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Issue created by Philip Carns@carnsOwner

don't plot negative mmap counter values in darshan-job-summary.pl

darshan-negative-mmap

The mmap counters can be set to negative values for a given file record to indicate that mmap wrappers are disabled (this is normal). Darshan-job-summary.pl still attempts to plot the values in some cases, though, see attached screenshot. We should set the value to zero in darshan-job-summary.pl for plotting clarity.