dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

It's a global parameter now valid for both the Krylov and Newton
solvers, but perhaps it should be a local paramer. Opinions?

--
Anders


On Fri, Apr 16, 2010 at 01:33:26PM -0000, bluejerry wrote:
> Question #107349 on DOLFIN changed:
> https://answers.launchpad.net/dolfin/+question/107349
>
>     Status: Answered => Open
>
> bluejerry is still having a problem:
> Thanks that looks better.
>
> I assume this is to be set in the 'krylov_solver' submenu? If so it is not
> in the parameter options (KeyError) in my last bzr pull (today)
>
> Unless there is something I am missing.
>
> Renier
>
> On Thu, Apr 15, 2010 at 9:00 PM, Anders Logg <
> question107349@xxxxxxxxxxxxxxxxxxxxx> wrote:
>
> > Question #107349 on DOLFIN changed:
> > https://answers.launchpad.net/dolfin/+question/107349
> >
> > Anders Logg proposed the following answer:
> > On Wed, Apr 14, 2010 at 11:50:36AM +0200, Anders Logg wrote:
> > > On Wed, Apr 14, 2010 at 09:33:20AM -0000, Garth Wells wrote:
> > > > Question #107349 on DOLFIN changed:
> > > > https://answers.launchpad.net/dolfin/+question/107349
> > > >
> > > > Garth Wells proposed the following answer:
> > > >
> > > > On 14/04/10 17:17, Anders Logg wrote:
> > > > > On Wed, Apr 14, 2010 at 07:17:44AM -0000, bluejerry wrote:
> > > > >> New question #107349 on DOLFIN:
> > > > >> https://answers.launchpad.net/dolfin/+question/107349
> > > > >>
> > > > >> Is it possible to receive some sorf of error feedback when a
> > solution did not converge while using the Krylov solver. A warning is
> > printed by the PETsc solver that it did not converge, but I can't seem to
> > find a way to detect this programatically. The solve method returns a
> > Function even if the solver did not converge.
> > > > >>
> > > > >> Thank you
> > > > >>
> > > > >> Renier
> > > > >
> > > > > We had a similar problem with the Newton solver last week. It didn't
> > > > > converge but we thought it did.
> > > > >
> > > > > I would also like to see an error when the solver doesn't converge.
> > > > >
> > > >
> > > > Just an error is bad. Presently, a warning message is printed, but we
> > > > can add a parameter to switch between error/warning.
> > >
> > > Sounds good. I think it should be set to error by default with the
> > > possibility to change it to a warning. That is safest for first time
> > > users. Someone with a little more experience would check for
> > > convergence and have a strategy for handling the case where things
> > > don't converge (change of parameters, time step etc).
> >
> > Done. The parameter name is "error_on_nonconvergence".
> >
> >
> >
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>

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