socket.io xhr-polling test.

ex.js

var i = 0, 
    io = require('socket.io'),
    http = require('http');

var server = http.createServer().listen(80);

io = io.listen(server);
io.set('transports', [ 'xhr-polling' ]);

io.sockets.on('connection', function(socket){
	i++;
	socket.log.info('Client ' + i + ' connected.');
});

ex.test.js

var io = require("socket.io-client")

var connectionInterval = 500;
var numberOfUsersToConnect = 100;
var connections = 0;
var connectionTimestampSum = 0;
var options = {
    transports: ['xhr-polling'],
    'force new connection': true
};

// UPDATE: This fixes the problem!
var http = require('http');
http.globalAgent.maxSockets = 100;
http.Agent.maxSockets = 100;

for (var i = 1; i <= numberOfUsersToConnect; i++) {
    (function (index) {
        
        setTimeout(function () {
                console.log(index + "/" + numberOfUsersToConnect + " tries to connect!");

                var time = Date.now(),
                    socket = io.connect("http://localhost", options)

    			socket.on('connect', function () {
                connections++;
    
                connectionTimestampSum += Date.now() - time;
                            
                console.log((connections) + "/" + numberOfUsersToConnect + " connected! (" + (Date.now() - time )+ "ms)");

                if (connections == numberOfUsersToConnect) {
                    console.log("Average connect time: " + Math.round(connectionTimestampSum / connections) + " ms!");
                    console.log("");
                }    
          });
        }, index * connectionInterval);
    })(i);
}

Related to socketio/socket.io#1145

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