[petsc-dev] boomerAmg scalability

[Matthew Knepley]

On Thu, Dec 15, 2011 at 10:23 AM, Ravi Kannan <rxk at cfdrc.com> wrote:

> Dear All,****
>
> ** **
>
> This is Ravi Kannan from CFD Research Corporation. Recently, we are
> experimenting with the BoomerAMG preconditioner for some “stiff” CFD
> problems. In that regard, all the other standard solver-preconditioner
> combinations failed for the current CFD problem. The boomer is the only one
> which is able to provide with “converged” solutions.****
>
> ** **
>
> We noticed that the scalability of this boomer preconditioner is really
> poor. For instance, even with a cell size of 2 million, we cannot scale to
> even 16 partitions (in contrast, the other solver-preconditioner
> combinations like the BI-CGS/BJacobi gave good enough scalability).****
>
> ** **
>
> Are we missing something? Do we need to use a more latest version of
> boomer?
>

Have you tried -pc_type gamg in petsc-dev?

  Matt


> Thanks,****
>
> Ravi. ****
>
>
>

-- 
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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