[petsc-users] Test convergence with non linear preconditioners

[Matthew Knepley]

On Wed, Aug 5, 2020 at 2:59 PM Adolfo Rodriguez <adantra at gmail.com> wrote:

> I am trying to use non-linear preconditioners in a very similar way shown
> in the paper "Composing scalable nonlinear solvers" by Peter Brune and
> others.
>
> My question is simple, actually. I have provided a test convergence
> function, but it seems that the inner method does not take it into account
> and follows the default convergence criteria. Is there a way to specify a
> convergence function to the inner method?
>
> Appreciate any hints on this.
>

This is a good question. Currently, we do not have an alternative to just
pulling out the inner solver and setting it directly. I don't
think the right thing is to have inner solvers follow outer solvers since
frequently they have much different convergence requirements.
Maybe we could provide a function name in an options and have it looked up
dynamically.

What do people think about that?

  Thanks,

     Matt


> Regards,
>
> Adolfo
>


-- 
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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