[petsc-users] SNESSetOptionsPrefix usage

[Timothée Nicolas]

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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