JMH microbenchmarks for OT/J

This is a set of microbenchmarks for OT/J using the JMH benchmarking harness.

Build and run

First of all, the build only works with JDK 8, but you can run the resulting benchmark with a a more recent JDK.

Disclaimer: This project uses an ugly hybrid Ant/Maven build, because at the moment, there seems to be no reliable way to build OT/J projects with Maven. Therefore, some JARs from the official OT/J distribution (licensed under the Eclipse Public License v1.0) are included. For convenience, it also ships with an Eclipse project file for easier editing. Note that the benchmark cannot and should not be executed from inside the IDE.

In order to build the "payload" (OT/J and Ant) and the benchmark (JMH and Maven), just use:

make

which calls Ant and Maven in sequence.

The benchmarks are executed as follows:

./run_benchmarks.sh
./run_benchmarks_nootj.sh

The latter one runs the benchmarks with the OT/J runtime disabled.

Runtime options

Use the -help option of run_benchmark_*.sh to see which options the JMH runner accepts. Here are some useful ones:

• ./run_benchmarks.sh -jvmArgsAppend '-Dot.dump' enables OT/J dumping of weaved classes into the otdyn directory
• ./run_benchmarks.sh -prof stack enables simple stack profiling
• ./run_benchmarks.sh -jvmArgsAppend '-XX:+UnlockDiagnosticVMOptions -XX:+PrintInlining' to see the inlining decisions of the Hotspot VM
• ./run_benchmarks.sh -jvmArgsAppend '-XX:CompileCommand=dontinline,path.to.Class::methodName' to disallow inlining of the specified method.

License

Except for the bundled *.jar files, the code in this repository is licensed under a 3-clause BSD license (see LICENSE.txt for details).