node.js memory leak

how to detect.rst

How to detect node.js Memory Leak

1. Install node-webkit-agent

   $ npm install node-webkit-agent

2. Modify script

   Add following lines in the script:

   var agent = require('webkit-devtools-agent');

3. Run server.

4. Send signal to server

   $ kill -USR2 35490   # for OSX, other POSIX systems use SIGUSR2

5. Open This page by Chrome.
6. Take heap snapshot
7. Run load test script
8. Take heap snapshot again.
9. Compare these snapshots.

leak.js

// leaked!

var logger = require('logger');
var someService = require('someService');

SomeClass = BaseClass.extends({
    initialize: function () {
        // This initialize function (closure) is leaked.
        someService.on('error', function (msg) {
            logger.error(msg);
        });
    }
}):

// fix!

var logger = require('logger');
var someService = require('someService');

function reportError(msg) {
    logger.error(message);
}

SomeClass = BaseClass.extends({
    initialize: function () {
        someService.on('error', reportError);
    }
}):