Bench connections in mqtt

bench.js

/*
  run file with command node bench 10000
  where 10000 is the number of clients you want to connect
*/

 'use strict'

var queue = require('fastq')(worker, 10)
var mqtt = require('mqtt')
var connected = 1
var clients = []
var count = 0
var st = Date.now()
function worker (arg, cb) {
   clients[count]  = mqtt.connect({
        host: "127.0.0.1",
        port : 1886
   })
   clients[count].on('connect', con)
   count++
  cb(null, 42 * 2)
}

for (var i = 0; i < process.argv[2]; i++) {
    queue.push(42, function() {})
}

function con () {
    connected++
    if (connected == process.argv[2]) {
        console.log('done', Date.now() - st)
    }
}