gistfile1.txt

#!/usr/bin/env node
var os = require('os');
var WebSocketClient = require('websocket').client;

var count = 0;

function recursion() {
  var client = new WebSocketClient();

  client.on('connectFailed', function(error) {
      console.log("Connect Error: " + error.toString());
  });

  client.on('connect', function(connection) {
      count++;
      connection.on('error', function() {
        console.log(arguments);
      });

      connection.on('close', function(code, err) {
          count--;
          console.log("Client closed at: "+count+". Reason : " + err);
	  process.exit(0);
      })

      if(count % 500 == 0) {
        // sleep for 5 seconds
      	var f = os.freemem();
      	var t = os.totalmem();
      	console.log('RAM: ' + (f/t * 100) + ', LOAD AVG: ' + os.loadavg().join());

        var sleepfor = 5000;
      	setTimeout(function() {
          console.log('active connections: ' + count);
          recursion();
        }, sleepfor);
      } else {
        recursion();
      }
  });

  var random_node_id = function() {
   return Math.floor(Math.random()*90000) + 10000;
  };

  var random_client_id = function() {
   return Math.floor(Math.random()*900) + 100;
  };

  client.connect("ws://127.0.0.1:8888/echo/"+random_node_id()+"/"+random_client_id()+"/websocket", 'echo-protocol');
};

recursion();