[SCIP] Help with setting up parallel solve in pyscipopt
Ambros Gleixner
gleixner at zib.de
Thu Apr 13 12:22:05 CEST 2023
Hi Hon Fai,
Great! And yes, we have fixed some things in the concurrent mode
recently. Can you try with the latest version of the v80-bugfix branch
on github.com/scipopt/scip ?
Best,
Ambros
Am 13.04.2023 um 01:52 schrieb Hon Fai Vuong:
> Hi Ambrose, thanks for your response. I missed that detail and made the
> change. I uninstalled the conda version of pyscipopt since it came with
> it's own version of scip. I reinstalled pyscipopt via pip and it now
> appears that pyscipopt is using the version of scip that I build from
> src. It runs normally with the optimize() function.
>
> However when I try with the concurrentopt, it segfaults and produces a
> core file. I'm not sure what to do next.
>
> -Hon Fai
>
> On Wednesday, April 12, 2023 at 05:39:55 AM PDT, Ambros Gleixner
> <gleixner at zib.de> wrote:
>
>
> Hi Hon Fai,
>
> Did you see the description at
>
> https://github.com/scipopt/PySCIPOpt/blob/master/INSTALL.md
> <https://github.com/scipopt/PySCIPOpt/blob/master/INSTALL.md>
>
> ? You may have to set `export SCIPOPTDIR=<path_to_install_dir>` in your
> shell.
>
> Best,
> Ambros
>
> Am 11.04.2023 um 21:08 schrieb Hon Fai Vuong:
> > Hello All,
> > I'm new to SCIP and wanted to try running with concurrent opt
> > mode. I'm working on Linux and was able to install the scip package via
> > cond-forge, but when I attempted to use the parallel functionality via
> > solveConcurrent(),
> >
> > I received the following warning:
> >
> > *UserWarning('SCIP was compiled without task processing interface.
> > Parallel solve not possible - using optimize() instead of
> > solveConcurrent()')*
> >
> > I read that by default SCIP isn't compiled with the TPI option, so went
> > through the process of building it after much fumbling around.
> > I can solve problems via command line with parallel mode with the
> > rebuilt version.
> >
> > My question now is how to I tell psyscipopt to use that version? I
> > naively created a symlink to point the version of scipt in my virtual
> > environment to the rebuilt version, but still running into the same
> problem.
> >
> > Any help would be appreciated.
> >
> > Thanks,
> > Hon Fai
>
> >
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