[petsc-dev] Subcomms

[Matthew Knepley]

> We can take this to dev, but would you advocate doing this by making new
> comms?


> I want blocks of MatNest to be able to reside on subcomms. If that
happened, inner KSPs for PCFieldSplit could also move to subcomms. PCMG
should be able to run coarse levels on subcomms.

This seems like an excellent source of new and confusing parallel errors.
How do we control organization of
subcomms, compatibility (checking without deadlock), and reporting? Should
we maintain a relation stored
in the communicators (comm graph), or outside?

However, I think this is the right move.

   Matt

-- 
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
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