Converting JFR Method Profiling Samples to FlameGraph compatible format.

This is a simple application to read Method Profiling Samples from Java Flight Recorder dump and convert those Stack Traces to [FlameGraph] compatible format. [FlameGraph]: https://github.com/brendangregg/FlameGraph

This application uses the unsupported [JMC Parser]. [JMC Parser]: http://hirt.se/blog/?p=446

See my blog post on "Flame Graphs with Java Flight Recordings" for more details.

How to build

Step 1:

Run install-mc-jars.sh script.

The required JMC dependencies need to be installed to a local repository first. The script will install required JMC jars to the local repository (The repo directory) and output a file named jmc_version.properties, which will show you the version of Java Mission Control Dependencies used. This script should automatically update the <jmc.version> property in pom.xml. Please verify that the <jmc.version> value is equal to the version found in jmc_version.properties.

Step 2:

Run mvn clean install -U.

How to run

After building, you can just run the JAR file. There is a helper script named flamegraph-output.sh to run the jar file.

For example:

./flamegraph-output.sh folded -f /tmp/highcpu.jfr -o /tmp/output.txt

Following are the options available.

$ ./flamegraph-output.sh -h
Usage: Application [options] [command] [command options]
  Options:
    -h, --help
      Display Help
      Default: false
  Commands:
    folded      Create folded output
      Usage: folded [options]
        Options:
          -d, --decompress
            Decompress the JFR file
            Default: false
          -i, --ignore-line-numbers
            Ignore Line Numbers in Stack Frame
            Default: false
        * -f, --jfrdump
            Java Flight Recorder Dump
          -o, --output
            Output file

    json      Create json output for d3-flame-graph
      Usage: json [options]
        Options:
          -d, --decompress
            Decompress the JFR file
            Default: false
          -i, --ignore-line-numbers
            Ignore Line Numbers in Stack Frame
            Default: false
        * -f, --jfrdump
            Java Flight Recorder Dump
          -l, --live
            Export stack trace sample timestamp
            Default: false
          -o, --output
            Output file

How to generate a Flame Graph

Clone Brendan's [FlameGraph] repository, generate FlameGraph using flamegraph.pl and open the SVG file in your web browser.

git clone https://github.com/brendangregg/FlameGraph.git
cd FlameGraph
cat /tmp/output.txt | ./flamegraph.pl > ../traces-highcpu.svg
firefox ../traces-highcpu.svg

License

Copyright (C) 2015 M. Isuru Tharanga Chrishantha Perera

Licensed under the Apache License, Version 2.0