ksp tutorial ex22

[Ryan Yan]

Hi Barry,
Thank you very much for the confirm.

Yan

On Thu, Dec 10, 2009 at 3:12 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
> On Dec 10, 2009, at 2:09 PM, Ryan Yan wrote:
>
>  Hi all,
>> I was looking at the ex22 of ksp.
>>
>> If I call:
>> ...
>> ierr = DMMGCreate(PETSC_COMM_WORLD,3,PETSC_NULL,&dmmg);CHKERRQ(ierr);
>> ierr =
>> DACreate3d(PETSC_COMM_WORLD,DA_NONPERIODIC,DA_STENCIL_STAR,-3,-3,-3,PETSC_DECIDE,PETSC_DECIDE,PETSC_DECIDE,1,1,0,0,0,&da);CHKERRQ(ierr);
>>  ...
>>
>> How many grid pts should I have on the finest level? Is it 27, considering
>> I am set 3 as the global dimension in each direction of the array?
>>
>> When I run ex22 with -ksp_view, I saw that  on the finest level there are
>> 9 pts on each direction.
>>
>> Is that because I have 3 level?
>>
>
>   Yes. The DA you create initially is for the coarsest grid, finer ones are
> automatically created by the DMMG.
>
>   Barry
>
>
>> Yan
>>
>>
>
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