[petsc-users] SNESSetOptionsPrefix usage

[Timothée Nicolas]

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.

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/>
>>
>
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