wkcn edited a comment on issue #11913: Unexpectedly poor copy() performance URL: https://github.com/apache/incubator-mxnet/issues/11913#issuecomment-409904550 @safrooze Yes. I modified the code then reported the result. Here is the code I modified. ``` a = nd.empty((1, 512, 120*120)) nd.waitall() start = time() for _ in range(2000): b = a.copy() nd.waitall() print('\tcopy: elapsed: {:.2f}'.format(time() - start)) start = time() for _ in range(2000): b = a + 0.0 nd.waitall() print('\tcopy via add: elapsed: {:.2f}'.format(time() - start)) ``` And I test the code you provided, copy: elapsed: 2.69 copy via add: elapsed: 4.31 The reason that I changed the code is that the computation of NDArray is lazy. The script `b = a + 0.0` only records this operation but there is no actual computation until `nd.waitall` is called.
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