JMH Demo

JMH is short for Java Microbenchmark Harness. JMH is a toolkit that helps you implement Java microbenchmarks correctly.

Summary

Java Microbenchmarks are Hard because there are many optimizations that the JVM or underlying hardware may apply to your component when the benchmark executes that component in isolation.

Writing a correct Java microbenchmark typically entails preventing the optimizations the JVM and hardware may apply during microbenchmark execution which could not have been applied in a real production system. That is what JMH - the Java Microbenchmark Harness - is helping you do.

Running Your JMH Benchmarks

java -jar target/benchmarks.jar

JMH Benchmark Modes

• Throughput
• Average Time
• Sample Time
• Single Shot Time
• All

The default benchmark mode is Throughput.

References

• JMH - Java Microbenchmark Harness