[petsc-users] Recommended solver and preconditioner to solve Poisson eqn on win7

[Jed Brown]

On Fri, Sep 14, 2012 at 6:17 PM, Matthew Knepley <knepley at gmail.com> wrote:

> Unless I am reading this wrong, you have a bizarre coarse grid solver. It
> should be redundant LU but instead
> you have GMRES/BJacobi?
>

That is Mark's default. The proper coarse grid solve ends up being pretty
expensive. Mark set the GAMG default to just do bjacobi because it was
scaling better in practice. I don't know where this GMRES is coming from
because it doesn't show up in my tests with 3.3.
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