[petsc-users] Call to PETSc functions way higher when using lower number of processors

Jose A. Abell M. jaabell at ucdavis.edu
Wed Jul 1 19:57:31 CDT 2015

On Wed, Jul 1, 2015 at 4:34 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>   I suggest you run the following experiment; run with ONE process but use
> -pc_type bjacobi -sub_pc_type ilu -pc_bjacobi_blocks <blocks> where you use
> for <blocks> 1 up to 24 and then get the number of iterations needed for
> each (don't worry about the time it takes, this is done for understanding
> of the convergence). Send the table of

​Hi Barry,

Thanks for the feedback! I switched to SuperLU_dist (-ksp_type preonly
-pc_type lu -pc_factor_mat_solver_package superlu_dist) and saw immediate
speedup for all number of processors. I'll try your experiment and see what
comes up.



José Abell
PhD Candidate
Computational Geomechanics Group
Dept. of Civil and Environmental Engineering
UC Davis
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