[petsc-users] Agglomeration for Multigrid on Unstructured Meshes

[Jed Brown]

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,
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> 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? 
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> Thanks and regards,
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> Danyang