Running GraalJS on stock JDK11

This is a simple Gradle project that demonstrates how it's possible to run GraalJS on a stock JDK11. The application is a simple JavaScript benchmark embedded in a Java application which compares performance of GraalJS and Nashorn.

Pre requirements

• Linux or Mac OS
• JDK11

Setup

• Clone this repository

git clone https://github.com/graalvm/graal-js-jdk11-gradle-demo.git

• Move to the newly cloned directory

cd graal-js-jdk11-gradle-demo

• Make sure that JAVA_HOME is pointed at a JDK11 (you can run the benchmark with older JDKs as well, but Graal won't be used)

export JAVA_HOME=/path/to/jdk11; java -version

Execution

The project provides a custom JavaExec run task which sets up the JVM to use the Graal compiler to JIT compile JavaScript for better performance. You can turn off this behaviour by setting the system property graal to off. The execution outputs benchmark results for GraalJS (via the GraalVM Polyglot API and the Java Scripting API) and Nashorn.

To Execute with Graal, run

./gradlew run

To Execute without Graal, run

./gradlew run -Dgraal=off

The benchmark prints the time per iteration in milliseconds, so lower values are better.

Running on GraalVM

This project is also setup to run on GraalVM. The setup is the same except that your JAVA_HOME should point to a directory contain GraalVM. In this case, the graal system property has no effect since Graal is always available.