SBT Benchmark

Run JMH benchmarks from within SBT.

Getting Started

Create a new file project/benchmark.sbt for the benchmark SBT plugin:

addSbtPlugin("net.tixxit" %% "sbt-benchmark" % "0.1.1")

libraryDependencies ++= Seq(
  "org.openjdk.jmh" % "jmh-core" % "1.0",
  "org.openjdk.jmh" % "jmh-generator-bytecode" % "1.0")

Add the BenchmarkPlugin.benchmark.settings to your project settings:

import net.tixxit.sbt.benchmark.BenchmarkPlugin._

lazy val myProject = Project(
  ...
).settings(benchmark.settings)

Write some JMH benchmarks in myProject/src/benchmark/....

Running your benchmarks:

benchmark:benchmark

Gotchas

This is implemented as a 2 step compilation process, since benchmarking tools like JMH require the class files exist so it can generate wrappers for the benchmarks. The current implementation uses JMH for source generation in SBT for the benchmark configuration. This means the precompilation step cannot use source generators from the benchmark configuration, which means that you cannot use SBT source generation to generated code required by the benchmark from within the benchmark -- at least not directly.

I think we can actually hack around this by using the (re)source generators from benchmark too, but filter out the JMH source generation tasks.