Hello All, I'm having some difficulty understanding how performance should differ between independent and collective IO.
At the moment, I'm trying to write regular hyperslabs that span an entire 40GB dataset (writing to lustre, Intel MPI). Independent IO seems to be quite a bit faster (30 second difference on 64 machines). What factors might be contributing to this difference in performance? Also, in both cases I seem to be getting a strange slowdown at 32 machines. In almost all my tests, 16 and 64 machines both perform better than 32. Thanks! David
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