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Multi-rail InfiniBand #34

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tbiedert opened this issue Feb 1, 2020 · 0 comments

tbiedert commented Feb 1, 2020 •

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Does Microsoft MPI support multi-rail on InfiniBand?

On Linux, you can use OpenMPI + UCX.

On a dual Mellanox ConnectX-6 setup, I get the following bandwith benchmark results:

Windows - Microsoft MPI (with zero copy enabled): 11 GB/sec
Linux - OpenMPI/UCX (with UCX_MAX_RNDV_RAILS=4): 48 GB/sec

Thanks!

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