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 <[email protected]> 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
