[petsc-users] question about partitioning usage

[Jed Brown]

PCASM with multiple subdomains per process.

PCGAMG coarse levels.
On Jan 25, 2012 12:37 PM, "Matthew Knepley" <knepley at gmail.com> wrote:

> 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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