Criterium measures the computation time of an expression. It is designed to address some of the pitfalls of benchmarking, and benchmarking on the JVM in particular.

This includes: - statistical processing of multiple evaluations - inclusion of a warm-up period, designed to allow the JIT compiler to optimise its code - purging of gc before testing, to isolate timings from GC state prior to testing - a final forced GC after testing to estimate impact of cleanup on the timing results.