Probing
While most of the suggestions in this section are oriented toward overcoming specific obstacles, the probing parameter can help in many different ways on difficult models. Probing is a technique that looks at the logical implications of fixing each binary variable to 0 or 1. Probing can be expensive, so this parameter should be used selectively. On models that are in some sense easy, the extra time spent probing may not reduce the overall time enough to be worthwhile. On difficult models, probing may incur very large runtime costs at the beginning and yet pay off with shorter overall runtime. When you are tuning performance, it is usually because the model is difficult, and then probing is worth trying.
When the probing parameter is set to 1 (one), CPLEX performs a limited amount of probing (to limit probing runtime); when set to 2, the full amount of probing implemented in CPLEX is performed.
To activate probing::
