[petsc-dev] GAMG MatSetValues error

John Mousel john.mousel at gmail.com
Mon Sep 24 20:48:21 CDT 2012

I'm having a problem with GAMG causing a MatSetValues() is [some non-zero
number] after

[0] PCSetUp(): Setting up new PC

 I don't get this with either ILU or HYPRE/BoomerAMG. I've attached the
output of -info. I see there is a recent change to some pre-allocation for
GAMG here:


I'm not sure if that has anything to do with it, but my blocksize is 1. I'm
running with the following options.

-ksp_type bcgsl -pc_type gamg -pc_gamg_threshold 0.01 -mg_levels_ksp_type
richardson -mg_levels_pc_type sor -mg_coarse_ksp_type richardson
-mg_coarse_pc_type sor -mg_coarse_pc_sor_its 4 -pc_gamg_type agg
-pc_gamg_agg_nsmooths 1 -pc_gamg_sym_graph true -info

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