[petsc-users] DIVERGED_FNORM_NAN
Alexander Lindsay
adlinds3 at ncsu.edu
Thu Sep 17 09:24:51 CDT 2015
It solved beautifully with MUMPS. Thank you Matt!
Alex
On 09/16/2015 10:58 AM, Matthew Knepley wrote:
> On Wed, Sep 16, 2015 at 8:28 AM, Alexander Lindsay <adlinds3 at ncsu.edu
> <mailto:adlinds3 at ncsu.edu>> wrote:
>
> Hi all,
>
> 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?
>
> 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.
>
>
> The NaN means something has gone wrong. However, there are a few
> SuperLU_dist bugs that we know of. You could try:
>
> - Upgrading PETSc to the latest patch, which should download the
> fixed SuperLU_dist
>
> - Trying MUMPS instead
>
> Thanks,
>
> Matt
>
> Alex
>
>
>
>
> --
> 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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