<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Wed, Sep 16, 2015 at 8:28 AM, Alexander Lindsay <span dir="ltr"><<a href="mailto:adlinds3@ncsu.edu" target="_blank">adlinds3@ncsu.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi all,<br>
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I've built a MOOSE application and the problem I'm studying solves great using serial LU. However, when I try to solve in parallel using super LU, I encounter many DIVERGED_LINE_SEARCH errors using the default bt line search. If I switch to line_search=none, then instead of DIVERGED_LINE_SEARCH errors I get DIVERGED_FNORM_NAN errors. I do not have a lot of debugging experience, but I am slowly gaining more. Is there a good way to get more information about what's causing the NAN's? I.e. a specific residual or jacobian statement?<br>
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This may not even be an appropriate list to post this problem in (could be more on the MOOSE side); apologies if that's the case.<br></blockquote><div><br></div><div>The NaN means something has gone wrong. However, there are a few SuperLU_dist bugs that we know of. You could try:</div><div><br></div><div> - Upgrading PETSc to the latest patch, which should download the fixed SuperLU_dist</div><div><br></div><div> - Trying MUMPS instead</div><div><br></div><div> Thanks,</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">
Alex<br>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">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</div>
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