diff --git a/douzero/dmc/dmc.py b/douzero/dmc/dmc.py
index b791a38..eddbd26 100644
--- a/douzero/dmc/dmc.py
+++ b/douzero/dmc/dmc.py
@@ -166,12 +166,12 @@ def train(flags):
     for j in range(flags.num_actors_thread):
         for i in range(num_actors):
             infer_queues.append({
-                'input': ctx.Queue(), 'output': ctx.Queue()
+                'input': ctx.Queue(maxsize=100), 'output': ctx.Queue(maxsize=100)
             })
 
     infer_processes = []
     for device in flags.infer_devices.split(','):
-        for i in range(flags.num_infer):
+        for i in range(flags.num_infer if device != 'cpu' else 1):
             infer = mp.Process(
                 target=infer_logic,
                 args=(i, device, infer_queues, actor_model, flags, onnx_frame))