sglang/srt/managers/tokenizer_manager.py

@@ -295,7 +295,7 @@ class TokenizerManager:
         self.flush_cache_communicator = _Communicator(
             self.send_to_scheduler, server_args.dp_size
         )
-        self.start_profile_communicator = _Communicator(
+        self.profile_communicator = _Communicator(
             self.send_to_scheduler, server_args.dp_size
         )
         self.health_check_communitcator = _Communicator(self.send_to_scheduler, 1)
@@ -360,7 +360,7 @@ class TokenizerManager:
                 ),
                 (
                     ProfileReqOutput,
-                    self.start_profile_communicator.handle_recv,
+                    self.profile_communicator.handle_recv,
                 ),
                 (
                     GetInternalStateReqOutput,
@@ -801,7 +801,14 @@ class TokenizerManager:
             record_shapes=record_shapes,
             profile_id=str(time.time()),
         )
-        result = (await self.start_profile_communicator(req))[0]
+        return await self._execute_profile(req)
+
+    async def stop_profile(self):
+        req = ProfileReq(type=ProfileReqType.STOP_PROFILE)
+        return await self._execute_profile(req)
+
+    async def _execute_profile(self, req: ProfileReq):
+        result = (await self.profile_communicator(req))[0]
         if not result.success:
             raise RuntimeError(result.message)
         return result