Is Barrier method deterministic for multiple threads?

Answered

Bodo Lipp

March 14, 2024 15:10

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For solving LPs I use the Barrier method from Gurobi. I work on a Server with multiple threads and ran a computation twice with different number of threads. Here I got different results in the sense that one optimization took roughly 100 iterations whereas the other one had 120 iterations. The input should have been the same on both calculations. Therefore I was wondering if the Barrier method is deterministic if different number of threads are used?

Related to

• Barrier
• Deterministic

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• Official comment

  

  Jaromił Najman

  • Gurobi Staff

  March 15, 2024 08:15 Edited

  Hi Bodo,

  Please refer to Is Gurobi deterministic?

  As long as you solve the same model on the same machine with the same parameters, you will get the same result.

  Since you changed the number of threads, you may see a different solution path.

  Best regards, 
  Jaromił

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