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Re: [Question #107349]: PETsc return code if krylof solver did not converge

 

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.

Garth

> --
> Anders
>
>
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