ctcyang commented on issue #11237: Bring back MXNET_GPU_COPY_NTHREADS env 
variable
URL: https://github.com/apache/incubator-mxnet/pull/11237#issuecomment-396778091
 
 
   When it's set to 1, copies between GPUs are serialized. Even between 2 GPUs, 
if GPU 0 is currently sending something to 1 on one stream, and GPU 1 wants to 
send something to 0, the latter send will have to wait leaving the 1 -> 0 link 
under-utilized.

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