Java Colombo Meetup: Java Mission Control & Java Flight Recorder
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Presentation slides used at the 17th Java Colombo Meetup. http://www.meetup.com/java-colombo/events/218658123/ This presentation explains the JMX Console & Java Flight Recorder (JFR) tools in Java Mission Control (JMC)
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Java Colombo Meetup: Java Mission Control & Java Flight Recorder
- 1. Java Mission Control & Java Flight Recorder M. ISURU T. C. PERERA 1 @chrishantha
- 2. Agenda Tools in Java Development Kit What is Java Mission Control (JMC) Java Flight Recorder (JFR) Demos 04/12/2014Java Colombo Meetup 2
- 3. JDK Tools • Basic Tools (java, javac, jar) • Security Tools (jarsigner, keytool) • Java Web Service Tools (wsimport, wsgen) • Java Troubleshooting, Profiling, Monitoring and Management Tools (jcmd, jconsole, jmc, jvisualvm) 04/12/2014Java Colombo Meetup 3 Image Source: http://commons.wikimedia.org/wiki/File:Hand_tools.jpg
- 4. Java Troubleshooting, Profiling, Monitoring and Management Tools jcmd - JVM Diagnostic Commands tool jconsole - A JMX-compliant graphical tool for monitoring a Java application jvisualvm – Provides detailed information about the Java application. It provides CPU & Memory profiling, heap dump analysis, memory leak detection etc. jmc – Tools to monitor and manage Java applications without introducing performance overhead 04/12/2014Java Colombo Meetup 4
- 5. Java Experimental Tools Monitoring Tools jps – JVM Process Status Tool jstat – JVM Statistics Monitoring Tool Troubleshooting Tools jmap - Memory Map for Java jhat - Heap Dump Browser jstack – Stack Trace for Java 04/12/2014Java Colombo Meetup 5
- 6. What is Java Mission Control? A set of powerful tools running on the Oracle JDK to monitor and manage Java applications Free for development use (Oracle Binary Code License) Available in JDK since Java 7 update 40 Supports Plugins Two main tools JMX Console Java Flight Recorder 04/12/2014Java Colombo Meetup 6
- 7. Starting Java Mission Control Run “jmc” command in $JAVA_HOME/bin It runs on Eclipse It can also be installed on your existing Eclipse 04/12/2014Java Colombo Meetup 7
- 8. Troubleshooting Tip If “jmc” crashes with SIGSEGV on Ubuntu, try following sudo -E sh -c 'echo org.eclipse.swt.browser.DefaultType=mozilla >> $JAVA_HOME/lib/missioncontrol/configuration/config.ini' 04/12/2014Java Colombo Meetup 8
- 9. Java Process Browser Uses the Java Discovery Protocol (JDP). Allows to list and connect to both locally and remotely running Java applications. JMC provides full secure access with encrypted communication and configurable user access restrictions. 04/12/2014Java Colombo Meetup 9
- 10. JMX Console A tool for monitoring and managing multiple Oracle JDK instances via JMX interface Captures and presents live data about: Garbage Collection (GC) Pauses Memory (Heap Usage) CPU Usage Other attributes exposes via MBeans Provides triggers that can monitor MBeans and trigger an action 04/12/2014Java Colombo Meetup 10
- 11. JMX Console 04/12/2014Java Colombo Meetup 11
- 12. JMX Console Tabs Overview – Dashboard, Graphs with real-time usage statistics System – Information about the JVM Memory – Monitor heap usage, garbage collection & active memory pools Threads – Live thread usage by the application MBean Browser – Access all registered MBeans Triggers – Manage rules that trigger events Diagnostic Commands – Execute commands on JVM 04/12/2014Java Colombo Meetup 12
- 13. JMX Console Demo Sample applications from Marcus Hirt’s Tutorials (http://hirt.se/blog/?p=611) Demonstrating CPU Usage viewing in JMC View deadlocked threads 04/12/2014Java Colombo Meetup 13 Image Source: https://duke.kenai.com/boxer/boxer.gif
- 14. Flight Recorder “Black box” used in aircraft 04/12/2014Java Colombo Meetup 14 Image Source: http://commons.wikimedia.org/wiki/File:Black_box.aeroplane.JPG
- 15. Java Flight Recorder A profiling and event collection framework built into the Oracle JDK Gather low level information about the JVM and application are behaving without performance impact (less than 2%) Always on Profiling in Production Environments Engine was released with Java 7 update 4 04/12/2014Java Colombo Meetup 15
- 16. Data Collection JFR stores data in a hierarchy of in-memory buffers. The data is moved to the disk when the buffers are full Initially the JFR stores data in thread-local buffers. (Improves throughput, no synchronization for every event) Once the thread-local buffer has been filled, the data is transferred to a global buffer. (Requires synchronization) After the buffers are full, the data is written to the disk 04/12/2014Java Colombo Meetup 16
