tool for benchmark websocket (socket.io, faye)

npm install websocket-bench
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websocket bench

Nodejs cli tool for benchmarking websocket servers. Currently supports:

Build Status


npm install -g websocket-bench


Tip: You may find it useful to increase the maximum number of open file descriptors on your system during testing:

ulimit -n 60000

Simple example (using Socket.IO by default):

websocket-bench -a 2500 -c 200 http://localhost:3000

Simple example (using Primus):

websocket-bench -t primus ws://localhost:8080

command help

Usage: websocket-bench [options] <server>


  -h, --help               Output usage information
  -V, --version            Output the version number
  -a, --amount <n>         Total number of persistent connection, Default to 100
  -c, --concurency <n>     Concurent connection per second, Default to 20
  -w, --worker <n>         Number of worker(s)
  -g, --generator <file>   Js file for generate message or special event
  -m, --message <n>        Number of message for a client. Default to 0
  -o, --output <output>    Output file
  -t, --type <type>        Type of websocket server to bench(socket.io, faye, primus). Default to socket.io
  -p, --transport <type>   Type of transport to websocket(engine.io, websockets, browserchannel, sockjs, socket.io). Default to websockets (Just for Primus)
  -k, --keep-alive         Keep alive connection
  -v, --verbose            Verbose Logging

Benchmark message

For benchmark message or more advanced connection you should provide your own generator

generator structure :

(function() {

    * Before connection (optional, just for faye)
    * @param {client} client connection
   exports.beforeConnect = function(client) {
     // Example:
     // client.setHeader('Authorization', 'OAuth abcd-1234');
     // client.disable('websocket');

    * On client connection (required)
    * @param {client} client connection
    * @param {done} callback function(err) {}
   exports.onConnect = function(client, done) {
     // Faye client
     // client.subscribe('/channel', function(message) { });

     // Socket.io client
     // client.emit('test', { hello: 'world' });

     // Primus client
     // client.write('Sailing the seas of cheese');


    * Send a message (required)
    * @param {client} client connection
    * @param {done} callback function(err) {}
   exports.sendMessage = function(client, done) {
     // Example:
     // client.emit('test', { hello: 'world' });
     // client.publish('/test', { hello: 'world' });


See also

French article about websocket-bench : Benchmarking websockets avec Node.Js

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