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AdoptOpenJDK/jitwatch

Log analyser / visualiser for Java HotSpot JIT compiler. Inspect inlining decisions, hot methods, bytecode, and assembly. View results in the JavaFX user interface.
Source code at GitHub https://github.com/AdoptOpenJDK/jitwatch
AdoptOpenJDK/jitwatch.json
{
  "createdAt": "2013-09-30T14:18:17Z",
  "defaultBranch": "master",
  "description": "Log analyser / visualiser for Java HotSpot JIT compiler. Inspect inlining decisions, hot methods, bytecode, and assembly. View results in the JavaFX user interface.",
  "fullName": "AdoptOpenJDK/jitwatch",
  "homepage": "",
  "language": "Java",
  "name": "jitwatch",
  "pushedAt": "2025-11-11T20:31:12Z",
  "stargazersCount": 3237,
  "topics": [
    "escape-analysis",
    "hotspot",
    "hotspot-jit-compiler",
    "java",
    "javafx",
    "jit-compiler",
    "jitwatch",
    "log-analyser"
  ],
  "updatedAt": "2025-11-22T18:55:20Z",
  "url": "https://github.com/AdoptOpenJDK/jitwatch"
}

JITWatch

Section titled “JITWatch”

Log analyser and visualiser for the HotSpot JIT compiler.

  • Video introduction to JITWatch video
  • Slides from my LJC lightning talk on JITWatch slides

For instructions and screenshots see the wiki

https://github.com/AdoptOpenJDK/jitwatch/wiki

The JITWatch user interface is built using JavaFX which is downloaded as a maven dependency for JDK11+.

For pre-JDK11 you will need to use a Java runtime that includes JavaFX.

maven

mvn clean package && java -jar ui/target/jitwatch-ui-shaded.jar

Build an example HotSpot log

# Build the code and then run
cd scripts && ./makeDemoLogFile.sh