[petsc-dev] boomerAmg scalability

[Mark F. Adams]

On Jan 5, 2012, at 10:52 PM, Jed Brown wrote:

> 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.

Yes it would be much better to move this communicator junk into the parmetis interface. 

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