[petsc-users] multigrid_repartitioning

[Jed Brown]

On Fri, Jan 27, 2012 at 11:16, Anton Popov <popov at uni-mainz.de> wrote:

> Does PETSc support repartitioning of coarse grid operators onto a smaller
> subset of processors during coarsening? Or the coarsest grid must be
> represented on the same amount of processors as the finest? It becomes a
> problem when a lot of processors are employed (say 4096 or more). If it is
> supported, how can I use it?


PCGAMG does this automatically. There are some technical challenges to
doing this with geometric multigrid, but we are thinking about how to do it
best.
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