opentelemetry-java/docs/jmh.md

how to jmh

[jmh] (Java Benchmark Harness) is a tool for running benchmarks and reporting results.

opentelemetry-java has a lot of micro benchmarks. They live inside jmh directories in the appropriate module.

The benchmarks are run with a gradle plugin.

To run an entire suite for a module, you can run the jmh gradle task.
As an example, here's how you can run the benchmarks for all of the sdk trace module.

`./gradlew :sdk:trace:jmh`

If you just want to run a single benchmark and not the entire suite:

./gradlew -PjmhIncludeSingleClass=BatchSpanProcessorBenchmark :sdk:trace:jmh