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使ってみよう！JDK Flight Recorder
- 1. JDK Flight Recorder 2018 12 11 Duke An Oracle blog about Oracle Enterprise Pack for Eclipse Java 8 Launch!
- 2. … OpenJDK 11 JDK Flight Recorder Oracle JDK Java Flight Recorder 10 JRockit Hotspot VM JDK Flight Recorder
- 4. “ Flight Recorder” Java Java VM
- 5. “JDK Mission Control” JDK Flight Recorder Flight Recorder JDK Flight Recorder JFR File
- 6. Open Source Software Java 11 Flight Recorder OpenJDK Oracle JDK 11 “ ” -XX:+UnlockCommercialFeatures Java 11 Mission Control OpenJDK Project Oracle JDK 11 JDK Mission Control
- 7. Flight Recorder BEA JRockit 5.0 R26.0 (Flight Recorder) + JRockit Mission Control 1.0 Oracle JDK 7u40 (Flight Recorder) + Java Mission Control 5.2.0 Oracle JDK 8u20 (Flight Recorder) + Java Mission Control 5.4.0 Oracle JDK 8u40 (Flight Recorder) + Java Mission Control 5.5.0 Oracle JDK 9 (Flight Recorder) + Java Mission Control 6.0.0 OpenJDK 11 (Flight Recorder) / JDK Mission Control 7.0.0 (2019/1/30 ) 2005/12 2018/9 2013/9 2014/8 2015/3 2017/9
- 8. JDK Flight Recorder 1 2% Hotspot VM … Flight Recording Engine … … Recording JIT …
- 9. Flight Recording Engine Java API Events JavaVM / OS Events Repository (disk storage) Global Buffer -a -b Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer When full, is copied into Thread Buffer Event Event Event Event When full, is copied into JFR File When triggered, is dumped into
- 10. Java API Events Repository (disk storage) Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Thread Buffer Event Event Event Event JFR File JIT Compiler GC Exception / Error JavaVM / OS Events
- 11. JIT Java API Events Repository (disk storage) Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Thread Buffer Event Event Event Event JFR File The API for JFR JFR - OFF JFR - ON JavaVM / OS Events
- 12. 0 1 400 4 154 000 1 800 JFR disabled JFR enabled, stackdepth=1 log4j OFF log4j INFO j.u.logging OFF j.u.logging INFO Redirected System.out NANOS/OPERATION JMC, 8 THREADS Logging Benchmark 120 000 00043 000 000 Jfokus Developer Conference 2018 Mission Possible -Near Zero overhead profiling java.util.logging System.outJDK Flight Recorder Apache Log4j ON OFF ON OFF ON OFF
- 13. JDK Flight Recorder 1 2% Hotspot VM … Flight Recording Engine … … Recording JIT …
- 15. -XX:StartFlightRecording=param=value Java API Events Repository (disk storage) Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Thread Buffer Event Event Event Event JFR File disk={true|false} (true) dumponexit={true|false} (false) filename=path delay=time (0s : no delay) duration=time (0s : unlimited) maxage=time (0s : unlimited) maxsize=size (0m : unlimited) JavaVM / OS Events
- 16. -XX:StartFlightRecording=param=value Java API Events Repository (disk storage) Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Thread Buffer Event Event Event Event JFR File JavaVM / OS Events name=identifier (ex. 1, 2, …, n)
- 17. -XX:StartFlightRecording=param=value Java API Events Repository (disk storage) Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Thread Buffer Event Event Event Event JFR File JavaVM / OS Events path-to-gc-roots={true|false} (false) setting=path (default) JDK_HOME/lib/jfr default.jfc profile.jfc
- 20. default.jfc profile.jfc Old Promote New Allocate JIT Compile Failure 20ms 60s 1% → 2%
- 21. Configuration File JDK Mission Control 131
- 22. 131 JDK Flight Recorder Events
- 23. 131 Java Virtual Machine - - 2 JVM Infomations, System Properties Class Loading - 3 Class load, Class define, Class unload Code Cache - 3 Statistics, Configuration, Cache full Code Sweeper - 3 Configuration, Statistics, Code Cache Compiler - 5 Compilations, Phase, Configuration, Failure Optimization 1 Inlining Flag - 14 Int, long, unsigned int/long, double, boolean, String
