问使用socket.io + node.js的内存泄漏

EN

#!/usr/local/bin/node

var port = 8081;

var io = require('socket.io').listen(port),
sys = require('sys'),
daemon = require('daemon'),
mysql = require('mysql-libmysqlclient');

var updateq = "SELECT 1=1";
var countq = "SELECT 2=2";

io.set('log level', 2);


process.on('uncaughtException', function(err) {
  console.log(err);
});

var connections = 0;

var conn = mysql.createConnectionSync();
dbconnect();

io.sockets.on('connection', function(client){ 
  connections++;
  client.on('disconnect', function(){ connections--;  }) 
});

process.on('exit', function () {
    console.log('Exiting');
    dbdisconnect();
});

function dbdisconnect() {
     conn.closeSync();
}

function dbconnect() {
    conn.connectSync('leet.hacker.org','user','password');
}


function update() {
    if (connections == 0)
        return;
    conn.query(updateq, function (err, res) {
      if (err) {
        dbdisconnect();
        dbconnect();
        return;
      }
      res.fetchAll(function (err, rows) {
        if (err) {
          throw err;
        }
        io.sockets.json.send(rows);
      });
    });
}

function totals() {
    if (connections == 0)
        return;
        conn.query(countq, function (err, res) {
          if (err) {
        // Chances are that the server has just disconnected, lets try reconnecting
        dbdisconnect();
        dbconnect();
            throw err;
          }
          res.fetchAll(function (err, rows) {
            if (err) {
              throw err;
            }
        io.sockets.json.send(rows);
          });
        });

}

setInterval(update, 250);
setInterval(totals,1000);

setInterval(function() {
console.log("Number of connections: " + connections);
},1800000);



  daemon.daemonize('/var/log/epiclog.log', '/var/run/mything.pid', function (err, pid) {
    // We are now in the daemon process
    if (err) return sys.puts('Error starting daemon: ' + err);

    sys.puts('Daemon started successfully with pid: ' + pid);
  });

function totals() {

        if (connections > 0)
        {
                var q = "SELECT query FROM table";

            db.query(q, function (err, results, fields) {
            if (err) {
                    console.error(err);
                    return false;
            }

            for (var row in results)
            {
                    io.sockets.send("{ ID: '" + results[row].ID + "', event: '" + results[row].event + "', free: '" + results[row].free + "', total: '" + results[row].total + "', state: '" + results[row]$
                    row = null;
            }


            results = null;
            fields = null;
            err = null;
            q = null;
            });
    }
}