server: log the process occupying our port (#866)

aphrodite/common/utils.py

@@ -557,6 +557,16 @@ def get_open_port(port: Optional[int] = None) -> int:
             return s.getsockname()[1]
 
 
+def find_process_using_port(port: int) -> Optional[psutil.Process]:
+    for conn in psutil.net_connections():
+        if conn.laddr.port == port:
+            try:
+                return psutil.Process(conn.pid)
+            except psutil.NoSuchProcess:
+                return None
+    return None
+
+
 def update_environment_variables(envs: Dict[str, str]):
     for k, v in envs.items():
         if k in os.environ and os.environ[k] != v:

aphrodite/server/launch.py

@@ -8,7 +8,7 @@
 from fastapi import FastAPI, Response
 from loguru import logger
 
-from aphrodite.common.utils import in_windows
+from aphrodite.common.utils import find_process_using_port, in_windows
 from aphrodite.engine.async_aphrodite import AsyncEngineDeadError
 from aphrodite.engine.protocol import AsyncEngineClient
 
@@ -47,6 +47,12 @@ async def dummy_shutdown() -> None:
         await server_task
         return dummy_shutdown()
     except asyncio.CancelledError:
+        port = uvicorn_kwargs["port"]
+        process = find_process_using_port(port)
+        if process is not None:
+            logger.debug(
+                f"port {port} is used by process {process} launched with "
+                f"command:\n{' '.join(process.cmdline())}")
         logger.info("Gracefully stopping http server")
         return server.shutdown()