- 24. 131 Java Virtual Machine GC Collector 5 Old, Young, ParallelOld, G1, Full GC Configuration 5 Heap, Young, Old, Survivor, TLAB Detailed 20 Allocation Requiring GC, G1 Regions, Z Statistics Heap 4 Heap usage Metaspace 4 GC Threshold, Allocation Failure, OOM, Chunk Free Phases 6 Pause Level, Concurrent Reference 1 Statistics
- 25. 131 Java Virtual Machine Profiling - 2 Thread State, Thread State in Native Runtime - 5 Shutdown, Thread Dump, VM Operations Modules 2 export, require Safepoint 6 begin,synchronize,cleanup, cleanup task, end, Java Application - - 21 Exception/Error, Allocation, Thread Start/end, I/O statistics - 5 Thread Allocation, Thread Exception, Class Loading Flight Recorder - - 4 Active recording/setting, Data loss, Dump Reason
- 26. 131 Operating System - - 3 Environment Variables OS Informations Memory - 1 Physical Memory Network - 1 Network Utilization Processor - 5 CPU Load, Context Switch rate
- 28. -XX:FlightRecorderOptions=param=value Java API Events Repository (disk storage) Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Thread Buffer Event Event Event Event JFR File JavaVM / OS Events maxchunksize=size (12m) allow_threadbuffers_to_disk={true|false} (false) repository=path (the system's temporary directory) threadbuffersize=size (8k)
- 29. -XX:FlightRecorderOptions=param=value Java API Events Repository (disk storage) Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Thread Buffer Event Event Event Event JFR File JavaVM / OS Events memorysize=size (10m) globalbuffersize=size numglobalbuffers=number
- 30. -XX:FlightRecorderOptions=param=value Java API Events Repository (disk storage) Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Global Buffer Thread Buffer Event Event Event Event JFR File JavaVM / OS Events retransform={true|false} (true) stackdepth=depth (64 : 64 ) samplethreads={true|false} (true) old-object-queue-size=number (256)11
- 31. Flight Recording
- 32. Java VM Flight Recording -XX:StartFlightRecording Java Application API for JFR jcmd JDK Mission Control JMX JVM Options jcmd <pid> JFR.start FlightRecorderMXBean#startRecording(id) Recording#start()
- 33. Java VM JDK Flight Recorder
- 34. Java VM java -XX:StartFlightRecording=settings=default, name=Sample,filename=c:¥myRecording.jfr -XX:FlightRecorderOptions=dumponexit=true Recording Java VM Started on Java VM start JFR File Dumped on exit (dumped into JFR File)
- 35. java -XX:StartFlightRecording=settings=profile,delay=20s,duration=60s, name=Sample,filename=c:¥myRecording.jfr Java VM Recording Started on demand Dumped on end JFR File (dumped into JFR File) delay duration
- 36. Java VM - jcmd JDK Flight Recorder
- 37. java -XX:StartFlightRecording=settings=default, name=Sample,filename=c:¥myRecording.jfr Java VM JFR FileStarted on Java VM start Dumped on demand Recording (dumped into JFR File) jcmd <pid> JFR.dumpjcmd
- 38. Java VM Recording Started on demand Dumped on end JFR File (dumped into JFR File) duration jcmd <pid> JFR.start settings=profile,duration=60s,name=Sample, filename=c:¥myRecording.jfr jcmd
- 39. JDK Mission Control JDK Flight Recorder
- 40. java -XX:StartFlightRecording=settings=default, name=Sample,filename=c:¥myRecording.jfr Java VM JFR FileStarted on Java VM start Dumped on demand Recording (dumped into JFR File) duration JDK Mission Control
- 41. Java VM Recording Started on demand Dumped on end JFR File (dumped into JFR File) JDK Mission Control duration settings
- 42. The API for JDK Flight Recorder JDK Flight Recorder
- 43. The API for JDK Flight Recorder jdk.management.jfr java.management java.base jdk.jfr Packages jdk.jfr jdk.jfr.consumer Packages jdk.management.jfr JMX
- 44. import jdk.jfr.*; import java.nio.file.*; public class MyRecording { public static void main(String... args) { try { Configuration config = Configuration.getConfiguration("profile"); Recording recording = new Recording(config); recording.enable("com.xxx.sample.MyEvent"); // @Name recording.start(); System.out.println(createMessage()); recording.stop(); Path filePath = FileSystems.getDefault().getPath(args[0]); recording.dump(filePath); settings JFR File JFR File
