[petsc-users] GAMG processor reduction

Jed Brown jedbrown at mcs.anl.gov
Thu Nov 21 15:19:08 CST 2013

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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