[petsc-users] Symmetric matrix filling

[Matthew Knepley]

On Wed, Nov 30, 2011 at 9:10 AM, Alexander Grayver
<agrayver at gfz-potsdam.de>wrote:

> **
> I'm not sure that MAT(S)BAIJ is what I need. My matrix symmetric, but not
> block.
> Well, I solve vector equations and there are 2-3 blocks (depending on the
> problem dimension), but this blocks normaly have size of > 10^5. So which
> block size should I specify to be efficient?
>

Just use 1.

  Matt


> Regards,
> Alexander
>
> On 30.11.2011 14:27, Alexander Grayver wrote:
>
> Thanks Matt!
>
> Regards,
> Alexander
>
> On 30.11.2011 14:16, Matthew Knepley wrote:
>
> On Wed, Nov 30, 2011 at 3:43 AM, Alexander Grayver <
> agrayver at gfz-potsdam.de> wrote:
>
>> Hello,
>>
>> I'm trying to use mumps through PETSc now with symmetric matrix and
>> cholesky factorization.
>> When I use it directly I fill up only upper part of the matrix and set
>> mumid%SYM = 2. Is that possible to follow same way with petsc?
>> Which options do I have to choose?
>>
>
>  http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Mat/MATSBAIJ.html
>
>    Matt
>
>
>> Thanks in advance.
>>
>> Regards,
>>  Alexander
>>
>
>
>
>  --
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> -- Norbert Wiener
>
>
>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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