asmushetzel commented on issue #8456: setting OMP_NUM_THREADS doesn't improve performance with MKL2017 URL: https://github.com/apache/incubator-mxnet/issues/8456#issuecomment-355293256 MKL does multithreading internally (also based on openmp, but not controlled by above environment variable). It has its own internal mechanism for controlling thread numbers, where the default is to use maximum number. So in essence: When you link with MKL, all MKL calls are anyway maximally threaded internally.
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