[petsc-users] SNES solver

[Jed Brown]

On Fri, May 13, 2011 at 06:51, Tian(ICT) <rongtian at ncic.ac.cn> wrote:

> What does this output really mean?
> Why does a converged Newton iteration still lead to a diverged SNES solve?
>
>
Newton did not converge.


>
> STEP 0 (Newton iterations: 3)
>
> diverged reason: -6
>

You should consider using

PetscPrintf(comm,"%s\n",SNESConvergedReasons[reason]);

instead of printing the numeric value. Or just run with
-snes_converged_reason to have PETSc print it for you before SNESSolve
returns. The reason is SNES_DIVERGED_LINE_SEARCH
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