[petsc-users] PaStix is slower in pestc-dev

[Matthew Knepley]

On Sun, Dec 11, 2011 at 12:05 AM, Xiangdong Liang <xdliang at gmail.com> wrote:

> Hello PETSc team,
>
> I was using PaStiX within petsc 3.1-p8. Today, I am trying PaStiX
> within petsc-dev. However, For the same code, solving the same linear
> system takes longer time (120s vs 90s) in petsc-dev. Both are compiled
> with debugging mode off. Is it possible that the newer PaStiX is
> slower than old version? or due to some options in compiling?
>

It is likely the options are not exactly the same, meaning the ordering is
different,
etc. Did you check everything wiht -ksp_view and -ksp_monitor?

   Matt


> Best,
> Xiangdong
>
> PS. I cannot use PaStiX in 3.2 because in the runtime, PaStiX crashed
> due to missing of the option -DWITHSCOTCH during compiling. It was
> reported before by one user and fixed in petsc-dev, but not in
> petsc-3.2-p5.
>
> http://lists.mcs.anl.gov/pipermail/petsc-users/2011-March/008356.html
>



-- 
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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