refactor: trim memory.

Author: liqiang-fit2cloud

apps/maxkb/settings/mem.py

@@ -5,14 +5,22 @@
 from maxkb.const import CONFIG
 from common.utils.logger import maxkb_logger
 import random
+import psutil
 
 CURRENT_PID=os.getpid()
 # 1 hour
 GC_INTERVAL = 3600
 
 def enable_force_gc():
+    before = int(psutil.Process(CURRENT_PID).memory_info().rss / 1024 / 1024)
     collected = gc.collect()
-    maxkb_logger.debug(f"(PID: {CURRENT_PID}) Forced GC ({collected} objects collected)")
+    try:
+        import ctypes
+        ctypes.CDLL("libc.so.6").malloc_trim(0)
+    except Exception:
+        pass
+    after = int(psutil.Process(CURRENT_PID).memory_info().rss / 1024 / 1024)
+    maxkb_logger.debug(f"(PID: {CURRENT_PID}) Forced GC ({collected} objects and {before - after} MB recycled)")
     t = threading.Timer(GC_INTERVAL - random.randint(0, 900), enable_force_gc)
     t.daemon = True
     t.start()