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

[Jed Brown]

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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