Flame Graph Reader

Flame Graph Reader - is an interactive, in-browser flame graph visualization tool inspired by the original creator of flame graphs: Brendan D. Gregg. At this moment Flame Graph Reader has the following features:

• Regex based annotations.
• Comparing flame graphs using diff view
• Marking frames as good, bad, suspicious
• Edit frames names
• Save/load flame graphs

Online app

Flame Graph Reader is available online here: https://ishubin.github.io/flame-graph-reader/. It is a static website and it does not store anything on the server. There is no upload and all report processing happens on the client side only.

Supported formats

Flame Graph Reader only supports limited formats:

Folded log

The folded log is text based log where each line represents a stacktrace with a number of observed samples. The frames in the stacktrace are delimited with ; symbol. This log can be generated using the scripts from https://github.com/brendangregg/FlameGraph repo

Example:

com.example.Main.main;com.example.Main.read 2
com.example.Main.main;com.example.Main.loadFile 1

Java Flight Recorder JSON format

There is a way to convert Java Flight Recorder reports to JSON with the help of these tools: https://github.com/aragozin/jvm-tools. Once you obtain the Java Flight Recorder report (e.g. recording.jfr) you can convert it to json with the following command

java -jar sjk-plus-0.15.jar jfr2json -i recording.jfr -o recording.json

After that you can just load the generated recording.json in the Flame Graph Reader.

Custom Flame Graph Reader format

This is a JSON based format which Flame Graph Reader uses for saving flame graphs with marks and annotations.

License

This Source Code is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.