The ILOG CPLEX Parallel Barrier Optimizer achieves significant speedups over its serial counterpart (the ILOG CPLEX Barrier Optimizer described in Solving LP Problems with the Barrier Optimizer, and in Chapter 7, Solving Quadratic Programming Problems) on a wide variety of classes of problems. Consequently, the parallel barrier optimizer will be the best LP choice on a parallel computer more frequently than on a single-processor. For that reason, you should be careful not to apply performance data or experience based on serial optimizers when you are choosing which optimizer to use on a parallel platform.

If you decide to use the parallel barrier optimizer on the subproblems of a MIP, see also other special considerations about nested parallelism in Nested Parallel Processing.