Querying for solver time before B&B starts?

Answered

Nicolai Schjørring

May 07, 2023 20:11

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Is there a way for me to query the solver for the time spent prior to starting the branch and bound tree (So from solver launch, till root relaxation is solved)? I'm dealing with a problem, which has a lot of variance in instance size, and I want control the amount of time spent in B&B.

Kind regards,

Nicolai.

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  Elisabeth Rodríguez Heck

  • Gurobi Staff

  May 09, 2023 08:36

  Hi Nicolai,

  You can use Callbacks to do this. For this, you should query the RUNTIME at the "where" values that come before Gurobi enters the Branch-and-Bound (PRESOLVE, SIMPLEX, BARRIER). See Callback Codes for more information on the "where" and "what" values and callback.py and tsp.py for Python code examples on how to use callbacks.

  Best regards,

  Elisabeth

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  Nicolai Schjørring

  May 14, 2023 14:16

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  Thanks a lot, I managed to get it working.

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