And with 7-point stensils and no large material discontinuities you probably want -pc_gamg_square_graph 10 -pc_gamg_threshold 0.0 and you could test the square graph parameter (eg, 1,2,3,4).
And I would definitely test hypre. On Thu, Jun 14, 2018 at 8:54 AM Mark Adams <[email protected]> wrote: > >> Just -pc_type hypre instead of -pc_type gamg. >> >> > And you need to have configured PETSc with hypre. > >
