kill serve lead to kill sched and engine

ktransformers/server/backend/interfaces/balance_serve.py

@@ -46,6 +46,8 @@ import pickle
 import subprocess
 import tempfile
 import atexit
+import signal
+
 
 ktransformer_rules_dir = (
     os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "..", "..", "./optimize/optimize_rules/") 
@@ -55,6 +57,7 @@ default_optimize_rules = {
     "Qwen2MoeForCausalLM": ktransformer_rules_dir + "Qwen2-57B-A14B-Instruct-serve.yaml",
 }
 
+
 async def chat_stream(queue: asyncio.Queue, tokenizer: AutoTokenizer):
     streamer = TextStreamer(tokenizer)
     while True:
@@ -293,10 +296,6 @@ class BalanceServeInterface(BackendInterfaceBase):
         kvcache_event.wait()
 
 
-        def cleanup():
-            if sched_process.poll() is None:
-                sched_process.terminate()
-
         with tempfile.NamedTemporaryFile(delete=False) as temp_file:
             pickle.dump(args, temp_file)
             temp_file_path = temp_file.name
@@ -311,7 +310,27 @@ class BalanceServeInterface(BackendInterfaceBase):
             stderr=log
         )
         print("sched_rpc started with PID:", sched_process.pid)
-        atexit.register(cleanup)
+
+        def signal_handler(signum, frame):
+            print(f"Received signal {signum}, shutting down...")
+            cleanup()
+            os._exit(0) 
+
+        def cleanup():
+            print("Cleaning up...")
+
+            for p in processes:
+                if p.is_alive():
+                    print(f"Terminating subprocess {p.pid}")
+                    p.terminate()
+                    p.join()
+
+            if sched_process and sched_process.poll() is None:
+                print(f"Terminating sched_process {sched_process.pid}")
+                sched_process.terminate()
+                sched_process.wait()
+        signal.signal(signal.SIGINT, signal_handler)   
+        signal.signal(signal.SIGTERM, signal_handler)
 
         start_event.wait()