[petsc-users] Is it possible to update SNES tolerances?

[Jed Brown]

David Knezevic via petsc-users <petsc-users at mcs.anl.gov> writes:

> I'm doing load stepping with SNES, where I do a SNES solve for each load
> step. Ideally the convergence tolerances for each load step would be set
> based on the norm of the load in the current step. As a result I would like
> to be able to update the absolute and relative tolerances on a SNES.
>
> I tried to call SNESSetTolerances at the beginning of each load step, but
> it seems (based on the -snes_view output) that the tolerances do not get
> updated. Is there a way to update the tolerances?

Did you also have SNESSetFromOptions and specify tolerances on the
command line?  SNESSetTolerances should be used unless it gets
overwritten later by a process such as SNESSetFromOptions.