[petsc-users] Propagating a constant marker with AMG

[John Mousel]

Thanks Jed,

That'll most likely do what I'm looking for.

John

On Tue, Mar 31, 2015 at 3:47 PM, Jed Brown <jed at jedbrown.org> wrote:

> John Mousel <john.mousel at gmail.com> writes:
>
> > If I recall correctly, GAMG has a somewhat high setup cost and this is a
> > solver I'll only be using for one single solve. It's not a physical
> field,
> > it's just a marker; 1 inside, 0 outside a surface described by a CAD
> file.
> > This marker is being propagated into the volume of an octree volumetric
> > grid. I'm just taking advantage of the fact that the solution of the
> > Laplace equation with constant BC's is the constant.
>
> Oh, I see.  Enforce your boundary conditions so that the problems on
> each side decouple, then use -pc_gamg_agg_nsmooths 0 (unsmoothed
> aggregation).  Profile and let us know if it's a bottleneck.
>
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