Releasing the GIL in Python API

Since Gurobi version 9.1, the Global Interpreter Lock (GIL) is released during the optimization process which takes place on a lower level.

This enables user programs to execute other Python code in a separate Python thread while Gurobi's optimizer is running. Keep in mind that gurobipy is not thread-safe so you must not run any other Gurobi commands while the optimization is still in progress.

Further information:

• Gurobi 9.1 released
• What Is the Python Global Interpreter Lock (GIL)?
• How do I use multiprocessing in Python with Gurobi?