[petsc-users] Mumps

Matthew Knepley knepley at gmail.com
Fri Feb 18 09:58:21 CST 2011

On Fri, Feb 18, 2011 at 9:36 AM, Joshua Booth <jdbst21 at gmail.com> wrote:

> Hello,
> I have been have problems using Mumps on a large (O(1M) sparse martrix) on
> multiple cores.  I first used the Petsc interface but it would hang
> sometime.
> Therefore, I wrote it now using MUMPS's C interface.
> The code works for one or two cores, but again hangs in the factorization
> stage using 4 cores.

Have you verified that this is actually hanging (in PETSc and MUMPS) and not
just slow? These factorizations
can have a large amount of fill and thus can get very slow and use a lot of
memory for matrices this large.


> Note:  That mumps, BLASC, and Scalpack was installed with petsc using
> --download
> Compiled using intel 11.1
> If anyone has any ideal, I would really appreciate some feedback.
> Thank you
> Josh

What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
-- Norbert Wiener
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