Matthew Overholt <[email protected]> writes: > Barry, > > Subsequent tests with the same code and a problem (input) having a much > smaller vertex (equation) count (i.e. a much smaller matrix to invert for > the solution) have NOT had PetscCommDuplicate() account for any significant > time, so I'm not surprised that your test didn't find any problem.
Can you re-run the large and small configurations with the same code/environment and resend those logs? PetscCommDuplicate has nothing to do with the problem size, so any difference in cost must be indirect, though attribute access should be simple and independent.
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