Skip to content


Subversion checkout URL

You can clone with
Download ZIP
Fetching contributors…
Cannot retrieve contributors at this time
67 lines (40 sloc) 1.81 KB


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


The top level interface is in criterium.core.

(use 'criterium.core)

Use bench to run a benchmark in a simple manner.

(bench (Thread/sleep 1000) :verbose)

By default bench is quiet about its progress. Run with-progress-reporting to get progress information on out.

(with-progress-reporting (bench (Thread/sleep 1000) :verbose))

Lower level functions are available.

(report-result (benchmark (Thread/sleep 1000)) :verbose)
(report-result (quick-bench (Thread/sleep 1000)))


API Documentation

See Elliptic Group for a Java benchmarking library. The accompanying article describes many of the JVM benchmarking pitfalls.

See Criterion for a Haskell benchmarking library that applies many of the same statistical techniques.


The library can be installed through Leiningen or through maven.

Alternatively, the source code can be compiled into a jar with leiningen.

lein jar


Serial correlation detection. Multimodal distribution detection. Use kernel density estimators?


Licensed under EPL

Jump to Line
Something went wrong with that request. Please try again.