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  • #268

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Opened Feb 12, 2020 by Philip Carns@carns
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first I/O time graph in darshan-job-summary can be misleading if not all ranks perform I/O

benchio_1202.darshan

File to use as a reproducer is attached, but the issue should be visible from any parallel application doing I/O from rank 0 (or any other subset of ranks). The first graph shows "Average I/O cost per process", which will look low on those apps because it amortizes I/O time across ranks that aren't doing I/O.

It would probably be more intuitive to show slowest_rank_time/run_time instead, so we show the percentage of time spent in I/O on the worst case rank rather than average across all ranks regardless of whether they participate or not.

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darshan-job-summary.pl
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Reference: darshan/darshan#268