[petsc-dev] FieldSplit fixes in 3.3

Jed Brown jedbrown at mcs.anl.gov
Mon Aug 27 18:41:48 CDT 2012

On Mon, Aug 27, 2012 at 6:08 PM, Dmitry Karpeev <karpeev at mcs.anl.gov> wrote:

> 2. Show me the part of this code that uses jac->head->ksp?
> Incidentally, regarding the use of jac->head->ksp:
> True, there is no use of jac->head->ksp -- the Schur complements "inner"
> solver is being used,
> but that's a conceptual mistake, as far as I can tell.  It doesn't matter
> in petsc-3.3 where the inner
> and outer A00 solvers are identical under all circumstances.  Not so in
> petsc-dev -- we recently went
> through all that trouble of introducing ways of setting up the inner and
> outer solvers separately -- and
> now the outer solver (jac->head->ksp) isn't even being used.  I imagine
> that's just simple oversight,
> but once it's corrected, jac->head->ksp will have to be set up even in the
> Schur case.

As I understand it, Matt is planning to complete this feature at some point.
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