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

[Jed Brown]

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*      #                          WARNING!!!                    #*
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*      #   This code was compiled with a debugging option,      #*
*      #   To get timing results run ./configure                #*
*      #   using --with-debugging=no, the performance will      #*
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On Fri, Sep 14, 2012 at 6:08 PM, Zhenglun (Alan) Wei <zhenglun.wei at gmail.com
> wrote:

>  I'm sorry about that. I attached the output files here with '
> -ksp_monitor -ksp_view -log_summary'. They are named after the grid size
> and pc-type.
>
> cheers,
> Alan
>
> On 9/14/2012 5:51 PM, Jed Brown wrote:
>
> On Fri, Sep 14, 2012 at 5:49 PM, Matthew Knepley <knepley at gmail.com>wrote:
>
>> On Fri, Sep 14, 2012 at 5:40 PM, Zhenglun (Alan) Wei <
>> zhenglun.wei at gmail.com> wrote:
>>
>>>  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.
>>>
>>
>>  When asking questions about convergence, always always ALWAYS send the
>> output of -ksp_monitor -ksp_view. If
>> you don't, we are just guessing blindly.
>>
>
>  And -log_summary because this is about performance.
>
>
>
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