How To Speed Up Clojure Hello World 100x Using GraalVM

fast-clojure-hello-world-using-graal-vm.md

How To Speed Up Clojure Hello World 100x Using GraalVM

Performance

Version	Command	Time (seconds)
Java	time java -jar target/fastclj-1.0-standalone.jar	1.354
GraalVM	time ./fastclj-1.0-standalone	0.014

Details

# Create project.
lein new fastclj; cd fastclj

# Create project.clj.
cat<<'END'>./project.clj
(defproject fastclj "1.0"
  :description "Fast hello world using GraalVM"
  :dependencies [[org.clojure/clojure "1.9.0"]]
  :main fastclj.core
  :aot  :all)
END

# Create core.clj.
cat<<'END'>./src/fastclj/core.clj
(ns fastclj.core (:gen-class))
(defn -main [& args] (println "Hello world!"))
END

# Compile jar.
lein compile && lein uberjar

# Test jar perf.
time java -jar target/fastclj-1.0-standalone.jar

# Download GraalVM and untar.
wget https://github.com/oracle/graal/releases/download/vm-1.0.0-rc12/graalvm-ce-1.0.0-rc12-macos-amd64.tar.gz
tar zxvf graalvm-ce-1.0.0-rc12-macos-amd64.tar.gz

# Path to GraalVM binaries.
GRAAL_BIN="$PWD/graalvm-ce-1.0.0-rc12/Contents/Home/bin"

# Create native image from jar. 
$GRAAL_BIN/native-image \
  -H:+ReportUnsupportedElementsAtRuntime \
  -J-Xmx3G -J-Xms3G --no-server \
  -jar target/fastclj-1.0-standalone.jar

# Inspect relative sizes.
ls -l ./fastclj-1.0-standalone target/*.jar

# Test perf of GraalVM-produced executable.
time ./fastclj-1.0-standalone