t.js

var async = require('async'),
    dgram = require('dgram');

var client = dgram.createSocket('udp4');
var totalTimeTaken = 0;
var iterations = +process.argv[2];
var completed = 0;

console.log('doing', iterations, 'iterations');

var q = async.queue(function (task, cb) {
        var buf = new Buffer(task.name.toString());
        var startTime = Date.now();
        client.send(buf, 0, buf.length, 7125, '127.0.0.1', function () {
                totalTimeTaken += (Date.now() - startTime);
                completed += 1;
            cb();
        });
}, 1000);


function chunk(count) {
        var tasks = [];
        for (var i = completed; i < count + completed; i+= 1) {
                tasks.push({ name : i });
        }
        q.push(tasks);
}

var actualTime = new Date().getTime();
q.drain = function () {
        console.log('Iterations:', completed,
                    ', Average Time Taken:', (totalTimeTaken/completed),
                    ', Total CPU Time: ', totalTimeTaken,
                    ', Actual Time: ', (Date.now() - actualTime));

        if (completed >= iterations)
                process.exit(0);

        chunk(1e4);
}

chunk(1e4);