Controlling crossover

Documents parameters controlling barrier crossover.

The nature of the crossover step that follows barrier is controlled by the parameter barrier crossover algorithm (CPX_PARAM_BARCROSSALG, BarCrossAlg). That topic in the Parameters Reference Manual explains the possible options of the barrier crossover parameter. At its default Automatic setting, CPLEX invokes an appropriate crossover step based on the problem type and the number of threads available.

To turn off the crossover step that normally follows barrier optimization, use the parameter solution type for LP and QP (CPX_PARAM_SOLUTIONTYPE, SolutionType) documented in the Parameters Reference Manual. When you use the solution type parameter to tell CPLEX to seek a nonbasic solution, in barrier optimization, you effectively eliminate barrier crossover.