[petsc-users] SNESSetOptionsPrefix usage

[Timothée Nicolas]

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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