kpuatamazon 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-612836744 Single-threaded benchmarks (`OMP_NUM_THREADS=1`) to confirm that it's not a difference in OMP library: | Shape | dot (MKL) | FullyConnected (MKL workaround) | FullyConnected (DNNL) | DNNL slowdown | | --- | --- | --- | --- | --- | | 5, 512, 512 | 0.0000914 | 0.0001016 | 0.0002448 | 2.40x | | 5, 512, 1536 | 0.0002939 | 0.0003051 | 0.0006576 | 2.15x | | 5, 512, 2048 | 0.0003828 | 0.0003919 | 0.0008582 | 2.18x | | 5, 2048, 512 | 0.0003681 | 0.0003785 | 0.0014638 | 3.86x | | 4, 512, 512 | 0.0000917 | 0.0001038 | 0.0002364 | 2.27x |
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