Node.js - core cluster module

Question

I am using the core cluster module in node v0.6.5. I have the following code:

var cluster = require('cluster');
var http = require('http');
var numWorkers = 3;

var count = 0;

if (cluster.isMaster) {
  for (var i = 0; i < numWorkers; i++) {
    cluster.fork();
  }
} else {
  console.log('createServer called');
  http.createServer(function (req, res) {
    count++;
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end('Count is: ' + count.toString());
  }).listen(1337, "127.0.0.1");
}

Everytime I hit the page, the count is incremented twice, e.g. 1,3,5,7... Why does it increment twice?

Dominic Barnes · Accepted Answer · 2012-01-18 04:36:47Z

5

This is probably another case where the browser is silently requesting /favicon.ico, thus making there 2 requests per page.

answered Jan 18, 2012 at 4:36

Dominic Barnes

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2 Comments

jeffreyveon Over a year ago

Gotcha. Another small doubt: the child workers share the global variables is it? Meaning - the child processes utilize the CPU cores right? But, they still have access to the global variable?

Dominic Barnes Over a year ago

That I'm not familiar with enough to help you on, I just knew about the browser's silent request there. Sorry :(

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