[petsc-users] Question about reordering in ilu...

[Matthew Knepley]

On Fri, Apr 27, 2012 at 5:46 PM, Kyungjoo Kim <iamkyungjoo at gmail.com> wrote:

> Hello,
>
>
> I am wondering if you do something like reordering (nested dissection or
> minimum degree) when you perform ilu.
>

http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/PC/PCFactorSetMatOrderingType.html#PCFactorSetMatOrderingType

   Matt


> I do experiments with one reordered by nested dissection and the other one
> is reordered opposite way.
> (BTW, ilu does not do pivoting but isn't it possible to do pivot if petsc
> find out block matrices such like supernodes ? )
>
> Somehow both behave in the same way. Do you internally reorder a matrix ?
> ( I could not find out any clue about this in reference manual)
>
> Thank you.
>
>
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>
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>


-- 
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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