Benchmarks for Kotlin2JVM Compiler

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Building

To build this project you need to run this

mvn -Dkotlin.version=<kotlin.version> clean compile

where <kotlin.version> is the version of Kotlin that you need to benchmark.

Running

To run specific benchmark in kotlin-module you need to run

java -jar kotlin/target/microbenchmarks.jar <benchmark-name-pattern> <jmh-options>

where <benchmark-name-pattern> is a regular expression that matches full name of benchmark (in format Class.method).

To see full list of <jmh-options> go to JMH Page

Available benchmarks

• InliningTest is available in kotlin module.

  It proofs that there are problems with inlining even in such a simple case

  There are tho methods: inliningIdeal and varInlining

• MergeSort is available both in kotlin and java modules.

• SimpleElvisTest is available both in kotlin and java modules

  It demonstrates that there are problems with combination of safe calls and elvis operators

• Stars is available both in kotlin and java modules

  Implementation of problem 1028 from Timus written in Kotlin and Java to compare performance.

  There are variations StarsFaster and StarsSemiFaster in kotlin module.

• SwitchTest is available both in kotlin and java modules.

  It demonstrates that there were problems with when operator in case of using it like switch in Java

  It contains two methods: testDenseSwitch and testSparseSwitch

Examples

To run all methods within SwitchTest benchmark you need to run

java -jar java/target/microbenchmarks.jar .*SwitchTest.* -i 10 -wi 5 -f 1
java -jar kotlin/target/microbenchmarks.jar .*SwitchTest.* -i 10 -wi 5 -f 1

There will be 5 warmup iterations and 10 main iterations for each method

To run all benchmarks you should run something like this

java -jar java/target/microbenchmarks.jar .* 
java -jar kotlin/target/microbenchmarks.jar .*