Archives for November 2012

Using more processors does not necessarily lead to reduced run times on CPLEX

This post takes a look at performance variability issues when scaling up the number of processors assigned to the CPLEX MIP solver. I summarize results from a few computational experiments we’ve made. I show that while increasing the number of processor cores  results in quicker runs on average, but the effect on individual instances is […]

Tuning cut strategies: is it worth the effort?

When solving mixed-integer (MIP) models, one of the questions I ask myself (and I have been asked) is how good are the solver’s default parameters parameters for a given class of models. This is a rather natural question to ask when you realize how many parameters a solver has. We are constantly looking at ways […]