[petsc-users] Recommended solver and preconditioner to solve Poisson eqn on win7

[Zhenglun (Alan) Wei]

Dear folks,
     I did some test with -pc_type gamg with 
/src/ksp/ksp/example/tutorial/ex45.c. It is not as good as default 
-pc_type when my mesh (Cartisian) is 100*50*50; while it is a little bit 
better than the default one when the mesh is 200*100*100. Therefore, I 
guess this type of pc is good for larger problem. Is that ture? or is 
there any rule of thumb for this type of preconditioner? BTW, I tested 
it with 8 processes.

thanks,
Alan
On 9/14/2012 9:38 AM, Mark F. Adams wrote:
>
> On Sep 14, 2012, at 8:47 AM, Jed Brown <jedbrown at mcs.anl.gov 
> <mailto:jedbrown at mcs.anl.gov>> wrote:
>
>> On Fri, Sep 14, 2012 at 3:47 AM, TAY wee-beng <zonexo at gmail.com 
>> <mailto:zonexo at gmail.com>> wrote:
>>
>>     Hi,
>>
>>     I need to solve the Poisson eqn on my win7 machine. I'm currently
>>     using BCGS without preconditioner. I can't use HYPRE since I'm
>>     using Fortran and win7. It's rather slow.
>>
>>     Is there a recommended solver and preconditioner to solve the
>>     Poisson eqn to get me started?
>>
>>
>> What discretization?
>>
>> Run with -pc_type gamg to start.
>
> and
>
> -pc_gamg_agg_nsmooths 1
>
> (I should make this the default)
>
> Mark
>

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