Skip to main content

Calculating on Multiple Cores

Ongoing

Comments

4 comments

  • Matthias Miltenberger
    Gurobi Staff Gurobi Staff

    Hi Theresa,

    Do you mind sharing log files of these runs? Please note that it's not always guaranteed to get a performance increase when using more cores. Often there are other limiting factors like single-core performance or memory throughput.

    Cheers,
    Matthias

    0
  • Tessa Meyer
    First Comment
    Gurobi-versary
    First Question

    Hi Matthias.

    Well, the problem is that I can not directly interact with gurobi as there is an other framework in between. So I can not see the progress right now.

    It is actually using a lot of RAM.

    0
  • Matthias Miltenberger
    Gurobi Staff Gurobi Staff

    Well, then I don't think we can help you very much, Theresa. It seems you are solving a pretty hard model and sometimes this does take a lot of time.

    I suggest creating a smaller version of that model and check for some parameter tuning opportunities.

    You should definitely try to inspect the log file of that 9-hour run to find some clues about performance bottlenecks.

    Cheers,
    Matthias

    0
  • Tessa Meyer
    First Comment
    Gurobi-versary
    First Question

    Hi.

    Okay. I also have another model that takes about 5 hours on a 4-core-workstation. On a cluster (24-core-machine) it is still running after 20 hours using 40 GB RAM on average. Gurobi "is designed to effectively exploit multiple cores". Why are more cores less efficient?

    0

Please sign in to leave a comment.

Powered by Zendesk