[petsc-users] `snes+ksponly` did not update the solution when ksp failed.

[Zongze Yang]

Thank you for your clarification.

Best wishes,
Zongze


On Mon, 20 Mar 2023 at 20:00, Matthew Knepley <knepley at gmail.com> wrote:

> On Mon, Mar 20, 2023 at 2:41 AM Zongze Yang <yangzongze at gmail.com> wrote:
>
>> Hi,
>>
>> Hope this email finds you well. I am using firedrake to solve linear
>> problems, which use SNES with KSPONLY.
>>
>> I found that the solution did not update when the `ksp` failed with DIVERGED_ITS.
>> The macro `SNESCheckKSPSolve` called in `SNESSolve_KSPONLY` make it
>> return before the solution is updated.
>>
>
> Yes, this is the intended behavior. We do not guarantee cleanup on errors.
>
>
>> Is this behavior as expected? Can I just increase the value of `maxLinearSolveFailures`
>> to make the solution updated without introducing other side effects?
>>
>
> Yes, that is right. It will not have other side effects with this SNES
> type.
>
>   Thanks,
>
>      Matt
>
>
>> Best wishes,
>> Zongze
>>
>
>
> --
> 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
>
> https://www.cse.buffalo.edu/~knepley/
> <http://www.cse.buffalo.edu/~knepley/>
>
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