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Java 2019/11/23 JJUG CCC 2019 Fall LINE Fukoka

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• • LINE Fukuoka • @kis • Hatena (nowokay.hatenablog.com)

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• # "!' & • Java# • # • • Java 14 $ %

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• # "!' & • Java# • # • • Java 14 $ %

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• $'# :8" @)74. • /6$'# "& 2 • ,> ;(*8 • "0B< • % !15 ?+ • -=9<3A

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• # "!' & • Java# • # • • Java 14 $ %

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Java • JVM • • • (JIT) Java Bytecode loading class interpret profile generate native code internal expression profile data native code Execute on CPU

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• # "!' & • Java# • # • • Java 14 $ %

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• • JIT • JIT •

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• or • • OpenJDK CDS(Class Data Sharing) Java Bytecode loading class interpret profile generate native code internal expression profile data native code Execute on CPU !

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Class Data Sharing • Java 5 Bootstrap CDS • Java 10 App CDS(JEP 310) • % • Java 12 Default CDS(JEP 341) • Bootstrap CDS &( • '$ • Java 13 Dynamic CDS(JEP 350) • ! CDS#"

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JIT • JVM • • Alibaba Dragonwell - JWarmup Java Bytecode loading class interpret profile generate native code internal expression profile data native code Execute on CPU

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JIT • JIT JVM • • OpenJ9 • Azul Zing - Falcon JIT Java Bytecode loading class interpret profile generate native code internal expression profile data native code Execute on CPU

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JIT • JITJIT • OpenJ9 • JIT as a Service(JITaaS) • https://www.youtube.com/watch?v=gx8DVVFPkcQ

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• AOT(Ahead of Time compile) • Java • • GraalVM native image • Java 9 AOT (JEP 295) Point to analysis Java Bytecode loading class generate native code internal expression native code Execute on CPU Run initialization Heap snapshot

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JITAOT JIT AOT $ #! " CPU &%'

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AOT • • JIT AOT Java Bytecode loading class interpret profile generate native code internal expression profile data native code Execute on CPU Point to analysis Java Bytecode loading class generate native code internal expression native code Execute on CPU Run initialization Heap snapshot

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profile guided optimization • GraalVM EEJIT native-image

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• # "!' & • Java# • # • • Java 14 $ %

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• OpenJDK • HotSpot JDK • GraalVM

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Micronaut • Micronaut • Micronaut main main ↓ System.out.println(ManagementFactory.getRuntimeMXBean().getUptime());

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OpenJDK • Java 8Java 13 • CDS • AOT • • Compact String •

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Java8Java13 • Java 13 0 200 400 600 800 1000 1200 1400 Java 8 Java 13 VM

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CDS • Java 12Default CDSCDS • 13 Default CDSJava 13 0 200 400 600 800 1000 1200 1400 Java 8 13 No CDS 13 Default CDS 13 Dynamic CDS 13 App CDS VM

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HotSpotJDK • OpenJ9JIT • GragonwellMac Linux JWarmup • Azul Zing ! 0 200 400 600 800 1000 1200 1400 Java 8 Java 13 13 App CDS OpenJ9 OpenJ9 JIT Cache VM

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GraalVM native image • native image 0 200 400 600 800 1000 1200 1400 Java 8 Java 13 13 App CDS native image VM

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native image • 0 5 10 15 20 25 30 35 40 45 Java 8 Java 13 CE JIT EE JIT CE AOT EE AOT

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profile guided optimization • 0 5 10 15 20 25 30 35 40 45 Java 8 Java 13 CE JIT EE JIT CE AOT EE AOT PGO

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• App CDS • native-image 0 50 100 150 200 250 300 350 Java 8 Java 13 13 App CDS OpenJ9 JIT Cache GraalVM JIT GraalVM AOT

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• # "!' & • Java# • # • • Java 14 $ %

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Java 14 • static final • GraalVM JIT • JWarmup

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static final • https://openjdk.java.net/jeps/8209964 • ↓ • private final static Logger LOGGER = Logger.getLogger("com.foo.Bar");

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Graal JIT • https://openjdk.java.net/jeps/8223220 • OpenJDK Graal JIT Java JIT#% • " • native-image shared library!$ 0 500 1000 1500 2000 Java 8 Java 13 13 + Graal VM" " 0 50 100 150 200 Java 8 Java 13 13 + Graal

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JWarmup • https://openjdk.java.net/jeps/8203832 • GragonwellJWarmupOpenJDK