[petsc-users] Scaling/Preconditioners for Poisson equation

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:
>> Matrix free you mean AMG (like -pc_mg_galerkin)? Does it reach the same
>> scalability as GMG?
>
>
> No, Jed means calculating the action of the operator matrix-free instead of
> using
> an assembled sparse matrix.

Yeah, that was a diversion; don't worry about it for now.  HPGMG is an
example of an optimized parallel matrix-free geometric multigrid solver.
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