[petsc-dev] DMMG without libpetscsnes?
jed at 59A2.org
Thu Jan 7 15:06:07 CST 2010
On Thu, 7 Jan 2010 14:52:41 -0600, Barry Smith <bsmith at mcs.anl.gov> wrote:
> There would be no SNES in this context! One would be able to
> cleanly and simply (more so then today) put geometric multigrid inside
> a Schure fieldsplit preconditioner. If one can't then we screwed up
> our new design.
I think we're agreeing. My comment was just a retort to the claim that
linear problems are silly. They are silly if that's your end goal, and
I believe they are still silly when using a scheme where the quality of
your solution depends on the quality of the linear solve (as in a
semi-implicit scheme), but having a nice interface for linear MG is
important when it goes inside a preconditioner. In contrast, I think
that all special treatment of linear problems could be stripped out of
TS with no ill consequences.
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