[petsc-users] How rto use multigrid?

[TAY wee-beng]

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
>
>

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