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Empty Environment


Empty Environment

Some parameters must be set before the Gurobi environment is fully configured. For example, creating a Compute Server environment requires you to first indicate the name of the server. This can be done through the Gurobi license file (gurobi.lic), but we also provide a means of doing this through the programming language APIs. Specifically, you can do this using an empty environment.

The first step is to construct the empty environment. This is done using GRBemptyenv in C, or through one of the provided GRBEnv constructors in the object-oriented interfaces. You then set parameters on this environment using the standard parameter API. Finally, you start the environment, using the GRBstartenv in C, or using the env.start() method in the object-oriented interfaces.

To give a simple example, if you'd like your Python program to offload the optimization computation to a Compute Server named server1, you could say:

  env = Env(empty=True)
  env.setParam(GRB.Param.ComputeServer, "server1:61000")
  env.setParam(GRB.Param.ServerPassword, "passwd")
  env.start()
  model = read("misc07.mps", env)
  model.optimize()

An equivalent Java program would look like this:

  GRBEnv env = new GRBEnv(true);
  env.set(GRB.StringParam.ComputeServer, "server1:61000");
  env.set(GRB.StringParam.ServerPassword, "passwd");
  env.start();
  GRBModel model = new GRBModel(env, "misc07.mps");
  model.optimize();