If using the APMPI module, users can additionally specify the `--enable-apmpi-coll-sync` configure option to force Darshan to synchronize before calling underlying MPI routines and to capture additional timing information on how synchronized processes are. Users should note this option will impose additional overheads, but can be useful to help diagnose whether applications are spending a lot of time synchronizing as part of collective communication calls. For this reason, we do not recommend users setting this particular option for production Darshan deployments.
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