[petsc-users] Prometheus vs GAMG for elasticity/plasticity problems

[Jed Brown]

Thomas Gross <tgross at ilsb.tuwien.ac.at> writes:

> Please find enclosed the log summary for the runs.
>
> I used the following options for Prometheus and GAMG:
> Prometheus:
> -ksp_type cg -pc_type prometheus -log_summary -ksp_monitor -ksp_view -aggmg_smooths 1 -options_left
> GAMG:
> -ksp_type cg -pc_type gamg -pc_gamg_type agg -pc_gamg_agg_nsmooths 1 -log_summary -ksp_monitor -ksp_view -options_left

This is a pretty small problem, but switch back to a single smoothing
iteration -mg_levels_ksp_max_it 1.  An alternative is
-mg_levels_ksp_type richardson -mg_levels_pc_type sor.

Note that you are calling KSPSolve 3 times with GAMG, but only once with
Prometheus.
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