pflames is a tool for generating
flamegraphs from various profile
formats.
The following formats are supported (detected by file extension):
*.cpuprofile, as generated by older Chrome DevTools, v8-profiler, cli-profile, etc.perf.data, as generated byperf recordon Linux.isolate*.log, as generated bynode --prof.
The data is processed from these formats into flamegraphs generated by Brendan Gregg's FlameGraph tool, saved to a local file based on the input filename, then immediately opened in your web browser.
Examples:
$ npm i -g cli-profile
$ cli-profile myscript.js
$ ls *.cpuprofile
profile1522910623600.cpuprofile
$ pflames profile1522910623600.cpuprofile
$ # Note: Ensure your script has `process.on('SIGINT', process.exit)`
$ node --prof myscript.js
$ ls *.log
isolate-0x2259700-v8.log
$ pflames isolate-0x2259700-v8.log
$ sudo perf record -i -g -F 99 -- node --perf-basic-prof myscript.js
$ pflames perf.data
You can also compare two profiles of the same format by passing them both in. A difference flamegraph will be generated:
$ pflames thing1.cpuprofile thing2.cpuprofile
You can also use the same data to generate an icicle graph, so you can get a better view of what's calling a heavy function:
$ pflames --icicle thing1.cpuprofile
MIT License. See LICENSE.txt