Added env variable control

Author: cehongwang

py/torch_tensorrt/dynamo/utils.py

@@ -3,6 +3,7 @@
 import ctypes
 import gc
 import logging
+import os
 import platform
 import warnings
 from dataclasses import fields, replace
@@ -882,7 +883,7 @@ def release_memory() -> None:
         torch.cuda.ipc_collect()
         torch.cuda.synchronize()
 
-    if platform.system() == "Linux":
+    if platform.system() == "Linux" and os.environ.get("TRIM_CPU_MEMORY", "0") == "1":
         try:
             libc = ctypes.CDLL("libc.so.6")
             if libc.malloc_trim(0) != 1: