[petsc-users] question about partitioning usage

[Matthew Knepley]

On Wed, Jan 25, 2012 at 12:29 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.
>
> Can you please expand? I am partitioning my input unstructured mesh to
> distribute dofs throughout the processes, and then I am setting up my
> MPI matricess "as usual", not intending any calls to parmetis or other
> partitioning functions... So where can I tell or not tell Petsc to use
> partitioning here or not?
>

Unless you create a MatPartitioning object, we do not call ParMetis.

   Matt


> Many thanks
> 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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