Update app.py

app.py

@@ -252,9 +252,13 @@ class BackendProcessor:
         threading.Thread(target=_background, daemon=True).start()
 
 # Initialize logger early for startup functions
-logging.basicConfig(level=logging.INFO, format='%(asctime)s - ZEROENGINE - %(message)s')
+logging.basicConfig(level=logging.INFO, format='%(asctime)s - ZEROENGINE - %(message)s', force=True)
 logger = logging.getLogger(__name__)
 
+# Suppress asyncio warnings during shutdown
+import warnings
+warnings.filterwarnings("ignore", category=RuntimeWarning, message=".*asyncio.*")
+
 # --- KERNEL INITIALIZATION ---
 try:
     from llama_cpp import Llama
@@ -1875,9 +1879,11 @@ if __name__ == "__main__":
         logger.info("[CLEANUP] Starting graceful shutdown...")
         
         # Stop passive GC first
+        logger.info("[CLEANUP] Stopping passive GC...")
         stop_passive_gc()
         
         # Cleanup kernel resources
+        logger.info("[CLEANUP] Cleaning up kernel resources...")
         if kernel and kernel.llm:
             try:
                 del kernel.llm
@@ -1887,20 +1893,27 @@ if __name__ == "__main__":
                 logger.error(f"[CLEANUP] Model cleanup error: {e}")
         
         # Final garbage collection with asyncio cleanup
+        logger.info("[CLEANUP] Performing final cleanup...")
         try:
             import asyncio
             # Close any remaining event loops
             try:
+                loops = asyncio.all_tasks()
+                logger.info(f"[CLEANUP] Found {len(loops)} asyncio tasks")
+                
                 loop = asyncio.get_event_loop()
                 if loop and not loop.is_closed():
+                    logger.info("[CLEANUP] Closing event loop...")
                     loop.close()
+                    logger.info("[CLEANUP] Event loop closed")
             except RuntimeError:
-                # No event loop or already closed
-                pass
+                logger.info("[CLEANUP] No event loop to close")
             
             # Final GC
-            for _ in range(3):
-                gc.collect(2)
+            logger.info("[CLEANUP] Running final garbage collection...")
+            for i in range(3):
+                collected = gc.collect(2)
+                logger.info(f"[CLEANUP] GC pass {i+1}: {collected} objects collected")
             logger.info("[CLEANUP] Final GC complete")
         except Exception as e:
             logger.error(f"[CLEANUP] Final GC error: {e}")