lichen11 commented on issue #5296: KVStore error with certain optimizer 
settings - R-package
URL: 
https://github.com/apache/incubator-mxnet/issues/5296#issuecomment-461612944
 
 
   Using local_allreduce_device works now. Thank you!
   I am receiving the following message. Is it something worth being concerned 
with?
   [21:46:21] src/kvstore/././comm.h:744: only 0 out of 2 GPU pairs are enabled 
direct access. It may affect the performance. You can set 
MXNET_ENABLE_GPU_P2P=0 to turn it off

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