Purpose

The purpose of the repository is to compare build time and performances of Kotlin on various platforms:

• Kotlin/JVM
• Kotlin/Native
• Kotlin/JVM compiled to native using GraalVM native image compiler
• Kotlin/Wasm

It is based on simple program generating pairs of twin primes from https://discuss.kotlinlang.org/t/why-is-kotlin-native-much-slower-than-jvm/10226/10.

Data points

Platform	Build time	Execution time	Artifact size	peak RSS
Kotlin/JVM	13s	58s	1.9 MB + JDK	606 MB
GraalVM CE native	15.3s	2m25	12.4 MB	61 MB
Kotlin/Native	38s	3m03s	0.57 MB	6 MB
Kotlin/Wasm preview	11s	2m12	0.18 MB + Node	109 MB

Environment

• MacBook Pro M1 14" 2021
• GraalVM CE 22.3.0 (build 17.0.5+8-jvmci-22.3-b08)

Getting started

Notice I was not able to use a single Gradle multiplatform build due to a conflict between Kotlin/Native and Native Build Tools plugins.

Kotlin/JVM

Compile

./mvnw clean package

Run

java -jar target/prime-multiplatform-1.0-SNAPSHOT-jar-with-dependencies.jar

Kotlin/JVM with GraalVM native image

Compile

./mvnw clean native:compile

Run

target/prime-multiplatform 

Kotlin/Native

Compile

./gradlew clean linkReleaseExecutableNative

Run

java -jar target/prime-multiplatform-1.0-SNAPSHOT-jar-with-dependencies.jar

Kotlin/Wasm

Compile

./gradlew clean wasmMainClasses

Run

./gradlew wasmNodeProductionRun