The ILOG CPLEX Parallel Barrier Optimizer achieves significant speedups over its serial counterpart on a wide variety of classes of problems. (The serial Barrier Optimizer is introduced in Solving LPs: Barrier Optimizer, and explored further in Solving Problems with a Quadratic Objective (QP) and in Solving Problems with Quadratic Constraints (QCP).) Consequently, the parallel barrier optimizer will be the best continuous 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.
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