[petsc-users] SNESSetOptionsPrefix usage

[Matthew Knepley]

On Thu, Jan 16, 2020 at 4:18 AM Timothée Nicolas <timothee.nicolas at gmail.com>
wrote:

> Actually, for the main solver it works. I'm thinking, could it be due to
> the fact that the second SNES instance is defined in a routine that is
> called somewhere inside the FormFunction of the main SNES? We are improving
> our boundary condition, which becomes quite complex, and we have a small
> problem to solve, so I'm trying to handle it with a SNES. So the two SNES
> are nested, in a sense.
>

As long as SNESSetFromOptions() is being called, it should function
properly. That is why we want to see it in the debugger.

  Thanks,

    Matt


> Timothée
>
> Le mer. 15 janv. 2020 à 23:24, Timothée Nicolas <
> timothee.nicolas at gmail.com> a écrit :
>
>> I can actually use some command line arguments. My line arguments
>> actually read
>>
>> -snes_mf -green_snes_monitor
>>
>> and the first -snes_mf argument (for the main solver snes) is correctly
>> taken into account.
>> I will try what Barry suggested, I'll tell you if I find the reason.
>>
>> Best regards, thanks for your comments
>>
>> Timothée
>>
>> Le mer. 15 janv. 2020 à 18:56, Matthew Knepley <knepley at gmail.com> a
>> écrit :
>>
>>> I think that Mark is suggesting that no command line arguments are
>>> getting in.
>>>
>>> Timothee,
>>>
>>> Can you use any command line arguments?
>>>
>>>   Thanks,
>>>
>>>      Matt
>>>
>>> On Wed, Jan 15, 2020 at 12:04 PM Smith, Barry F. via petsc-users <
>>> petsc-users at mcs.anl.gov> wrote:
>>>
>>>>
>>>>   Should still work. Run in the debugger and put a break point in
>>>> snessetoptionsprefix_ and see what it is trying to do
>>>>
>>>>   Barry
>>>>
>>>>
>>>> > On Jan 15, 2020, at 8:58 AM, Timothée Nicolas <
>>>> timothee.nicolas at gmail.com> wrote:
>>>> >
>>>> > Hi, thanks for your answer,
>>>> >
>>>> > I'm using Petsc version 3.10.4
>>>> >
>>>> > Timothée
>>>> >
>>>> > Le mer. 15 janv. 2020 à 14:59, Mark Adams <mfadams at lbl.gov> a écrit :
>>>> > I'm guessing a Fortran issue. What version of PETSc are you using?
>>>> >
>>>> > On Wed, Jan 15, 2020 at 8:36 AM Timothée Nicolas <
>>>> timothee.nicolas at gmail.com> wrote:
>>>> > Dear PETSc users,
>>>> >
>>>> > I am confused by the usage of SNESSetOptionsPrefix. I understand this
>>>> is required if you have for example different SNES in your program and want
>>>> to set different options for them.
>>>> > So for my second snes I wrote
>>>> >
>>>> > call SNESCreate(MPI_COMM_SELF,snes,ierr)
>>>> > call SNESSetOptionsPrefix(snes,'green_',ierr)
>>>> > call SNESSetFromOptions(snes,ierr)
>>>> >
>>>> > etc.
>>>> >
>>>> > Then when launching the program I wanted to monitor that snes so I
>>>> launched it with the option -green_snes_monitor instead of -snes_monitor.
>>>> But I keep getting the message
>>>> >
>>>> > WARNING! There are options you set that were not used!
>>>> > WARNING! could be spelling mistake, etc!
>>>> > Option left: name:-green_snes_monitor (no value)
>>>> >
>>>> > What do I miss here?
>>>> >
>>>> > Best regards
>>>> >
>>>> > Timothée NICOLAS
>>>>
>>>>
>>>
>>> --
>>> 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/>
>>>
>>

-- 
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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