Hi Lukas,
From what you describe, I cannot tell what is going to. To investigate it would be very helpful, if you could provide the model file in MPS format. If you don't like to post it here, you can also send it support[at]
gurobi.com. If it is too large for sending, please let us know.
> is there a separate parameter to control the number of threads used in earlier phases?
No, the only parameter to control the number of threads is the "Thread" parameter.
> Or can these just not be run in parallel?
If Gurobi only uses one thread and you allowed more, this normally means that the things Gurobi is doing cannot be parallelized efficiently.
Thanks and best regards,
Sonja
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Dr. Sonja Mars
Gurobi Optimization
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