[petsc-users] Should I synchronize processes explicitly, for instance using MPI_Barrier?

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:
> Never put in a barrier.

Barriers serve no functional or correctness purpose in a
properly-written pure-MPI code.  They are sometimes useful for debugging
and sometimes necessary if you use despicable hacks like communicating
through a side channel such as the file system.  If you're not putting
yourself into that unenviable position, don't use barriers.
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