Hello,Jed
Sorry again for the interruption.
As you said, if I want to use Algebraic multigrid, I can just use '-pc_type
gamg
-pc_gamg_agg_nsmooths 1' in the command line. I think there are many other
-pc_gamg_XXX
parameters. How can I find all the -pc_gamg_XXX?
Besides, I want to know more about AMG. Are there any details from PETSc,
like manual,
documentaion, FAQ, etc?
Also, from the above post, I want to know that if AMG can not be used in
3.2 by command
line option, because now I have to use 3.3 for using AMG. I just donot want to
change my
version 3.2 now.
I am major in Civil Engineering and not good at math and programming. So
please
forgive my weakness.
Thanks.
Jim
>At 2012-10-28 21:17:00,"Jed Brown" <jedbrown at mcs.anl.gov> 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?
>>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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