[petsc-users] SNESSetOptionsPrefix usage

[Matthew Knepley]

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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