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How to give better performance, hybrid OpenMP/MPI or pure MPI? #733

Answered by EdwardSnyder-NOAA
lo-y-wni asked this question in Q&A
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Good afternoon Yi-Chuan,

Given that you are using 144 total processors, we expect little performance variations using different MPI/OpenMP configurations. We tend to see more performance variations or improvements between MPI/OpenMP configurations when using 1,000 processors or more. Our test experiments tend to have a consistent configuration based on the experiments grid, which can be found here: ufs-srweather-app/ush/predef_grid_params.yaml. For your situation, any valid configuration would be sufficient. But if you are interested in finding the most efficient settings, that would require running a series of experiments with different configurations and comparing the results. Also, kee…

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