How to get Java profiling dump for creating flame graphs on the mac?

Question

I\'d like to collect stacktraces from my Java app for creating CPU Flame Graphs for profiling.

This is very similar to this question: How to get complete stack dump from

Answer 1

I created 2 little shell scripts based on @cello's answer. They generate hot/cold flame graphs.

Get them from this Gist.

Usage:

ps ax | grep java # find the PID of your process
./profile.sh 20402 stacks.txt
./gen.sh stacks.txt

Alternatively, to measure application from startup (in this, case, my gradle build that also needed to be run in another directory and with some input stream) I used:

cd ../my-project; ./gradlew --no-daemon clean build < /dev/zero &; cd -; ./profile.sh $! stacks.txt
./gen.sh stacks.txt

Results:

In this example, I can clearly see that my application is I/O bound (notice blue bars on top).