[petsc-users] [EXTERNAL] Re: Alternate mesh partitioners to METIS/ParMETIS

[Matthew Knepley]

On Thu, May 7, 2020 at 11:15 AM Lisandro Dalcin <dalcinl at gmail.com> wrote:

> On Thu, 7 May 2020 at 17:53, Hammond, Glenn E via petsc-users <
> petsc-users at mcs.anl.gov> wrote:
>
>> Jed,
>>
>> We call MatMeshToCellGraph() to generate the dual matrix.  This function
>> relies upon ParMETIS.  Can you point me to a similar function that does not
>> require ParMETIS ( e.g. for PTScotch)?
>>
>>
> Maybe a starting point:
>
> DMPlexCreateFromCellList(comm, ..., &dm);
> PetscSectionCreate(comm, &cellPartSection);
> DMPlexGetPartitioner(dm, &partitioner);
> PetscPartitionerSetType(partitioner, PETSCPARTITIONERPTSCOTCH);
> PetscPartitionerDMPlexPartition(partitioner, dm, NULL, cellPartSection,
> &cellPart);
>
> One minor annoyance is that the first call will need the vertex
> coordinates.  Matthew, any better way?
>

I can just fix it to allow NULL for coordinates.

  Matt


> --
> Lisandro Dalcin
> ============
> Research Scientist
> Extreme Computing Research Center (ECRC)
> King Abdullah University of Science and Technology (KAUST)
> http://ecrc.kaust.edu.sa/
>


-- 
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

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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