Javaの起動時間といかに戦うか / How to fight against Java warmup time

2019/11/23に開催されたJJUG CCC 2019 Fallでの登壇資料です

Transcript

1. Java 
     2019/11/23 JJUG CCC 2019 Fall LINE Fukoka  
2. 
   •  
    • LINE Fukuoka • @kis • Hatena (nowokay.hatenablog.com)
3. 
    • # "!' & • Java # • # 
    • 
    • Java 14 $   %
4. 
    • # "!' & • Java # • # 
    • 
    • Java 14 $   %
5.  
      • $'#  :8" @) 74 . • /6$'#  "&  2 • ,> ;(*8  • "0B< • % ! 15
   ?+  • -=9<3A
6. 
    • # "!' & • Java # • # 
    • 
    • Java 14 $   %
7. Java
    • JVM •   •  •   
      (JIT) Java Bytecode loading class interpret profile generate native code internal expression profile data native code Execute on CPU
8. 
    • # "!' & • Java # • # 
    • 
    • Java 14 $   %
9.  
    •  
     • JIT    • JIT  •
    
10.  
     •      or  
      •  • OpenJDK CDS(Class Data Sharing) Java Bytecode loading class interpret profile generate native code internal expression profile data native code Execute on CPU !
11. 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
    #"
12. JIT   
     •  
     JVM •  • Alibaba Dragonwell - JWarmup Java Bytecode loading class interpret profile generate native code internal expression profile data native code Execute on CPU 
13. 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 
14. 
    
    JIT • JITJIT    
    • OpenJ9 • JIT as a Service(JITaaS) • https://www.youtube.com/watch?v=gx8DVVFPkcQ
15. 
       • 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
16. JIT
    AOT JIT AOT 
      $     
    #! "  
    
      CPU &%'
17. 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
18. profile guided optimization • GraalVM EEJIT 
    native-image
19. 
     • # "!' & • Java # • # 
     • 
     • Java 14 $   %
20. 
     • OpenJDK • HotSpot JDK  • GraalVM 
    
21. 
    Micronaut • Micronaut   • Micronaut main    
    main    ↓ System.out.println(ManagementFactory.getRuntimeMXBean().getUptime());
22. OpenJDK  
     • Java 8 Java 13 • CDS • AOT •    • Compact String 
    •    
23. Java8
    Java13 • Java 13 
    
    0 200 400 600 800 1000 1200 1400 Java 8 Java 13 VM   
24. 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 
25. 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 
26. GraalVM native image • native image
    0 200 400 600 800 1000 1200 1400 Java 8 Java 13 13 App CDS native image VM 
27. native image
      • 
     0 5 10 15 20 25 30 35 40 45 Java 8 Java 13 CE JIT EE JIT CE AOT EE AOT 
28. 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 
29. 
     • 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 
30. 
     • # "!' & • Java # • # 
     • 
     • Java 14 $   %
31. Java 14  
    • static final 
     • GraalVM JIT   • JWarmup
32. static final 
        • https://openjdk.java.net/jeps/8209964 • 
    ↓ •       private final static Logger LOGGER = Logger.getLogger("com.foo.Bar");
33. 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 
34. JWarmup • https://openjdk.java.net/jeps/8203832 • GragonwellJWarmupOpenJDK