On Fri, Feb 18, 2011 at 9:36 AM, Joshua Booth <span dir="ltr"><<a href="mailto:jdbst21@gmail.com">jdbst21@gmail.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hello,<br><br>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.<br>Therefore, I wrote it now using MUMPS's C interface. <br>
The code works for one or two cores, but again hangs in the factorization stage using 4 cores.<br></blockquote><div><br></div><div>Have you verified that this is actually hanging (in PETSc and MUMPS) and not just slow? These factorizations</div>
<div>can have a large amount of fill and thus can get very slow and use a lot of memory for matrices this large.</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Note: That mumps, BLASC, and Scalpack was installed with petsc using --download<br>Compiled using intel 11.1<br><br>If anyone has any ideal, I would really appreciate some feedback.<br>
<br>Thank you<br><br>Josh<br>
</blockquote></div><br><br clear="all"><br>-- <br>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener<br>