[petsc-dev] change default KSP max iterations

[Richard Mills]

I've seen many cases where 250 iterations is not necessarily an indicator
of anything being wrong.  But, yes, 10K is ridiculous.  Why not set the
default max to 1000?  That's an order of magnitude lower than the current
default but is unlikely (I think) to cause people to start seeing puzzling
failures in codes that previously worked OK with the current default.

--Richard
On Oct 14, 2014 12:30 AM, "Lisandro Dalcin" <dalcinl at gmail.com> wrote:

> On 14 October 2014 06:30, Jed Brown <jed at jedbrown.org> wrote:
> > Barry Smith <bsmith at mcs.anl.gov> writes:
> >
> > Does the marginal value of saving seconds/minutes(?) for a solver to
> > reach 10k iterations (when you forgot to enable enough monitoring to
> > know what's happening) offset the confusion and alleged misbehavior for
> > the people that want to keep iterating?
>
> Following your reasoning, is 10k enough? While 250 is probably too
> small, I still think that 10k is too much.
>
> --
> Lisandro Dalcin
> ============
> Research Scientist
> Computer, Electrical and Mathematical Sciences & Engineering (CEMSE)
> Numerical Porous Media Center (NumPor)
> King Abdullah University of Science and Technology (KAUST)
> http://numpor.kaust.edu.sa/
>
> 4700 King Abdullah University of Science and Technology
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>
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>
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