[petsc-users] Symmetric matrix filling

[Alexander Grayver]

On 30.11.2011 16:22, Matthew Knepley wrote:
> On Wed, Nov 30, 2011 at 9:10 AM, Alexander Grayver 
> <agrayver at gfz-potsdam.de <mailto: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.

And for d_nz/o_nz also 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 <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
>>
>
>
>
>
> -- 
> 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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