On Mar 14, 2012, at 11:56 AM, John Mousel wrote: > Mark, > > The matrix is asymmetric. Does this require the setting of an option?
Yes: -pc_gamg_sym_graph Mark > I pulled petsc-dev this morning, so I should have (at least close to) the > latest code. > > John > > On Wed, Mar 14, 2012 at 10:54 AM, Mark F. Adams <mark.adams at columbia.edu> > wrote: > > On Mar 14, 2012, at 11:08 AM, John Mousel wrote: > >> I'm getting the following error when using GAMG. >> >> petsc-dev/src/ksp/pc/impls/gamg/agg.c:508: smoothAggs: Assertion `sgid==-1' >> failed. > > Is it possible that your matrix is structurally asymmetric? > > This code is evolving fast and so you will need to move to the dev version if > you are not already using it. (I think I fixed a bug that hit this assert). > >> >> When I try to alter the type of aggregation at the command line using >> -pc_gamg_type pa, I'm getting >> >> [0]PETSC ERROR: [1]PETSC ERROR: --------------------- Error Message >> ------------------------------------ >> [1]PETSC ERROR: Unknown type. Check for miss-spelling or missing external >> package needed for type: >> see http://www.mcs.anl.gov/petsc/documentation/installation.html#external! >> [1]PETSC ERROR: Unknown GAMG type pa given! >> >> Has there been a change in the aggregation options? I just pulled petsc-dev >> this morning. >> > > Yes, this option is gone now. You can use -pc_gamg_type agg for now. > > Mark > >> John > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120314/a8563415/attachment.htm>
