Socket.io chat server stress test

gistfile1.js

console.info("Socket.io chat test client");
io = require('socket.io-client');

for (var socket_n = 0; socket_n < 100; socket_n++) {

    (function() {

        var j = socket_n;

        socket = io.connect('http://mytestserver:3000', {'force new connection': true});
        socket.my_nick = process.pid.toString() + "_" + j.toString();

        (function() {
            var inner_socket = socket;
            inner_socket.on('connect', function () {
                console.info("Connected[" + j + "] => " + inner_socket.my_nick);

                inner_socket.emit('nickname', inner_socket.my_nick, function (set) { });

                var interval = Math.floor(Math.random()*10001) + 5000;
                setInterval(function() {
                    inner_socket.emit('user message', "Regular timer message every " + interval + " ms");
                }, interval);
            });
        })();

        socket.on('user message', function (from, msg) {
            //console.info(from + "::" + msg);
        });

        socket.socket.on('error', function (err_msg) {
            console.error("Connection Error:" + err_msg);
        });

        socket.on('nicknames', function (nicknames) {
            var number_of_users = 0;
            for (var i in nicknames) {
                number_of_users++;
            }
            console.info("There are " + number_of_users + " users logged in.");
        });

        socket.on('announcement', function (msg) {
            console.info("ANN: " + msg);
        });

        socket.on('disconnect', function () {
            console.info("Disconnected");
        });
    })();
}

Hi Cameron, any news on this?

I have the same issue... I've also created a simple chat application and a benchmark script, but it doesn't go over 20 or so clients...

If you want to see what I have done:

1. clone: https://github.com/michetti/holychat
2. install dependencies with 'npm install -d'
3. run app, 'node holychat.js'
4. run benchmark 'node benchmark.js 60 200 100 500 0 0'

'node benchmark ?' to see benchmark parameters...

I'm using node 0.4.12.

I'm trying to isolate the problem... for now, I will test to see if the problem is related to JSON parsing, since we are generating a lot of messages, and we are running all the clients on the same machine, so every client has to parse all the messages, from all other clients.