GUROBI General Parameter Options

You can change the general options for GUROBI by choosing GUROBI parameters from the Options menu and then pressing the General tab. This will display the dialog box shown below:

Figure 4.61: The General Tab in the GUROBI Options Dialog Box

List of Options

Option Name MPL Name Solver Param ParamNr Type Default Min Max
Algorithm OptimizeAlgorithm METHOD 1 list -1 -1 4
IISMethod IISMethod IISMETHOD 20 list -1 -1 1
Threads Threads THREADS 8 int 0 0 1024
Time Limit SolTimeLimit TIMELIMIT 15 real MAXREAL 0.0 MAXREAL
Iteration Limit IterationLimit ITERATIONLIMIT 14 real MAXREAL 0.0 MAXREAL
Objective cutOff Limit ObjectiveCutOff CUTOFF 13 real MAXREAL -MAXREAL MAXREAL
Log Interval LogFrequency DISPLAYINTERNAL 11 int 5 1 MAXINT
Log File Name FileName string *.log


Description of Options

Algorithm

The algorithm option selects which algorithm to use when solving LP problems.

Automatic (-1) Automatically determines LP method.
Primal Simplex (0) Use the Primal Simplex method.
Dual Simplex (1) Use the Dual Simplex method.
Barrier (2) Use the Barrier method.
Concurrent (3) Use the Concurrent approach.
Deterministic Concurrent (4) Use the Deterministic Concurrent approach.

IISMethod

Chooses the IIS method to use.

Automatic (-1) Automatically determines IIS method.
Faster (0) Generally faster IIS method.
Smaller (1) Generates a smaller IIS.

Threads

Controls the number of threads to apply to parallel MIP and/or Barrier. The default value of 0 sets the thread count equal to the maximum value, which is the number of processors in the machine. A value of 0 uses one thread.

Time Limit

Limits the total time expended (in seconds).

Iteration Limit

Limits the number of simplex iterations performed.

Objective cutOff Limit

Sets a target objective value; optimization will terminate if the engine determines that the optimal objective value for the model is worse than the specified cutoff.

Log Interval

Controls the frequency at which log lines are printed (in seconds).

Log File Name

Determines the name o fthe log file, default is the model name with extension (*.log).


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