Thomas,
It looks like you are asking FEAP to solve the equations multiples
times. Perhaps you have a nonlinear problem with a Newton loop?
This is not a fair comparison. Edit your run script to only perform 1
(one) solve "tang,,1" (No Newton loops), then compare.
-sg
On 1/27/14 9:48 AM, Thomas Gross wrote:
I ran it with:
-ksp_type cg -pc_type gamg -pc_gamg_type agg -log_summary -ksp_monitor -ksp_view
-options_left -mg_levels_ksp_max_it 1 > GAMG_log_max_it.txt
and
-ksp_type cg -pc_type gamg -pc_gamg_type agg -log_summary -ksp_monitor -ksp_view
-options_left -mg_levels_ksp_type richardson -mg_levels_pc_type sor >
GAMG_log_Rich.txt
(Log files attached)
However, the solution time did not decrease and I still needed to call KSPSolve
3 times although I had -mg_levels_ksp_max_it 1.
Best
Thomas
On Jan 27, 2014, at 5:53 PM, Jed Brown <[email protected]> wrote:
Thomas Gross <[email protected]> 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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