[Scip] solution times

[Todd Niven]

Hi Timo,

I've attached the necessary files to run the model. I am using the
python-zibopt interface with python3.2.
The run.py script will run the model for 10 seconds and then run again in
`first solution' mode.
On my machine, the `first solution' run takes roughly 60 seconds, not 45 as
I originally stated.

Cheers,

Todd

On 18 February 2013 17:50, Timo Berthold <berthold at zib.de> wrote:

> Hi Todd,
>
> your understanding is correct, but like always, life can be more
> complicated. ;-)
> What might have happened: The solutions are found be a heuristic which
> itself takes a considerable amount of running time.
> Normally it would be finished after 45 seconds total running time and
> present the solution it could construct. If however, it is interrupted due
> to your time limit, it will still check whatever it has at this point
> (e.g., a partial solution) for feasibility.
>
> Could you send me the log files and maybe a model file of your problem to
> verify this hypothesis?
>
> Best
> Timo
>
> > I am solving a mixed integer problem with a single quadratic constraint
> > (this constraint is in fact the objective which is a sum of bilinear
> > terms)
> > using SCIP2.1 and the output for solution times is puzzling me.
> >
> > I have an instance where if I ask SCIP to find me 1 solution it halts
> > after
> > 45 seconds and outputs a feasible solution. However, if I ask SCIP to run
> > for 10 seconds, it finishes and outputs a feasible solution. This
> solution
> > is not as good as the one obtained after 45 seconds. I was under the
> > impression that if I asked SCIP to halt after finding 1 solution, it
> would
> > halt after finding the first solution, however this does not seem to be
> > the
> > case. This may have already been discussed and if so, I apologize for the
> > duplication.
> >
> > Thanks,
> >
> > Todd
> > _______________________________________________
> > Scip mailing list
> > Scip at zib.de
> > http://listserv.zib.de/mailman/listinfo/scip
> >
>
>
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