[petsc-users] Block-ILU in Petsc

behzad baghapour behzad.baghapour at gmail.com
Fri Oct 14 09:09:45 CDT 2011

So, Am I right with 2 things below?

1- If I set BAIJ for Mat, then the ILU preconditoner automatically recognize
to use Block-version of ILU preconditioners? (like VBILUM developed by Saad
and coworkers) or I should do more for Block preconditioning?

2- "the block size is the same the matrix block size" means that there is no
way to combine the matrix elements to build blocks of possible maximum size
like Hash method or something like this?

Thanks a lot.

On Fri, Oct 14, 2011 at 1:50 PM, Matthew Knepley <knepley at gmail.com> wrote:

> On Fri, Oct 14, 2011 at 3:05 AM, behzad baghapour <
> behzad.baghapour at gmail.com> wrote:
>> Dear all,
>> How should I efficiently use block-ILU preconditioner in Petsc?
>> I saw in man-page of PCILU:
>> "For BAIJ matrices this implements a point block ILU". What exactly it
>> means?
> That the block size is the same the matrix block size.
>   Matt
>> Regards,
>> Behzad
> --
> 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

Behzad Baghapour
Ph.D. Candidate, Mechecanical Engineering
University of Tehran, Tehran, Iran
Fax: 0098-21-88020741
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