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Old 2019-03-22, 11:48   #3
jasonp
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Oct 2004

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The existing CUDA code is definitely not MPI aware; MPI processes can each use a GPU for a smaller matrix multiply but data transfers to/from GPU would be required for every such operation. I've never even tried using it so the odds are 100% that it is broken.

A better implementation would host the data buffers on GPU at all times and do direct copies from one GPU to another. Latter-day CUDA makes this possible but it has to be explicitly set up.
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