[GitHub] [incubator-mxnet] anirudhacharya commented on issue #12128: NaiveEngine is not threadsafe and crashes when called from multiple threads.

[GitBox <gi...@apache.org>]

anirudhacharya commented on issue #12128: NaiveEngine is not threadsafe and crashes when called from multiple threads.
URL: https://github.com/apache/incubator-mxnet/issues/12128#issuecomment-470253776
 
 
   The following code runs fine when run with `MXNET_ENGINE_TYPE=NaiveEngine`
   
   ```python
   import threading
   import mxnet as mx
   
   def worker(module, input1, input2, lock,  outputs):
       o1 = mx.nd.broadcast_add(input1, input2)
       o2 = mx.nd.broadcast_mul(o1, input1)
       o3 = mx.nd.broadcast_mul(input2, o2) 
       outnd = o2 + o3
       outnd.wait_to_read()
       with lock:
           outputs.append(outnd)
   
   threads = []
   outputs = []
   lock = threading.Lock()
   for i in range(3):
       thread = threading.Thread(target=worker, args=(net, mx.random.randn(1, 3, 10), mx.random.randn(1, 3, 10), lock, outputs))
       threads.append(thread)
                                                                                                                                                                   
   for thread in threads:
       thread.start()
   for thread in threads:
       thread.join()
   
   for i in  outputs:
       print(i)
   ```
   
   I think we can close this issue unless the author still has pending concerns.

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