- 45. import jdk.jfr.consumer.*; import java.nio.file.*; public class MyReading { public static void main(String... args) { try { Path filePath = FileSystems.getDefault().getPath(args[0]); RecordingFile.readAllEvents(filePath).stream() .filter((RecordedEvent e) -> e.getEventType().getName().equals("MyEvent")) .map(e -> e.getValue("utilization")) .forEach(System.out::println); JFR File
- 46. Custom Event The API for JDK Flight Recorder
- 47. Custom Event import jdk.jfr.*; @Name("com.xxx.sample.MyEvent") @Label("My Custom Event") @Description("Helps programmer getting started") @Category({"Sample","My Event"}) public class MyEvent extends Event { @Label("Message") @Description(“Message that programmer should read") String message; JDK Mission Control
- 48. Content Type @Label("Utilization") @Percentage double utilization; // 0.0 1.0) @Label("Update") @Timestamp(Timestamp.MILLISECONDS_SINCE_EPOCH) long update; // @Label("FileSize") @DataAmount(DataAmount.BYTES) long fileSize; // } JDK Mission Control
- 49. Event Field Annotation @BooleanFlag Boolean true / false @DataAmount Byte @Frequency Hz @MemoryAddress @Percentage 0.0 1.0 @Timespan @Timestamp
- 50. Duration event MyEvent event = new MyEvent(); event.begin(); var stmt = dbConnection.createStatement( ); var rs = stmt.executeQuery("SELECT * FROM Message"); String msg = rs.getString("message"); event.end(); // event.message = msg; event.utilization = 0.3d; event.fileSize = 5000000; event.commit(); Event Flight Recorder
- 51. Periodic event FlightRecorder.addPeriodicEvent( MyEvent.class, ( ) -> { MyEvent event = new MyEvent( ); event.message = System.getProperty("hello.message"); event.commit( ); }); CPU GC etc… Event Flight Recorder Event
- 52. Configuration @Name("com.xxx.sample.MyEvent") @Label("My Custom Event") @Description("Helps programmer getting started") @Category({"Sample","My Event"}) public class MyEvent extends Event { @Enabled(true) @StackTrace(true) @Threshold("20 ms") @Period("10 s") Threshold Duration
- 53. Configuration File (ex. mySetting.jfc) <configuration> <event name="com.xxx.MyEvent"> <setting name="enabled">true</setting> <setting name="stackTrace">true</setting> <setting name="threshold">20 ms</setting> <setting name="periodic">10 s</setting> </event> </configuration> java -XX:StartFlightRecording:settings=mySetting.jfc
- 54. JDK Mission Control JDK Mission Control Tutorial
- 55. JMC 7.0 TutorialIndex This document describes a series of hands on exercises designed to familiarize you with some of the key concepts in JDK Mission Control. The material covers several hours’ worth of exercises, so some of the exercises have been marked as bonus exercises. Index ..............................................................................................................................1 Introduction....................................................................................................................3 Installing Mission Control .............................................................................................4 Starting JDK Mission Control .......................................................................................5 Exercise 1a – Starting the Stand-Alone Version of JMC ............................................... 5 Exercise 1b – Starting JMC in Eclipse ........................................................................... 7 The JDK Flight Recorder.............................................................................................14 Exercise 2a – Starting a JFR Recording ....................................................................... 14 Exercise 2b – Hot Methods........................................................................................... 20 Exercise 3 – Latencies .................................................................................................. 