chriswhocodes/jitwatch

Log analyser / visualiser for Java HotSpot JIT compiler. Inspect inlining decisions, hot methods, bytecode, and assembly. View results in the JavaFX user interface.

Java

3,313

1,053 commits

updated Sep 22, 2026

See the code

README

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/chriswhocodes/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

escape-analysis

hotspot

hotspot-jit-compiler

java

javafx

jit-compiler

jitwatch

log-analyser

Project health

Overall

4.1/10

Maintained

10/10

Code review

3/10

OpenSSF Scorecard

Significant stargazers

(top 24 of 76)

kenji yoshida

866 followers · starred Jun 2017

Benoit Daloze

492 followers · starred Sep 2016

Jie Fu (傅杰)

89 followers · starred Nov 2018

Tao He

462 followers · starred Jan 2019

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chriswhocodes/jitwatch

Log analyser / visualiser for Java HotSpot JIT compiler. Inspect inlining decisions, hot methods, bytecode, and assembly. View results in the JavaFX user interface.

Java

3,313

1,053 commits

updated Sep 22, 2026

See the code

README

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/chriswhocodes/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

escape-analysis

hotspot

hotspot-jit-compiler

java

javafx

jit-compiler

jitwatch

log-analyser

Project health

Overall

4.1/10

Maintained

10/10

Code review

3/10

OpenSSF Scorecard

Significant stargazers

(top 24 of 76)

kenji yoshida

866 followers · starred Jun 2017

Benoit Daloze

492 followers · starred Sep 2016

Jie Fu (傅杰)

89 followers · starred Nov 2018

Tao He

462 followers · starred Jan 2019

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