[petsc-users] Near nullspace for preconditioners other than GAMG?

[David Knezevic]

OK, got it, thanks!

David


On Thu, Mar 5, 2015 at 5:08 PM, Jed Brown <jed at jedbrown.org> wrote:

> David Knezevic <david.knezevic at akselos.com> writes:
> > I was just wondering if its possible to achieve the same sort of thing
> with
> > other AMG solvers (e.g. BoomerAMG)? I assume that MatSetNearNullSpace
> does
> > nothing for external solvers like hypre, right?
>
> It is used by ML (smoothed aggregation), but not BoomerAMG (classical
> AMG) which uses an algorithm that doesn't have a natural place for such
> information.  To my knowledge, classical AMG is not widely used for
> elasticity.  It is very robust for M-matrices.
>
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