One file java script for visualizing JDK flight recorder execution logs as flamegraphs without any dependencies except Java and a browser.

Billy Sjöberg

Last update: Oct 2, 2022

Related tags

Profilers JavaFlames

Overview

Flamegraph from JFR logs

Simple one file Java script to generate flamegraphs from Java flight recordings without installing Perl and the Brendan Gregg scripts.

It also comes with a separate script to start profiling a java process using FlightRecorder and then call the flamegraph script.

Usage

With a fairly recent Java version installed simply run: java JavaFlames.java <path to jfr recording file>

This launches an http server serving the index.html file and endpoint for the folded format extracted from the JFR logs. The script then opens up a browser showing the results.

Alternatively if you don't have an existing JFR recording you can also start the Profile.java script to start profiling a java process generating the JFR file and then triggering flamegraph generation.

java Profile.java <pid> [<duration in seconds>]

The default profiling duration unless specified is 30 seconds.

Credits

Brendan Gregg for introducing the concept of flamegraphs and https://github.com/spiermar/d3-flame-graph for the javascript/html implementation.

Kotlin-decompiled - (Almost) every single language construct of the Kotlin programming language compiled to JVM bytecode and then decompiled to Java again for better readability

Kotlin: Decompiled (Almost) every single language construct of the Kotlin programming language compiled to JVM bytecode and then decompiled to Java ag

Dec 14, 2022

Comments

Contribute stack collapser back to Flamegraph repository

I've had a look at this repository and found it very useful, but decided I wanted the SVG instead of the HTML rendering and found that it was rather easy to adapt your code to create a Java stackcollapser from which ./flamegraph.pl in https://github.com/brendangregg/FlameGraph could be fed directly.

Would you be ok with me extracting this functionality and contributing it back to the FlameGraph repository? I think a single file Java program as you did it, fits the mindset rather well.

opened by ravn 0