Simple ab style load generator

load.js

// requires request, measured, optimist and microtime npm modules
var util = require('util')
  , request = require('request')
  , microtime = require('microtime')
  , measured   = require('measured')
  , collection = new measured.Collection('http')
  , argv = require('optimist').usage('node load.js -c [concurrent] -n [total] url').argv;

var c = argv.c || 1
  , n = argv.n || 1, uri = argv._[0]
  , running = 0, ran=0, finished=0
  , timer = collection.timer(uri);

var statusInterval = setInterval(function() {
    console.log([running, ran, finished, (Math.round(100*finished/n)) + "%"].join(', '));
}, 2000);

(function run(uri) {
    running++; ran++;
    if( running < c ) run(uri);
    var start = microtime.now();

    request(uri,  function (error, response, body) {
        running--;  finished++;
        timer.update(microtime.now() - start);

        if(ran !== n) run(uri);
        if(finished === n) {
            console.log(util.inspect(collection.toJSON(), false, 10));
            clearInterval(statusInterval);
            process.exit(0);
        }
    });
}(uri));