Profiling Node.JS (code) execution time in Linux

Question

I am looking for a method to do precise Node.JS profiling of script execution times on Linux.

There are interesting projects like the NodeTime.com Performance Profiler, but this profiles the timing of I/O httprequests and such, not execution time of lines of code.

I am looking for a way to figure out exactly where I can optimize my Javascript, where most of the time is spent, etc.

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One interesting method I've seen is trying to create a FlameGraph using DTrace to profile Node.JS.

However, dtrace is very Solaris-specific.

• For Linux (Debian/Ubuntu), dtrace can be found in the sytemtap-sdt-dev package. However, stap dtrace is not the same, and lacks all relevant hooks/probes.
• Paul Fox made a port from the Unix version. It's more feature complete but somehow the hooks/probes don't work in userspace as the Solaris one, and also cannot be used to profile node.
  ftp://crisp.dyndns-server.com/pub/release/website/dtrace/ (It's pretty easy to build, see README.)
• There's also an Oracle port, but noone would recommend it. Apparently, it only has about 0,1 percent of the probes the Paul Fox port. (Which is ironic, because Oracle was formerly Sun, original authors of dtrace for Solaris)

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How, in Linux, using the terminal or using Eclipse, can I profile the code of my Node.JS scripts? I'm looking for something specific like the Zend Profiler shows execution times of each command in code of PHP scripts.

Answer 1

"look" is a very good tool made by Vadim for profiling NodeJS app.

Take a look here:

https://github.com/baryshev/look