[petsc-users] ILU in parallel

[Matthew Knepley]

On Fri, Dec 9, 2011 at 10:06 AM, Alexander Grayver
<agrayver at gfz-potsdam.de>wrote:

> **
> On 09.12.2011 16:58, Matthew Knepley wrote:
>
> On Fri, Dec 9, 2011 at 9:44 AM, Alexander Grayver <agrayver at gfz-potsdam.de
> > wrote:
>
>> Hello,
>>
>> Sorry for dummy question, but what are options for parallel ILU in petsc?
>> Which packages are best for big sparse matrices (>= 10^6)?
>> Where do I start from?
>>
>
>  http://www.mcs.anl.gov/petsc/petsc-dev/docs/linearsolvertable.html
>
>  I generally recommend against parallel ILU, but Hypre has it.
>
> Why?
>

Its fundamentally not scalable, has unpredictable performance, and in my
experience worse than sparse direct.

   Matt


>     Matt
>
>  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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