Only two devices can be used at the same time. Try to add "-x MXM_IB_PORTS=mlx4_N", just replace N, to mpirun command line and see if it improves results.
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Only two devices can be used at the same time. Try to add "-x MXM_IB_PORTS=mlx4_N", just replace N, to mpirun command line and see if it improves results.