[petsc-users] Is PetscSFBcast deterministic (just checking, I assume it is)

Barry Smith bsmith at petsc.dev
Fri Jul 30 10:45:12 CDT 2021

   We might consider having a universal reproduce flag that fixes everything to be reproducible (for debugging purposes) instead of operation specific ones like -matstash_reproduce.

> On Jul 29, 2021, at 11:45 AM, Jed Brown <jed at jedbrown.org> wrote:
> Provided it's the same SF, yes. (We use MPI_Waitall instead of MPI_Waitsome or this, though we may be able to shave some time using MPI_Waitsome.)
> Matrix assembly from the stash is a common place; try -matstash_reproduce.
> Mark Adams <mfadams at lbl.gov> writes:
>> GAMG is not deterministic and I'm trying to figure out why.
>> Thanks,
>> Mark

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