A Glance At The Java Performance Toolbox.pdf
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The document discusses various tools for optimizing Java applications in containers, including JLink for creating modular runtime images, Jcmd and Jstat for monitoring memory and garbage collection, JFR for capturing performance events, and techniques for customizing the JVM and recording custom JFR events. It provides an overview of these tools and examples of using them to build efficient container images, monitor applications, and troubleshoot performance issues.
A Glance At The Java Performance Toolbox.pdf
- 1. A Glance at The Java Performance Toolbox
- 2. Java Champion Alumni, Certified Architect Senior Developer Advocate at Oracle Passionate about solving complex scenarios involving Java and Kubernetes. ammbra1508 ammbra1508.mastondon.social
- 3. Using the JDK Tools for Containerized Applications
- 6. Tools to build an OCI Compliant Image • Docker build • Buildpacks • Jib • kaniko • buildah • s2i • And many more J
- 7. The Good Old Dockerfile
- 8. The Good Old Dockerfile Use a small base image
- 9. The Good Old Dockerfile Use a small base image Create images with common layers
- 10. The Good Old Dockerfile Use a small base image Install only what is strictly needed Create images with common layers
- 11. Creating Custom Java Runtimes for Container Images
- 12. Jlink JEP 282 “Link time is an opportunity to do whole-world optimizations that are otherwise difficult at compile time or costly at run-time” jlink: Command Line Tool to Link Modules • Modules in a jimage file • Generate runtime images
- 13. Jlink Packaging Legacy JDK image JDK > 9 generated image bin jre lib bin conf …….. Modular runtime image jlink
- 14. Maintain The Good Old Dockerfile with JLink The runtime stage build • From a JDK base image • Create your own custom JRE with jlink
- 15. Maintain The Good Old Dockerfile with JLink The runtime stage build • From a JDK base image • Create your own custom JRE with jlink The application stage build • From an OS base image • Copy the custom JRE from the runtime stage build • Copy the artifacts needed by your application • Run the application
- 16. The Runtime Stage Build
- 17. The Runtime Stage Build
- 18. The Runtime Stage Build jdeps --ignore-missing-deps -q -recursive --multi-release 20 --print-module-deps --class-path 'target/libs/*’ target/spring-todo-app.jar
- 19. The Runtime Stage Build
- 20. The Runtime Stage Build Strips debug information from the output image
- 21. The Runtime Stage Build
- 22. The Runtime Stage Build Exclude man pages and header files
- 23. The Runtime Stage Build z
- 24. The Runtime Stage Build Enable compression of resources: 0: No compression 1: Constant string sharing 2: ZIP
- 25. The Application Stage Build Copy the custom JRE
- 26. The Application Stage Build Copy the artifacts needed by your application
- 27. The Application Stage Build Run the application
- 28. Fine Tuning JVM Flags
- 29. Tracking Native Memory With Jcmd
- 30. Tracking Native Memory With Jcmd Add jdk.jcmd module
- 31. Tracking Native Memory With Jcmd WARNING: Overusing jcmd to send diagnostic commands can affect the performance of the VM.
- 32. Tracking Native Memory With Jcmd WARNING: Overusing jcmd to send diagnostic commands can affect the performance of the VM. Add -XX:NativeMemoryTracking={off|summary|detail} to JDK_JAVA_OPTIONS • kubectl set env deployment/app JDK_JAVA_OPTIONS=“-XX:NativeMemoryTracking=summary” • Please consider that having NMT enabled can add application performance overhead.
