[petsc-dev] PETSc MG Solvers vs agmg

[Matthew Knepley]

On Tue, May 1, 2012 at 9:34 AM, Dave Nystrom <dnystrom1 at comcast.net> wrote:

> I have a 2d resistive mhd code that has an interface to both agmg and
> various
> multigrid solvers available from PETSc including gamg, hypre and ml.  I'm
> not
> that familiar with multigrid and so it is difficult for me to know how to
> experiment with the various mg packages and tune them to my particular
> problems.  In my code, agmg is a stand alone solver.  I have a couple of
> questions.
>
> 1.  Is it possible to use the PETSc mg solvers effectively without an
> iterative method by choosing preonly as the iterative method - like I do
> for
> the PETSc direct solves?
>

Yes.

    Matt


> 2.  Is anyone on this list sufficiently familiar with agmg and the other
> PETSc mg solvers to know how to configure the PETSc mg solvers to work more
> like agmg?  It seems that agmg gives better performance than the PETSc mg
> solvers but I also have issues with agmg including fragility.
>
> Thanks,
>
> Dave
>



-- 
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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