emfomenk commented on issue #17980: When compiled with MKL, fully_connected calls DNNL while dot and batch_dot call MKL URL: https://github.com/apache/incubator-mxnet/issues/17980#issuecomment-610441396 > Do you think that enabling this option can improve the performance of inner product primitive for the above cases? @TaoLv, yes, this could be. Two reasons for that: 1. If Intel MKL is linked, then most likely `libiomp5.so` will be used instead of `libgomp.so`. So, if you see the performance difference, I would suggest to test Intel MKL-DNN v1.0 / DNNL v1.1+ with `LD_PRELOAD=libiomp5.so`, just to confirm that the issue due to or not due to OpenMP run-time. 2. Performance bug in Intel MKL-DNN v1.0 / DNNL v1.1+. We definitely fixed few performance issues in the library since v1.0. I would also suggest to try upgrading the library to the most recent version and check the performance. I strongly suggest not using this developer's option. It is unsupported, not tested, and as I said, it is most likely broken in the subsequent releases.
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