On Wed, Jan 25, 2012 at 1:08 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
> PCASM with multiple subdomains per process. > > PCGAMG coarse levels. > GAMG makes sense, but ASM has to be activated with an option. I don't think it makes sense to do this by default. Matt > 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 >> > -- 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120125/2ead3c4b/attachment.htm>
