cjolivier01 commented on a change in pull request #10090: [MXNET-86] Revert to 
pre-profile-changes copy code
URL: https://github.com/apache/incubator-mxnet/pull/10090#discussion_r174304792
 
 

 ##########
 File path: src/ndarray/ndarray_function.cc
 ##########
 @@ -26,35 +26,24 @@
 #include "./ndarray_function.h"
 #include "./ndarray_function-inl.h"
 #include "../common/utils.h"
-#include "../operator/mxnet_op.h"
 
 namespace mxnet {
 namespace ndarray {
 template<>
 void Copy<cpu, cpu>(const TBlob &from, TBlob *to,
                     Context from_ctx, Context to_ctx,
                     RunContext ctx) {
-  using namespace mxnet::op;
   MSHADOW_TYPE_SWITCH(to->type_flag_, DType, {
     if (to->type_flag_ == from.type_flag_) {
-      TBlob dest = to->FlatTo1D<cpu, DType>();
-      TBlob src = from.FlatTo1D<cpu, DType>();
-      const size_t size = src.Size();
-      if (dest.CheckContiguous() && src.CheckContiguous() && size >= 20000 /* 
non-trivial size */) {
-        CHECK_EQ(dest.shape_, src.shape_)
-          << "Copy:shape mismatch:" << dest.shape_ << " vs " << src.shape_;
-          mxnet_op::Kernel<mxnet_op::op_with_req<mshadow_op::identity, 
kWriteTo>, cpu>::Launch(
-            ctx.get_stream<cpu>(), src.Size(), dest.dptr<DType>(), 
src.dptr<DType>());
 
 Review comment:
   ```cpp
   /*
       Reset the library so execution in the child starts "all over again" with
       clean data structures in initial states.  Don't worry about freeing 
memory
       allocated by parent, just abandon it to be safe.
   */
   static void
   __kmp_atfork_child (void)
   {
   ```

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