[petsc-users] Agglomeration for Multigrid on Unstructured Meshes

[Matthew Knepley]

On Mon, Jun 1, 2020 at 7:03 PM Danyang Su <danyang.su at gmail.com> wrote:

> Thanks Jed for the quick response. Yes I am asking about the
> repartitioning of coarse grids in geometric multigrid for unstructured
> mesh. I am happy with AMG. Thanks for letting me know.
>

All the pieces are there, we just have not had users asking for this, and
it will take some work to put together.

  Thanks,

    Matt


> Danyang
>
> On 2020-06-01, 1:47 PM, "Jed Brown" <jed at jedbrown.org> wrote:
>
>     I assume you're talking about repartitioning of coarse grids in
>     geometric multigrid -- that hasn't been implemented.
>
>
> https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCTELESCOPE.html
>
>     But you can use an algebraic multigrid that does similar communicator
>     reduction, and can be applied to the original global problem or just on
>     the "coarse" problem of an initial geometric hierarchy.
>
>     Danyang Su <danyang.su at gmail.com> writes:
>
>     > Dear All,
>     >
>     >
>     >
>     > I recalled there was a presentation ‘Extreme-scale multigrid
> components with PETSc’  taling about agglomeration in parallel multigrid,
> with future plan to extend to support unstructured meshes. Is this under
> development or to be added?
>     >
>     >
>     >
>     > Thanks and regards,
>     >
>     >
>     >
>     > Danyang
>
>
>

-- 
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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