[Scip] Threads and incremental solutions

[Raphael C]

Hi,

>
>> 1) Is it possible to use more than one core?
> you can do this via the ug framework which comes with the SCIP
> optimization Suite 3.0 / 3.0.1, but this won't work together with the
> python interface.

I tried fscip from the command line however it fails immediately with
a memory error. Does it require a 64 bit system (for historical
reasons my system is still running 32 bit linux).

>> 2) In a very long running optimization where a feasible solution is
>> found quickly, can scip output its best feasible solution so far as it
>> goes along?
> You already see the SCIP output and how the primal bound changes, but
> you also want to see the solution values of all variables whenever SCIP
> finds a new solution? There is no method within SCIP to do that, but you
> can easily implement it within SCIP as an event handler. Please have a
> look at the Eventhdlr example, in particular src/event_bestsol.c, in
> which you would need to print the solution via SCIPprintSol() instead of
> printing a message via SCIPinfoMessage(). Also, you could stop the
> solving process, print the current best solution and restart the
> solving, but I'm not sure whether this is possible via the python code.
>
Thank you. I will take a look at that.

> Do you need to build the problem, start the optimization and evaluate
> the results from within python? If you just want to model a problem and
> run it, you might want to try out ZIMPL, the modeling language of the
> SCIP Optimization Suite.
>
At the moment, as I haven't managed to get the python interface to
compile yet, I am creating the lp file in python and writing it to a
file.

Thanks for the help.

Raphael