Test GraalVM with simple Scala Apps

Tutorial

1. Setup GraalVM - https://www.graalvm.org/docs/getting-started/

Tested on 1.0.0-rc1 EE.

2. Enable GraalVM PATH

export PATH=/path/to/graalvm-1.0.0-rc1/Contents/Home/bin:$PATH

3. Assembly sample apps

cd scala-helloworld
sbt assembly
cd ..

cd scala-cli
sbt assembly
cd ..

4. Run on JVM

scala-helloworld:

cd scala-helloworld
time java -jar target/scala-2.12/scalahw-assembly-0.1.0-SNAPSHOT.jar A B C D
cd ..

=>

Hello World: A, B, C, D
1.87s user 0.20s system 204% cpu 1.018 total

scala-cli:

cd scala-cli
time java -jar target/scala-2.12/scalacli-assembly-0.1.0-SNAPSHOT.jar gen -o /tmp
cd ..

=>

Opts: AppOptions(/tmp,Some(gen))
2.13s user 0.23s system 215% cpu 1.094 total

5. Build native images

cd scala-helloworld
native-image -jar target/scala-2.12/scalahw-assembly-0.1.0-SNAPSHOT.jar
cd ..

cd scala-cli
native-image -jar target/scala-2.12/scalacli-assembly-0.1.0-SNAPSHOT.jar
cd ..

6. Run binaries

scala-helloworld:

time scala-helloworld/scalahw-assembly-0.1.0-SNAPSHOT A B C D

=>

Hello World: A, B, C, D
0.01s user 0.01s system 42% cpu 0.045 total

scala-cli:

time scala-cli/scalacli-assembly-0.1.0-SNAPSHOT gen -o /tmp

=>

Opts: AppOptions(/tmp,Some(gen))
0.01s user 0.02s system 45% cpu 0.053 total

Found uncompatible scala features

0. See general Java limitations here.

1. DelayInit trait

object MyApp extends App {
    //...
}

because of generated delayedInit method inside scala.App.

Workaround: use simple Object with main(args Array[String]) method.

TODO

Test more complicated apps:

• cli tool
• scala features: pattern matching, implicits, HKT
• scala/python interopt + native image
• scala/js interopt + native image
• ...