According to JEP 230: Microbenchmark Suite, there exists a microbenchmark suite built-in to Java 12. The JEP explains that it’s basically JMH, but without needing to explicitly depend on it using Maven/Gradle. However, it doesn’t specify how to go about accessing the classes/annotations that belong to the suite to perform a benchmark.
My questions are:
module-info.javato be able to use this suite?
Your interpretation is incorrect. The JEP says:
Add a basic suite of microbenchmarks to the JDK source code, and make it easy for developers to run existing microbenchmarks and create new ones.
i.e. this is not necessarily something that makes it into a JDK distribution, just something that is added to the source code repository to make it easier to run benchmarks on JDK code. Though, to be fair, the fact that it’s listed as one of the JDK 12 ‘features’ seems a tad misleading.
The benchmarks can be run by using the OpenJDK build system. Once you have cloned the OpenJDK source code from
https://github.com/openjdk/jdk (or another repository that includes the JEP), you can run benchmarks e.g. by using:
make test TEST="micro:java.lang.reflect"
Benchmarks are located in the
testmicro directory. See also the documentation: https://github.com/openjdk/jdk/blob/master/doc/testing.md#microbenchmarks
Also, this requires you to specify JMH and it’s dependencies when generating a build configuration:
bash configure --with-jmh="/path/to/jmh/jars"