[petsc-users] question about partitioning usage

[Matthew Knepley]

On Wed, Jan 25, 2012 at 12:10 PM, Dominik Szczerba <dominik at itis.ethz.ch>wrote:

> I recently realized that, independently of my explicitly partitioning
> the input mesh, Petsc also employs partitioning somewhere internally.
>

We don't unless you tell us to.


> Is my understanding correct then:
>
> * parmetis is the default even when other partitioners were configured
>

Yes.


> * for MPIAIJ matrices the employed partitioner must be parallel, e.g.,
> parmetis or ptscotch and not sequential, e.g. chaco or party.
>

Yes.

   Matt


> Thanks for any clarifications.
>
> PS. I can not configure petsc with --download-ptscotch on any of my
> systems, will send configure.log's soon.
>
> Dominik

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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