Even after setting the OutputFlag parameter to 0, Gurobi may still print license information to the standard output:
Using license file /home/gurobiuser/gurobi.lic
Academic license - for non-commercial use only
This can be undesirable, especially when solving many optimization problems in sequence. Below are two ways to prevent Gurobi from printing out this information.
- Set the OutputFlag parameter to 0 before the Gurobi environment is started. To do this, create an empty Gurobi environment, set the OutputFlag parameter, then start the environment. For example, in Python, this can be done as follows:
import gurobipy as gp
with gp.Env(empty=True) as env:
env.setParam('OutputFlag', 0)
env.start()
with gp.Model(env=env) as m:
# Build model m here - Create a gurobi.env file (see here) in the current working directory of your script, and add to that file the single line
OutputFlag 0
Gurobi automatically looks in the current working directory for a gurobi.env file to use. If it finds one, it applies the listed parameters to new Gurobi environments. Thus, if you have such a gurobi.env file in the same directory as your scripts, your scripts don't need to explicitly create and start an empty environment:import gurobipy as go
with gp.Env() as env, gp.Model(env=env) as m:
# Build model m here