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[Garth Wells <question107349@xxxxxxxxxxxxxxxxxxxxx>]

Question #107349 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/107349

Garth Wells proposed the following answer:

On 16/04/10 18:51, Anders Logg wrote:
> Question #107349 on DOLFIN changed:
> https://answers.launchpad.net/dolfin/+question/107349
>
>      Status: Open =>  Answered
>
> Anders Logg proposed the following answer:
> It's a global parameter now valid for both the Krylov and Newton
> solvers, but perhaps it should be a local paramer. Opinions?

It should definitely be possible to set it independently for different 
instances of Krylov solvers and Newton solvers.

Garth

>
> --
> 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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