CopenhagenJS conference: [Debugging Node.js Performance Issues in Production](https://opbeat.com/community/posts/debugging-node-js-performance-issues-in-production-by-thomas-watson/)
Stacktrace on running process (CPU): `perf record` to record CPU processes (tell node to dump perf meta data with `node --perf_basic_prof_only_functions app.js`) outputs file in `/temp/perf-1011.map` and `./perf.data`. Parse data into file `perf script > stack.out`. Install `npm i -g 0x` and the you can generate a chart flame with the parsed data by `0x -c gen stack.out > flame.html`.