sxjscience 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_r174294274
 
 

 ##########
 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:
   So we cannot use kernel::launch together with shared memory?

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