On Nov 7, 2012, at 8:58 AM, A.L. Siahaan <als88 at cam.ac.uk> wrote:
> Hi, I am experimenting with GAMG by changing some of its parameters. I tried > to set the GAMG type into "agg" using : PCGAMGSetType(pc,"agg"); > > and I get the following error : > ========================================================================== > Solving linear system of size 108972 x 108972 (PETSc Krylov solver). > demo_elasticity: > /usr/local/packages/src/petsc-3.3/src/ksp/pc/impls/gamg/agg.c:1522: > PCCreateGAMG_AGG: Assertion `!pc_gamg->subctx' failed. > ========================================================================== > I've pushed a fix into petsc-dev. > Is there any other parameter which needs to be set to enable "agg" ? This is usually set from the command line but you are doing it correctly as far as I can tell. > And what is the default type if I don't set to either "agg" or "geo" ? 'agg' is the default. Thanks, Mark > > Thanks, > Antony >
