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Caliper is Google's open-source framework for writing, running and viewing the results of JavaMicrobenchmarks.

• Project: https://code.google.com/p/caliper/
• Code: git clone https://code.google.com/p/caliper/
• Download: https://code.google.com/p/caliper/downloads/list
• About Microbenchmarks: https://code.google.com/p/caliper/wiki/JavaMicrobenchmarks
• Javadoc: http://caliper.googlecode.com/svn/static/api/reference/com/google/caliper/package-summary.html

The latest release is 1.0-beta-1. It can be downloaded as a single uberjar or referenced as a maven dependency:

    <dependency>
      <groupId>com.google.caliper</groupId>
      <artifactId>caliper</artifactId>
      <version>1.0-beta-1</version>
    </dependency>

The simplest complete Caliper benchmark looks like this:

    public class MyBenchmark extends Benchmark {
      public void timeMyOperation(int reps) {
        for (int i = 0; i < reps; i++) {
            MyClass.myOperation();
        }
      }
    }

See the examples in examples/src/main/java/examples, notably:

• DemoBenchmark.java -- an annotated example
• NoOpBenchmark.java -- ze goggles, zey do nussing! The absolute minimal benchmark, does nothing but time the rep loop.
• MessageDigestCreationBenchmark -- runs with several parameters
• ArraySortBenchmark.java -- example of assembling complex input before running

1. Get a local copy of the caliper repository with this command:

    git clone https://code.google.com/p/caliper/
   

   cd caliper

2. To build this project with Maven:

    cd caliper
    mvn eclipse:configure-workspace eclipse:eclipse install
   

3. To build examples:

    cd examples
    mvn eclipse:configure-workspace eclipse:eclipse install
   

Run the included 'caliper' script, passing in classnames to benchmark:

    cd examples
    ../script/caliper examples.ArraySortBenchmark examples.DemoBenchmark.java

Or use maven directly; set 'exec.args' to the classname to benchmark

    cd examples
    mvn compile exec:java -Dexec.mainClass=com.google.caliper.runner.CaliperMain -Dexec.args=examples.ArraySortBenchmark

Apache License Version 2.0, January 2004 -- see the file COPYING in this directory