cpuprofile2stackcollapse

cpuprofile2stackcollapse

This tool converts cpuprofile data, as generated by v8-profiler or by Chrome DevTools, into collapsed stack samples consumable by Brendan Gregg's FlameGraph tool.

This has been tested to work with Node v4.x and Node 6.x, and the cpuprofile data generated by the builtin profilers in each.

Note: This tool does not process data produced by node --prof. Yet.

Usage

Pipe cpuprofile data to it, and get collapsed stack samples on stdout.

Example:

# assuming you've generated a cpuprofile file as named here
# and that you have FlameGraph cloned at ~/FlameGraph

cat myapplication.cpuprofile | cpuprofile2stackcollapse | ~/FlameGraph/flamegraph.pl > myapplication.svg

You can also use it programattically, as a transform stream:

const convert = require('cpuprofile2stackcollapse');
const fs = require('fs');

fs.createReadStream('./myapplication.cpuprofile')
  .pipe(convert())
  .pipe(fs.createWriteStream('./myapplication.stacks'));

You can use this to create stacks before and after a change, and use the difffolded.pl tool to make a comparison flamegraph.

cat myapp-before-change.cpuprofile | cpuprofile2stackcollapse > myapp-before-change.stacks
cat myapp-after-change.cpuprofile | cpuprofile2stackcollapse > myapp-after-change.stacks
~/FlameGraph/difffolded.pl myapp-before-change.stacks myapp-after-change.stacks | ~/FlameGraph/flamegraph.pl > myapp-diff.svg

License

MIT License. See LICENSE.txt