[petsc-users] Only print converged reason when not converged

[Matthew Knepley]

On Tue, Jul 28, 2020 at 8:09 PM Alexander Lindsay <alexlindsay239 at gmail.com>
wrote:

> The only slight annoyance with doing this through a PostSolve hook as
> opposed to a pluggable ReasonView system is that if a user passed
> `-snes_converged_reason` on the command line, we would get redundant
> printout from SNESSolve and our PostSolve. Although I suppose we could
> solve this by intercepting their option, not passing it to PETSc, and then
> just using that info to control the output from our PostSolve (e.g. if a
> user passes -snes_converged_reason from the command line, then we should
> always print the reason, instead of just printing when we don't converge).
> So maybe the PostSolve will work fine.
>

Can't you just define another ASCII format that prints what you want for
ReasonView?

   Matt


> On Tue, Jul 28, 2020 at 12:20 PM Barry Smith <bsmith at petsc.dev> wrote:
>
>>
>>   KPSSetPostSolve(),  There is no SNESSetPostSolve()  but there
>> could/should be.
>>
>>    Barry
>>
>>   Note inside the SNESSolve there are a bunch of pre and post hooks,
>> don't get the confused with an outside SNESSetPostSolve()
>>
>> On Jul 28, 2020, at 1:12 PM, Fande Kong <fdkong.jd at gmail.com> wrote:
>>
>> One alternative is to support a plugable KSP/SNESReasonView system. We
>> then could hook up KSP/SNESReasonView_MOOSE.
>>
>> We could call our views from SNES/KSP"done"Solve as well if such a
>> system is not affordable.  What are the final functions we should call,
>> where we guarantee SNES/KSP is already done?
>>
>> Thanks,
>>
>> Fande,
>>
>> On Tue, Jul 28, 2020 at 12:02 PM Barry Smith <bsmith at petsc.dev> wrote:
>>
>>>
>>>   Alex,
>>>
>>>     The actual printing is done with SNESReasonView() and
>>> KSPReasonView() I would suggest copying those files to Moose with a name
>>> change and removing all the code you don't want. Then you can call your
>>> versions immediately after SNESSolve() and KSPSolve().
>>>
>>>    Barry
>>>
>>>
>>> > On Jul 28, 2020, at 10:43 AM, Alexander Lindsay <
>>> alexlindsay239 at gmail.com> wrote:
>>> >
>>> > To help debug the many emails we get about solves that fail to
>>> converge, in MOOSE we recently appended `-snes_converged_reason
>>> -ksp_converged_reason` for every call to `SNESSolve`. Of course, now we
>>> have users complaining about the new text printed to their screens that
>>> they didn't have before. Some of them have made a reasonable request to
>>> only print the convergence reason when the solve has actually failed to
>>> converge. Is there some way we can only print the reason if we've diverged,
>>> e.g. if reason < 0 ?
>>> >
>>> > 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

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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