Disable cuda malloc by default.

cuda_malloc.py

@@ -2,6 +2,7 @@ import os
 import importlib.util
 from comfy.cli_args import args
 import subprocess
+import logging
 
 #Can't use pytorch to get the GPU names because the cuda malloc has to be set before the first import.
 def get_gpu_names():
@@ -63,7 +64,7 @@ def cuda_malloc_supported():
     return True
 
 
-if not args.cuda_malloc:
+if args.cuda_malloc:
     try:
         version = ""
         torch_spec = importlib.util.find_spec("torch")
@@ -74,8 +75,11 @@ if not args.cuda_malloc:
                 module = importlib.util.module_from_spec(spec)
                 spec.loader.exec_module(module)
                 version = module.__version__
+        supported = False
         if int(version[0]) >= 2: #enable by default for torch version 2.0 and up
-            args.cuda_malloc = cuda_malloc_supported()
+            supported = cuda_malloc_supported()
+        if not supported:
+            logging.warning("WARNING: cuda malloc enabled but not supported.")
     except:
         pass