Jed Brown wrote:
>> On Wed, 17 Sep 2008, Derek Gaston wrote:
>>> Another problem is with setting command-line options... I'm calling
>>> KSPSetTolerances and SNESSetTolerances now... using the values
>>> specified in the equation systems parameters. It appears that those
>>> values override any co
On Thu 2008-09-18 07:57, Derek Gaston wrote:
> From a research perspective you are absolutely right. What you probably
> aren't considering is that some people (e.g. me) are trying to build
> commercial / production codes on top of libMesh / PetsC and from that
> standpoint you want to have
On Sep 17, 2008, at 3:39 PM, Roy Stogner wrote:
> Yeah, oxymorons don't quite pass my "non-confusing" criterion. ;-)
>
> "nonlinear solver initial linear tolerance",
> "nonlinear solver linear maximum iterations"?
>
> Still confusing, and I'm open to better ideas, but at least this way
> the cont
On Sep 18, 2008, at 2:33 AM, Jed Brown wrote:
>> Exactly.
>
> Motivation to use Eisenstat-Walker?
Indeed - I used this option yesterday and it worked well for several
of our problems.
> If you set these *before* you call SNESSetFromOptions() then the
> command
> line options will be used if
On Wed 2008-09-17 16:10, Roy Stogner wrote:
>
> On Wed, 17 Sep 2008, Derek Gaston wrote:
>
> > This causes some trouble during non-linear solves as you end up
> > _way_ over solving the initial non-linear steps
>
> Exactly.
Motivation to use Eisenstat-Walker?
> > Another problem is with settin
On Wed, 17 Sep 2008, Derek Gaston wrote:
> On Sep 17, 2008, at 3:10 PM, Roy Stogner wrote:
>> I'm not sure how to rename things to reflect that in a non-confusing
>> way, though.
> "nonlinear linear solver tolerance"
> "nonlinear linear solver maximum iterations"
> etc...
Yeah, oxymorons don'
On Sep 17, 2008, at 3:10 PM, Roy Stogner wrote:
>> (which in our case actually leads to non-convergence in some cases).
>
> Really? Then they're doing it wrong.
Well... it doesn't lead to divergence... it's just that we have some
highly non-linear problems that if you oversolve the first couple
On Wed, 17 Sep 2008, Derek Gaston wrote:
> It looks like for the linear solver tolerances there are defaults
> specified in equation_systems.C. Similarly I have defined defaults
> for all the non-linear tolerances. The trouble is that TOLERANCE *
> TOLERANCE for "linear solve tolerance" is quit
So... I've implemented the ability to set all those non-linear
solver tolerances... but now I'm left wondering what to do with
defaults and command-line options.
It looks like for the linear solver tolerances there are defaults
specified in equation_systems.C. Similarly I have defined d
