test.js

var express = require('express'),
    plotter = require('plotter'),
    vm = require('vm'),
    app = express(),
    share = {},
    memoryHeapUsage = [],
    memoryRSS = [],
    curReqs = 0,
    reqs = [],
    responsetimes = [],
    responseAvg = [],
    vhosts = {
        "www.house-of-code.org": vm.createContext({app: app, require: require, share: share}),
        "test.house-of-code.org": vm.createContext({app: app, require: require, share: share})
    };

var vhostWWW = vm.createScript("var express = require('express')," +
                               "    vhostApp = express();" +
                               "    share.wwwReqs = 0;" +

                               "vhostApp.get('/', function(req, res) {" +
                               "    res.end('WWW'); share.wwwReqs += 1;" +
                               "});" +

                               "app.use(express.vhost('www.house-of-code.org', vhostApp));");

vhostWWW.runInContext(vhosts["www.house-of-code.org"]);

var vhostTest = vm.createScript("var express = require('express')," +
                                "    vhostApp = express();" +

                                "vhostApp.get('/', function(req, res) {" +
                                "    res.end(share.wwwReqs.toString());" +
                                "});" +

                                "app.use(express.vhost('test.house-of-code.org', vhostApp));");

vhostTest.runInContext(vhosts["test.house-of-code.org"]);

setInterval(function () {
    "use strict";

    if (memoryHeapUsage.length > 600) {
        memoryHeapUsage.splice(0, 1);
    }

    memoryHeapUsage.push((process.memoryUsage()['heapUsed'] / (1024 * 1024)));

    if (memoryRSS.length > 600) {
        memoryRSS.splice(0, 1);
    }

    memoryRSS.push((process.memoryUsage()['rss'] / (1024 * 1024)));

    if (reqs.length > 600) {
        reqs.splice(0, 1);
    }

    reqs.push(curReqs);
    curReqs = 0;

    var sum = 0;
    for(var i = 0; i < responsetimes.length; i++){
        sum += parseInt(responsetimes[i]);
    }

    var avg = sum/responsetimes.length;
    responsetimes = [];

    if (responseAvg.length > 600) {
        responseAvg.splice(0, 1);
    }

    responseAvg.push(avg);

}, 1000);

setInterval(function () {
    "use strict";

    plotter.plot({
        data:       { 'rss': memoryRSS, 'heapUsage' : memoryHeapUsage, 'reqs' : reqs, 'respAvg': responseAvg },
        filename:   'output.pdf',
        style:      'linespoints',
        title:      'Testcase with VM Code',
        logscale:   true,
        xlabel:     'Time',
        ylabel:     'MegaBytes / Reqs / ms'
    });
}, 60000);

app.get("/", function (req, res) {
    "use strict";

    res.sendfile("output.pdf");
});

app.listen(1234).on('connection', function(sock) {
    curReqs += 1;
    sock.start = (new Date()).getTime();

    var resEnd = sock.end;
    sock.end = function(data) {
    	responsetimes.push((new Date()).getTime() - sock.start);
	resEnd(data);
    }
});

setTimeout(function() {
    process.exit();
}, 602*1000);