wkcn edited a comment on issue #11913: Unexpectedly poor copy() performance URL: https://github.com/apache/incubator-mxnet/issues/11913#issuecomment-413410094 @safrooze You are right. Sorry that I didn't know how many times the operator executes. I did a simple experiment [Code](https://gist.github.com/wkcn/63e11870c0d0e48e6fda95716b7171e4). It seems that the computation graph will not erased when reassign `b`. I ran your test on a server (28 cores), ``` copy: elapsed: 4.09 copy via add: elapsed: 0.39 ``` I think `copy via add` uses all cores, however `copy` uses restricted cores (less than all cores)
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