- 33. Tracking Native Memory With Jcmd WARNING: Overusing jcmd to send diagnostic commands can affect the performance of the VM. Add -XX:NativeMemoryTracking={off|summary|detail} to JDK_JAVA_OPTIONS Create a native memory baseline kubectl exec pod_name –it --/bin/bash -c "jcmd llvmid VM.native_memory baseline"
- 34. Tracking Native Memory With Jcmd WARNING: Overusing jcmd to send diagnostic commands can affect the performance of the VM. Add -XX:NativeMemoryTracking={off|summary|detail} to JDK_JAVA_OPTIONS Create a native memory baseline kubectl exec pod_name –it --/bin/bash -c "jcmd llvmid VM.native_memory baseline" Create a native memory summary diff kubectl exec pod_name –it --/bin/bash -c "jcmd llvmid VM.native_memory summary.diff"
- 35. Enabling JMX Monitoring and Remote Access to a Remote Host
- 36. Get Statistics About Running Java Processes
- 37. Obtain Statistics with Jstat and Jmap Obtain statistics about garbage collectors by running jstat kubectl exec pod_name –it --/bin/bash -c "jstat -gcutil llvmid 500 50"
- 38. Obtain Statistics with Jstat and Jmap Obtain statistics about garbage collectors by running jstat kubectl exec pod_name –it --/bin/bash -c "jstat -gcutil llvmid 500 50" Print heap summaries kubectl exec pod_name –it --/bin/bash -c "jmap -histo llvmid"
- 39. Capture Performance Relevant JVM And Application Events
- 40. Add JFR To Your Container Image
- 41. Enable JFR Enable JFR in JDK_JAVA_OPTIONS kubectl set env deployment/app JDK_JAVA_OPTIONS=“--XX:StartFlightRecording:..” Use the diagnostic command: kubectl exec pod_name –it --/bin/bash -c "jcmd 1 JFR.start…"
- 42. Start JFR Enable JFR in JDK_JAVA_OPTIONS kubectl set env deployment/app JDK_JAVA_OPTIONS=“--XX:StartFlightRecording:..” Start a Time Fixed Recording with profile settings -XX:StartFlightRecording=delay=10s,duration=10m,name=Profiling,settings=profile
- 43. Start JFR Enable JFR in JDK_JAVA_OPTIONS kubectl set env deployment/app JDK_JAVA_OPTIONS=“--XX:StartFlightRecording:..” Start a Time Fixed Recording with profile settings -XX:StartFlightRecording=delay=10s,duration=10m,name=Profiling,settings=profile Start a Time Fixed Recording with default settings -XX:StartFlightRecording=delay=10s,duration=10m,name=Default,settings=default
- 44. Start JFR Enable JFR in JDK_JAVA_OPTIONS kubectl set env deployment/app JDK_JAVA_OPTIONS=“--XX:StartFlightRecording:..” Start a Time Fixed Recording with profile settings -XX:StartFlightRecording=delay=10s,duration=10m,name=Profiling,settings=profile Start a Time Fixed Recording with default settings -XX:StartFlightRecording=delay=10s,duration=10m,name=Default,settings=default Start a Continous Recording -XX:StartFlightRecording:filename=/recordings/recording.jfr,settings=profile
- 45. Where to Use JFR Streaming Streaming selected metrics to your monitoring service Send an average, min, max, etc of a metric Expose JFR data through other management APIs
- 46. Where NOT to Use JFR Streaming “To consume the data today, a user must start a recording, stop it, dump the contents to disk and then parse the recording file. This works well for application profiling, where typically at least a minute of data is being recorded at a time, but not for monitoring purposes.“ source: JEP 349
- 47. Make your settings by extending jdk.jfr.SettingControl Recording Custom JFR Events
- 48. Make your settings by extending jdk.jfr.SettingControl Create your custom event by extending jdk.jfr.Event Recording Custom JFR Events
- 49. Recording Custom JFR Events Make your settings by extending jdk.jfr.SettingControl Create your custom event by extending jdk.jfr.Event Register the custom settings in your custom event via @jdk.jfr.SettingsDefinition
- 50. Recording Custom Events in Spring Boot (example) Capture the custom JFR events in a dedicated filter and register it
- 51. Recording Custom Events in Spring Boot (example) Listen the custom JFR events and record their duration
- 53. Useful Links • Article https://www.javaadvent.com/2022/12/a-sneak-peek-at-the-java-performance-toolbox.html • Tools https://docs.oracle.com/en/java/javase/20/docs/specs/man/index.html • jlink https://dev.java/learn/jlink/ • Troubleshoot Memory Leaks: https://docs.oracle.com/en/java/javase/20/troubleshoot/troubleshooting-memory- leaks.html • JFR Runtime guide : https://docs.oracle.com/javacomponents/jmc-5-4/jfr-runtime-guide/about.htm#JFRUH170 • Innovative JFR use by @gunnarmorling: https://www.morling.dev/blog/finding-java-thread-leaks-with-jdk-flight- recorder-and-bit-of-sql/ • @gunnarmorling article on custom JDK Flight Recorder Events • Great intro by @BillyKorando https://www.youtube.com/watch?v=K1ApBZGiT-Y • Stack walker episode by @BillyKorando: https://inside.java/2023/05/14/stackwalker-02/