Btw, is the file to download ftp://ftp.mcs.anl.gov/pub/petsc/externalpackages/ml-5.0.tar.gz?
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 >> >> >> > > >