Access the V8 profiler from node.js - http://nodejs.org/
This module is deprecated. Its functionality has been subsumed by the built-in profiler.
This module is for people who need fine-grained run-time control over the V8
profiler. You don't need it if all you want is wholesale profiling, simply
start node
with profiling enabled:
node --prof application.js
Read on, however, if you want to wield the arcane powers this module grants.
Easy as pie. To build from source:
node-gyp configure build install
Or, if you have npm
installed:
npm install profiler
In most cases you will want to start your application with the profiler in suspended animation.
node --prof --prof_lazy --log application.js
And inside your application:
var profiler = require('profiler');
//
// <here be code you don't want to profile>
//
profiler.resume();
//
// <performance critical code here>
//
profiler.pause();
This results in a v8.log being written to the current directory that you can
process with the bundled nprof
tool. Run sh tools/build-nprof
to build it.
You will sometimes want to run the garbage collector before profiling a performance critical section of code. Here is how you do it:
$ cat application.js
if (typeof gc === 'function') gc();
profiler.resume();
// ...
$ node --prof --prof_lazy --log --expose-gc application.js