[petsc-users] Need a diagnose for the slow performance

[Matthew Knepley]

On Mon, Oct 22, 2012 at 12:14 PM, Zhenglun (Alan) Wei <
zhenglun.wei at gmail.com> wrote:

> Dear all,
>     I hope you're having a nice day.
>     I need some help to figure out what is wrong in my code. I had very
> good performance after I change the preconditioner. The out_1, which is
> attached, shows that. Last week, in order to use PETSc in out new cluster,
> I reconfigure the PETSc with the same configuration in the new cluster and
> saved to another directory. My code can obtain very good performance in the
> new machine. However, my code performs very bad in the old cluster, as
> shown in out_2 in the attachment.
>      Does any one have any idea on this?
>

The solver is obviously different since it takes vastly different numbers
of iterates.

   Matt


> thanks,
> Alan
>



-- 
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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