Limit core usage for Gurobi

Answered

Yichen Xu

• March 21, 2023 14:58

Hi, 

I'm using Gurobi with Python interface, and I have a WLS license. 

Since my laptop has low specs, I'm running my scripts on a server. I'm getting the following error message:

GurobiError: Requested number of cores (18) is greater than allowed (8) cores

I also tried to limit the usage of cores to 8 by:

    with gb.Env(empty=True) as env:
        env.setParam('OutputFlag', 0)
        env.setParam('Threads', 8)    #Limit the number of cores used according to the license
        env.start()
        with gb.Model(env=env) as a:

But it doesn't work. 

What I want to know is, is there any problem with my code, or my WLS license can't work when I want to use it on a computer that has more cores than allowed? 

Thanks in advance!

Related to

• WLS (Web License Service)

1

• 

  David Torres Sanchez

  Gurobi Staff

  • March 21, 2023 18:49

  Hi Yichen,
  
  I have created an internal ticket to fix this issue.
  
  Cheers, 
  David

  0
• 

  James Walsh

  • March 23, 2023 12:03
  • Edited

  I also have this issue with WLS license in WSL2 env, attempted on the optimiser object via pyomo:

  opt = SolverFactory(SET_SOLVER)
  opt.options["cores"] = 8
  opt.options["threads"] = 8
  results = opt.solve(model, tee=True)

  Results in

  gurobipy.GurobiError: Requested number of cores (10) is greater than allowed (8) cores

  1
• 

  David Torres Sanchez

  Gurobi Staff

  • March 23, 2023 12:16

  I'll create another ticket for you.
  Anyone else with this issue, please see How do I resolve an "ERROR 10009: License is for 8 cores, machine has XX"?
  
  Cheers, 
  David

  1

Please sign in to leave a comment.