Thomas Gross <[email protected]> writes: > Dear petsc users/developers, > > I am using petsc in a parallel FEAP framework > (http://www.ce.berkeley.edu/projects/feap/) for mechanics oriented problems > (mainly linear elasticity or plasticity). > In earlier petsc versions (3.2.7) I always used the petsc options: > -ksp_type cg -pc_type prometheus (with standard settings) and achieved a > great level of performance. > > After updating to petsc 3.4.3, where the “Prometheus” preconditioner was > replaced by “GAMG”, I can not reach the same level of performance. My > settings are: > -ksp_type cg -pc_type gamg -pc_gamg_type agg -pc_gamg_agg_nsmooths 1 > (settings recommended for FEAP). > > Is there a set of GAMG settings, which are equivalent to the standard > Prometheus settings?
Please send -log_summary -ksp_monitor -ksp_view output for both cases. Make sure to use the same smoother you used with Prometheus.
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