Gurobi 9.1.1 only uses a single thread in MIP mode

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  • Jaromił Najman

    The drop which you see in the core usage is actually an improvement. What you see with version 9.1.1 is that the parallel threads have finished their work at the root node and are released to make them usable by the overall system. Once the main thread finishes its work in the root node, the additional threads are re-used again in the actual B&B procedure, i.e., when the number of nodes in the tree gets larger than 0.

    What you see in version 9.0.3 is that although these threads have finished their work in the root node and are waiting for the main thread to finish, they are not freed and are thus kept occupied for no real reason.

    Best regards,
    Jaromił

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