25 Exercise 4 (Bonus) – Garbage Collection Behavior..................................................... 29 Exercise 5 (Bonus) – Memory Leaks............................................................................ 31 Exercise 6 (Bonus) – WebLogic Server Integration..................................................... 33 Exercise 7 (Bonus) – JavaFX........................................................................................ 38 Exercise 8 (Bonus) – Exceptions.................................................................................. 39 Exercise 9 – Custom Events in JDK 9 (Bonus) ............................................................ 45 Exercise 10 – Custom Rules (Bonus) ........................................................................... 47 Running Rules......................................................................................................47 Creating Rules......................................................................................................48 Exporting the rule ................................................................................................55 Exercise 11 – Custom Pages......................................................................................... 56 Filters ...................................................................................................................56 Grouping ..............................................................................................................59 Boolean Filter Operations....................................................................................63 The Management Console (Bonus) .............................................................................67 Exercise 12a – The Overview....................................................................................... 67 Exercise 12b – The MBean Browser ............................................................................ 70 Exercise 12c – The Threads View ................................................................................ 73 GitHub repository: JDK Misson Control 7.0 Tutorial
- 61. JDK Flight Recorder 1 2% Hotspot VM … Flight Recording Engine … … Recording JIT …
- 62. … OpenJDK 11 JDK Flight Recorder Oracle JDK Java Flight Recorder 10 JRockit Hotspot VM JDK Flight Recorder
- 63. Appendix
- 64. JEP 328 : Flight Recorder https://openjdk.java.net/jeps/328 java Command - JDK 11 Tools and Commands Reference https://docs.oracle.com/en/java/javase/11/tools/java.html#GUID-3B1CE181-CD30-4178-9602-230B800D4FAE Oracle Code One 2018 Production-Time Profiling and Diagnostics on the JVM https://static.rainfocus.com/oracle/oow18/sess/1524413833476001nSDg/PF/ ProductionTimeProfiling_DEV4507_1540434986395001v92K.pdf Using Java Flight Recorder With OpenJDK 11 https://dzone.com/articles/using-java-flight-recorder-with-openjdk-11-1
- 65. Mission Control Project https://wiki.openjdk.java.net/display/jmc JMC 7 Early-Access Builds http://jdk.java.net/jmc/ JDK Mission Control Tutorial https://github.com/thegreystone/jmc-tutorial Jfokus Developer Conference 2018 Mission Possible - Near zero overhead profiling https://www.jfokus.se/jfokus18/preso/Mission-Possible--Near-zero-overhead-profiling.pdf
- 66. jdk.management.jfr.FlightRecorderMXBean https://docs.oracle.com/en/java/javase/11/docs/api/jdk.management.jfr/jdk/management/jfr/ FlightRecorderMXBean.html Package jdk.jfr https://docs.oracle.com/en/java/javase/11/docs/api/jdk.jfr/jdk/jfr/package-summary.html Package jdk.jfr.consumer https://docs.oracle.com/en/java/javase/11/docs/api/jdk.jfr/jdk/jfr/consumer/package-summary.html Java Flight Recorder 5.5 Runtime Guide ← Oracle JDK https://docs.oracle.com/javacomponents/jmc-5-5/jfr-runtime-guide/toc.htm
- 67. JDK Flight Recorder End Duke An Oracle blog about Oracle Enterprise Pack for Eclipse Java 8 Launch!