This project has moved to AdoptOpenJDK/jitwatch to benefit the wider Java community.

All further development will take place on the AdoptOpenJDK fork.

JITWatch

Log analyser for the Java HotSpot JIT compiler.

For more information and screenshots see: http://www.chrisnewland.com/jitwatch

Processes a completed hotspot.log or tails a live one.

Easily view which methods are JIT-compiled and plot a timeline of JIT compilations.

Add source trees and jars/class folders to enable opening source / bytecode from a context menu.

To generate the log file used by JITWatch run your program with JVM switches

-XX:+UnlockDiagnosticVMOptions -XX:+TraceClassLoading -XX:+LogCompilation -XX:+PrintAssembly

If you want to use the -XX:+PrintAssembly switch to view the assembly language (disassembled JIT-compiled native code) then you need to use a debug JVM build or have built the hsdis (HotSpot disassembler) binary.

Instructions for building hsdis are here: http://dropzone.nfshost.com/hsdis.htm

Building JITWatch

Build with ant

ant clean
ant

If you get compile errors relating to external dependencies (JDK lib/tools.jar and jre/lib/jfxrt.jar) then set your JAVA_HOME environment variable to point to a JDK

export JAVA_HOME=/path/to/jdk
ant

Build with maven

mvn package

Running JITWatch

Run with launch scripts

#GUI Version
./launchUI.sh

#Simplifed Text Version
./launchHeadless.sh

If required, edit the launch scripts to set up your JDK_HOME variable by uncommenting and completing the line

#export JDK_HOME=

Run with ant

ant run

Run with maven

mvn exec:java