[petsc-dev] boomerAmg scalability

[Jed Brown]

On Thu, Jan 5, 2012 at 21:34, Mark F. Adams <mark.adams at columbia.edu> wrote:

> This is scary having two communicators running around but the processors
> that are dropped out of the new communicator have no rows -- that is why
> they are dropped out.


Okay, now I see the "if (ncrs0 != 0)". I also recall that this is only
running on a sub-communicator because ParMetis happens to crash if you give
it zero vertices on a given proc. I'm inclined to move this communicator
shuffle into MatPartitioningApply_Parmetis() so that user code doesn't have
to mess with it.
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