[petsc-users] SNESSetOptionsPrefix usage

[Mark Adams]

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
>
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