[petsc-users] How rto use multigrid?

[Jed Brown]

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?
On Oct 28, 2012 6:09 AM, "w_ang_temp" <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
>
>
>
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