Matthew Knepley <[email protected]> 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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