[petsc-users] large PetscCommDuplicate overhead

[Jed Brown]

Matthew Overholt <overholt at capesim.com> 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.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 800 bytes
Desc: not available
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20161011/77fc6879/attachment-0001.pgp>