How does gurobi use hyperthreading?

Answered

Yiman Hou

March 18, 2022 20:19

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Hi,

I'm interested to know how does Gurobi use hyper threaded cores? For example how does Gurobi choose the number of computation threads to use in a multi job setting?

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• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 16, 2025 23:41

  This post is more than three years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum, or try Gurobot, our chatbot interface offering instant, expert-level support.
• 

  Jaromił Najman

  • Gurobi Staff

  March 21, 2022 08:07

  Gurobi uses all threads available on the machine, unless parameter Threads is set explicitly by the user. Usually, also hyperthreading is exploited by Gurobi unless there is some specific OS setting preventing this.

  It is important to limit the number of Threads used by Gurobi when running multiple jobs on 1 machine to avoid interference of solutions processes.

  Note that using an excessive amount of threads is not always best, cf. Does using more threads make Gurobi faster?

  Best regards, 
  Jaromił

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