Hello everybody, I’d like to compare a solver with PETSc-gamg for Poisson problems. I used PETSc version 3.4.3., and the following command line option.
-ksp_type “bcgs” -pc_type “gamg” -ksp_monitor -ksp_rtol 1.0E-7 -log_summary -pc_mg_log Would you give me some information on the following questions? - Does this option correspond to BICGSTAB solver with smoothed aggregation algebraic multigrid method? - Are coarser level small distributed matrices re-distributed to reduce the parallelism, when the number of processes is very large? - What kind of smoother will be used for this command line option? - pc_mg_log option shows the MG Apply stage. Does this stage time correspond to the solver time except for multi-level setup time? Does it include the time for BICGSTAB? Thanks in advance. Akihiro Fujii
