[petsc-users] Symmetric matrix filling

[Alexander Grayver]

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?

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 <mailto: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
>

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