kcpeppe/peakit

Java Performance Diagnostic Methodology

Exercise 0: Runtime Setup

Configuring setEnv

• Setting JAVA_HOME: After unpacking the zip, adjust the value of JAVA_HOME in the setEnv script.
  • For OSX: export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk-21.jdk/Contents/Home
  • For Windows Users: Escape spaces in paths. For example, use C:\\My\\ Documents.
  • Test the script by running ./setEnv.sh (setEnv.bat in Windows) which should display the version of Java you configured.

JVM Configuration

• The jvm.config file (or jvm.bat for Windows) contains JVM configurations including:
  • Choice of garbage collector
  • Size of heap
  • GC logging
  • Other configurations to support various types of investigations.

Download Tooling

• Tools:
  • VisualVM
  • Java Mission Control and Flight Recorder can also be used.
  • async profiler

Final Note

This workshop is designed to help you become more effective in resolving performance regressions. The exercises are open-ended, allowing for exploration of different performance aspects. If you encounter issues, do not hesitate to ask for help.

Warning

• Running some exercises may cause your CPUs to run at close to capacity, which could hinder the ability to terminate the application. Avoid running unnecessary applications.

Copyright Notice

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