graalvm.md

GraalVM

• GraalVM #ril

  High-performance polyglot VM

  • GraalVM is a universal virtual machine for running applications written in JavaScript, Python, Ruby, R, JVM-based languages like Java, Scala, Groovy, Kotlin, Clojure, and LLVM-based languages such as C and C++.

    GraalVM removes the isolation between programming languages and enables interoperability in a SHARED RUNTIME.

    不只是 JVM-based language，而且不同語言間可以在同一個 runtime 裡交互作用!! 這裡對 Python 的支援並不是 Jython，而是 graalvm/graalpython。

  • It can run either standalone or in the context of OpenJDK, Node.js or Oracle Database.

    "in the context" 是指內嵌在其他環境下 (embeddable)；已經有人寫好一些環境的介接 ...

  What does GraalVM do?

  • Polyglot

    ZERO OVERHEAD interoperability between programming languages allows you to write polyglot applications and select the best language for your task.

    const express = require('express');
    const app = express();
    app.listen(3000);
    app.get('/', function(req, res) {
      var text = 'Hello World!';
      const BigInteger = Java.type(
        'java.math.BigInteger');
      text += BigInteger.valueOf(2)
        .pow(100).toString(16);
      text += Polyglot.eval(
        'R', 'runif(100)')[0];
      res.send(text);
    })
    

  • Native

    NATIVE IMAGES compiled with GraalVM ahead-of-time improve the startup time and reduce the memory footprint of JVM-based applications.

    $ javac HelloWorld.java
    $ time java HelloWorld
    user 0.070s
    $ native-image HelloWorld
    $ time ./helloworld
    user 0.005s
    

  • Embeddable

    GraalVM can be embedded in both MANAGED and native applications. There are existing INTEGRATIONS into OpenJDK, Node.js and Oracle Database.

    import org.graalvm.polyglot.*;
    public class HelloPolyglot {
      public static void main(String[] args) {
        System.out.println("Hello Java!");
        Context context = Context.create();
        context.eval("js",
          "print('Hello JavaScript!');");
      }
    }
    

• GraalVM - Wikipedia #ril

參考資料 {: #reference }

• GraalVM
• oracle/graal - GitHub