On 28/10/2012 2:17 PM, Jed Brown wrote: > > Algebraic multigrid can be used directly, -pc_type gamg > -pc_gamg_agg_nsmooths 1. Geometric either required that you use the > PCMG interface to set interpolation (and provide a coarse operator for > non-Galerkin) or use a DM that provides coarsening capability. > > What kind of problem are you solving? >
Hi, May I know if there is an example which explains using the geometric MG, either using PCMG or DM? Yours sincerely, TAY wee-beng > On Oct 28, 2012 6:09 AM, "w_ang_temp" <w_ang_temp at 163.com > <mailto:w_ang_temp at 163.com>> wrote: > > Hello, > I want to use the multigrid as a preconditioner. The > introduction about it in the manual is little. > So are there some typical examples or details about multigrid? Is > it used just like other preconditioners > like jacobi, sor, which can be simply used in the cammand line > options? > Thanks. > Jim > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20121030/d6471c30/attachment.html>
