[petsc-users] Failure of MUMPS

[Mike Wick]

Hi Hong:

There is no explicit error message actually. The solver converge in 0
iteration and returns an nan number. Looks like a zero pivoting problem.

Mike

On Fri, Oct 5, 2018 at 6:12 PM Zhang, Hong <hzhang at mcs.anl.gov> wrote:

> Mike:
>
>> Hello PETSc team:
>>
>> I am trying to solve a PDE problem with high-order finite elements. The
>> matrix is getting denser and my experience is that MUMPS just outperforms
>> iterative solvers.
>>
>> For certain problems, MUMPS just fail in the middle for no clear reason.
>> I just wander if there is any suggestion to improve the robustness of
>> MUMPS? Or in general, any suggestion for interative solver with very
>> high-order finite elements?
>>
>
> What error message do you get when MUMPS fails? Out of memory, zero
> pivoting, or something?
>  Hong
>
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