[petsc-dev] ISRestoreNonlocalIS?

Jed Brown jed at 59A2.org
Thu Nov 18 17:13:47 CST 2010

On Thu, Nov 18, 2010 at 23:35, Barry Smith <bsmith at mcs.anl.gov> wrote:

> MatGetRedundantMatrix() which is used by PCREDUNDANT which is very useful
> doing multigrid when you want to solve the coarse problems on subsets of
> processes :-)

That matrix lives on subcomms (which is completely sane), not on the global
comm.  The thing I was calling strange would be to concatenate all the
redundant matrices and make the concatenated thing live on the global comm.

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