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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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• # "!'
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• Java #
• #
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• Java 14 $
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• # "!'
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• Java 14 $
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• # "!'
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Java
• JVM
•
•
•
(JIT)
Java
Bytecode
loading
class
interpret profile
generate
native code
internal
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profile
data
native
code
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• # "!'
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• #
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•
• JIT
• JIT
•
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•
or
•
• OpenJDK CDS(Class Data Sharing)
Java
Bytecode
loading
class
interpret profile
generate
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internal
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profile
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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
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•
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• 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
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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 8 Java 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 !$
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500
1000
1500
2000
Java 8 Java 13 13 + Graal
VM" "
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50
100
150
200
Java 8 Java 13 13 + Graal
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JWarmup
• https://openjdk.java.net/jeps/8203832
• GragonwellJWarmupOpenJDK