[petsc-users] GAMG processor reduction

[John Mousel]

Thanks Jed. How does this represent itself in the KSPView output?


On Thu, Nov 21, 2013 at 3:19 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> John Mousel <john.mousel at gmail.com> writes:
>
> > I'm solving a Poisson equation with BiCGStab/GAMG. I'm looking at KSPView
> > and I see that the problem is not reducing the number of processors on
> the
> > coarser grids. My coarse problem is 723x723, and it looks like it's still
> > being solved on 192 processes. This doesn't seem right, and I'm believe
> > this used to trigger processor reduction.
>
> It still uses the big communicator, but all but rank 0 should be empty
> on the coarsest grid.
>
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