[petsc-users] Scaling/Preconditioners for Poisson equation

[Filippo Leonardi]

Thank you everybody, number of iterations seems now to be under control, I'll 
run some scaling test and hope for the best.

On Monday 29 September 2014 16:02:24 Jed Brown wrote:
> 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.

Now I am intrigued, is there, by any chance, any reference I can look up for 
this?
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