On Fri, 7 Nov 2008, Derek Gaston wrote: > The answer to #2 is YES... We use Hypre with BoomerAMG to precondition > our matrix free solves all the time. Just build petsc with Hypre > support and pass the following on the command-line for your app: > > -snes_mf_operator -pc_type hypre -pc_hypre_type boomeramg > > This will use AMG on whatever you put into the jacobian matrix and use > the result to precondition your matrix free solve.
Wait - run that by me again? "matrix free solves" ... "use AMG on whatever you put into the jacobian matrix" ... Wouldn't that make it an "AMG free solve"? But seriously, how is AMG possible without a matrix to work with? Also: do you have BoomerAMG working on asymmetric problems? It was giving us real trouble (like, converging to the wrong result trouble) a couple years back when we tried to use it on a problem with an asymmetric jacobian. --- Roy ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
