mkouba/arc-benchmarks

ArC microbenchmarks

Collection of ArC microbenchmarks written using JMH. Not peer reviewed or anything, so take the results with a grain of salt ;-)

Running

Use run-benchmarks.sh.

Running manually with Async Profiler

First, build the benchmark JAR: mvn clean package. You will find it's a plain old JMH application, try e.g. java -jar target/benchmarks.jar -h.

Then, download Async Profiler from https://github.com/jvm-profiling-tools/async-profiler. To get the 1.8.5 release for x86_64 Linux, you can run:

wget https://github.com/jvm-profiling-tools/async-profiler/releases/download/v1.8.5/async-profiler-1.8.5-linux-x64.tar.gz
tar xfz async-profiler-1.8.5-linux-x64.tar.gz

JMH has support for Async Profiler built in, you just have to make sure it can be found. One easy way is to put the Async Profiler native library to the Java native library path using -Djava.library.path.

Note that the JMH integration of Async Profiler currently (as of JMH 1.29) does not work well with Async Profiler 2.0 (output types flamegraph and jfr at least don't produce anything). That's why we use 1.8.5 here.

Also, there are some preparations necessary before running Async Profiler. Please read https://github.com/jvm-profiling-tools/async-profiler/#basic-usage.

java -Djava.library.path=./async-profiler-1.8.5-linux-x64/build -jar target/benchmarks.jar -f 1 -prof async:output=flamegraph SingleInterceptorBenchmark

Here, we use -f 1 to use only one JVM fork. With N forks, we would unfortunately not get N reports from Async Profiler, neither would we get a single combined report. The last one would win, the previous are just lost.