- 17. Data Analysis JFR Plugin in JMC provides dynamic and in-depth analysis of all collected JFR data. JFR enables users to analyze all aspects of a Java application Can analyze the Code, Memory, Threads, Locks and I/O 04/12/2014Java Colombo Meetup 17
- 18. Type of Events in JFR Instant events – Events with only one time Requestable events – Events with a user configurable period Duration events – Event with a start and end time Timed events – Duration events with a user configurable threshold 04/12/2014Java Colombo Meetup 18
- 19. JFR Recoding Types Time Fixed Recordings Fixed duration The recording will be opened automatically in JMC at the end(If the recording was started by JMC) Continuous Recordings No end time Must be explicitly dumped 04/12/2014Java Colombo Meetup 19
- 20. Enabling Java Flight Recorder The server VM needs to be started with following options -XX:+UnlockCommercialFeatures -XX:+FlightRecorder Make sure to use JDK 7u40 or later For remote monitoring, start with appropriate com.sun.management flags 04/12/2014Java Colombo Meetup 20
- 21. Flight Recording from JMC Right click on JVM and select “Start Flight Recording” Select the type of recording: Time fixed / Continuous Select the flight recording template Modify the event options for the selected flight recording template (Optional) Modify the event details (Optional) 04/12/2014Java Colombo Meetup 21
- 22. Start Flight Recording Wizard 04/12/2014Java Colombo Meetup 22
- 23. Event Options for Profiling 04/12/2014Java Colombo Meetup 23
- 24. Event Details for Profiling 04/12/2014Java Colombo Meetup 24
- 25. Flight Recording using startup flags To produce a Flight Recording from the command line, you can use “- XX:StartFlightRecording” option. For example - XX:StartFlightRecording=delay=20s,duration=60s,name=Test,filename=recording. jfr,settings=profile Setting are in $JAVA_HOME/jre/lib/jfr Use following to change log level -XX:FlightRecorderOptions=loglevel=info 04/12/2014Java Colombo Meetup 25
- 26. The Default Recording Use default recording option to start a continuous recording -XX:FlightRecorderOptions=defaultrecording=true Default recording can be dumped on exit Only the default recording can be used with the dumponexit and dumponexitpath parameters - XX:FlightRecorderOptions=defaultrecording=true,dumponexit=true,dumponexit path=/tmp/dumponexit.jfr 04/12/2014Java Colombo Meetup 26
- 27. Creating Recording with “jcmd” command The command “jcmd” can also be used to start flight recording Start Recording Example: jcmd <pid> JFR.start delay=20s duration=60s name=MyRecording filename=/tmp/recording.jfr settings=profile Check recording jcmd <pid> JFR.check Dump Recording jcmd <pid> JFR.dump filename=/tmp/dump.jfr name=MyRecording 04/12/2014Java Colombo Meetup 27
- 28. Analyzing Flight Recordings JFR runtime engine dumps recorded data to files with *.jfr extension These binary files can be viewed from JMC client There are tab groups showing certain aspects of the JVM and the Java application runtime such as Memory, Threads, I/O etc. 04/12/2014Java Colombo Meetup 28
- 29. Analyzing Flight Recordings 04/12/2014Java Colombo Meetup 29
- 30. JFR Tab Groups General – Details of the JVM, the system, and the recording. Memory - Information about memory & garbage collection. Code - Information about methods, exceptions, compilations, and class loading. Threads - Information about threads and locks. I/O: Information about file and socket I/O. System: Information about environment Events: Information about the event types in the recording 04/12/2014Java Colombo Meetup 30
- 31. Operative Set A global set of events Events can be added or removed from the context menu A check box is used to show events in the operative set 04/12/2014Java Colombo Meetup 31
- 32. Flight Recording Demo Time fixed & continuous recordings Analyzing 04/12/2014Java Colombo Meetup 32 Image Source: https://duke.kenai.com/gun/Gun.jpg
- 33. References Java Mission Control Marcus Hirt’s Blog Advanced Java Diagnostics and Monitoring Without Performance Overhead - Oracle Whitepaper Oracle Java SE Advanced InfoQ - Mission Control and Flight Recorder on HotSpot JVM JMC & JFR - Diagnostic Tools JDK Development Tools Java Mission Control and Flight Recorder Demo Series 04/12/2014Java Colombo Meetup 33
- 34. Thank you! 04/12/2014Java Colombo Meetup 34 Image Source: https://duke.kenai.com/animations/DukeTuxChristmas.gif