JMH provides annotations, runners, forks, warmups, and profilers for measuring Java and JVM code while reducing common benchmark distortions. It supports Java, Kotlin, Scala, and other JVM-language benchmarks through generated harness code.
About
JMH provides annotations, runners, forks, warmups, and profilers for measuring Java and JVM code while reducing common benchmark distortions. It supports Java, Kotlin, Scala, and other JVM-language benchmarks through generated harness code.
Best for
Repeatable method, function, and command runtime benchmarks
Teams that prefer open-source licensing and self-hosting options
Groups comfortable scripting in Java, Kotlin, Scala
Not the best fit when
Teams unwilling to operate generators, results storage, and scaling
Architecture and concurrency
JMH is operated as a code benchmark harness with Java, Kotlin, Scala. It isolates functions, methods, or commands and applies repeated measurements, warmups, and statistical comparison rather than generating protocol traffic.
JMH is best for developers measuring the runtime and regressions of application code. It is open source, so teams can self-host and extend it. Vendor: OpenJDK. Deployment model: self-hosted. Free; GNU GPLv2 with Classpath Exception. Confirm details against the official site and a short proof-of-concept in your environment.
How does JMH differ from BenchmarkDotNet?
Compared with BenchmarkDotNet, scripting centers on Java, Kotlin, Scala rather than C#, F#, Visual Basic. JMH lists protocols not recorded; BenchmarkDotNet lists not recorded. Status is active versus active. Use the Test Rig to compare full specs side by side before a proof-of-concept.
What scripting language and concurrency model does JMH use?
JMH uses Java, Kotlin, Scala for scripting or scenario definition. Runtime model: code-first scenarios where virtual users execute scripted behavior under load. OS support: Windows, macOS, Linux. Protocols: not recorded. Match these to how your team already authors tests and which systems you must drive under load.
What is the cloud or enterprise path for JMH?
JMH is a focused benchmark harness rather than a browser or enterprise load controller. Use its measured workload and reporting model to isolate database or code performance before broader system testing. As open source, commercial support or hosted siblings may exist separately. Check the official site. Pricing note: Free; GNU GPLv2 with Classpath Exception.
What are known limitations of JMH?
JMH limitations to weigh: self-hosted tools require you to provision, scale, and observe load generators yourself; protocol coverage is not fully recorded in this catalog entry. Status: active. Always validate against your target protocols and scale with a proof-of-concept. Confirm details against the official site and a short proof-of-concept in your environment.