[GitHub] [incubator-mxnet] wkcn commented on issue #14610: [Feature Request] Disable lazy evaluation

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

wkcn commented on issue #14610: [Feature Request] Disable lazy evaluation
URL: https://github.com/apache/incubator-mxnet/issues/14610#issuecomment-479459608
 
 
   I wrote a test case:
   ```python
   import mxnet as mx
   import time
   
   N = 4000
   a = mx.nd.zeros((N, N))
   b = mx.nd.zeros((N, N))
   while 1:
       tic = time.time()
       c = mx.nd.dot(a, b)
       # time.sleep(5)
       tic2 = time.time()
       c.wait_to_read()
       print("wait_to_read", time.time() - tic2)
       print(time.time() - tic)
   ```
   
   The output is as follow:
   ```
   ('wait_to_read', 2.236266851425171)                                                                                           
   2.23689508438
   ('wait_to_read', 2.1589441299438477)
   2.15961289406
   ('wait_to_read', 2.1335580348968506)
   2.13375878334
   ```
   It takes about 2 seconds to execute all operators.
   
   However, after uncommenting `time.sleep(5)`, there is the output:
   ```
   ('wait_to_read', 6.985664367675781e-05)
   5.00382494926
   ('wait_to_read', 2.384185791015625e-05)
   5.00761890411
   ('wait_to_read', 2.5987625122070312e-05)
   5.0087518692
   ```
   
   It shows that `wait_to_read` spent `2e-5` seconds.
   When does the operators execute?

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