[petsc-users] Example for GAMG

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:

> and just adjust the da_refine to see the constant number of iterates. Same
> thing in 3D
>
>   ./ex48 -M 5 -N 5 -da_refine 5 -ksp_rtol 1.0e-9 -thi_mat_type baij
> -pc_type mg -pc_mg_levels 4 -snes_monitor -snes_view -log_summary

This needs -thi_mat_type aij to be used with GAMG.

Also, this problem is difficult to globalize without grid sequencing
(use -snes_grid_sequence instead of -da_refine).  And it's not a great
test for GAMG because it (currently) does not set the near-null space so
rotations are not used by smoothed aggregation.
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