On Thu, 16 Aug 2007, Ben Tay wrote:
> Btw, is the file to download > ftp://ftp.mcs.anl.gov/pub/petsc/externalpackages/ml-5.0.tar.gz? Yes. You can simply use '--download-ml=1' during configuration. Run your program with '-help' to see all options for using ml. See ~petsc/src/ksp/ksp/examples/tests/ex26.c on how to use ML. Hong > > Thanks > > Matthew Knepley wrote: > > The multigrid PC needs information about the grid and discretization. If you > > cannot provide this, use AMG through Hypre or ML. Or if you have a > > structured grid, consider using DMMG. > > > > Thanks, > > > > Matt > > > > On 8/15/07, Ben Tay <zonexo at gmail.com> wrote: > > > >> Hi, > >> > >> I found that there's a multigrid option in the manual which can be used > >> by adding -pctype mg -pcmgtype PC_MG_MULTIPLICATIVE. > >> > >> However, it seems that I am actually just using LU since with or without > >> this option, I got exactly the same answer. Am I using multigrid the > >> wrong way? > >> > >> Thanks > >> > >> > >> > > > > > > > >
