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
   

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2. 
   •
   • LINE Fukuoka
   • @kis
   • Hatena (nowokay.hatenablog.com)
   

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3. 
   • # "!' &
   • Java#
   • #
   •
   • Java 14 $
   %
   

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4. 
   • # "!' &
   • Java#
   • #
   •
   • Java 14 $
   %
   

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5. 
   
   • $'#
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   • /6$'#
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   • ,>
   ;(*8
   • "0B<
   • % !15
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   • -=9<3A
   

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6. 
   • # "!' &
   • Java#
   • #
   •
   • Java 14 $
   %
   

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7. 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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8. 
   • # "!' &
   • Java#
   • #
   •
   • Java 14 $
   %
   

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9. 
   
   •
   
   • JIT
   • JIT
   •
   
   

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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
    !
    

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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#"
    

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12. 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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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
    
    

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

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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
    

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16. JITAOT
    JIT AOT
    
    $
    
    
    #!
    "
    
    
    CPU &%'
    

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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
    

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18. profile guided optimization
    • GraalVM EEJIT
    
    native-image
    

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19. 
    • # "!' &
    • Java#
    • #
    •
    • Java 14 $
    %
    

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20. 
    • OpenJDK
    
    • HotSpot JDK
    
    • GraalVM
    

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

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

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

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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
    
    

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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
    

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26. 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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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
    
    

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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
    
    

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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
    
    

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30. 
    • # "!' &
    • Java#
    • #
    •
    • Java 14 $
    %
    

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31. Java 14
    
    
    • static final
    • GraalVM JIT
    
    • JWarmup
    

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

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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
    
    

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

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