testVm.js

var vm = require("vm");
var i = 0;
var iterations = 2000;
var interval;

var startMem = process.memoryUsage().rss;
var lastMem = startMem;
var iteration = function() {

    var sb = {};
    sb.result = null;
    sb.options = {};

    var script = "result = 1;";
    vm.runInNewContext(script, sb, {displayErrors: true, timeout: 5000}); 
    sb = null;


    if (global.gc) {
        global.gc();
    }



    i++;
    var mem = process.memoryUsage().rss;

    var newMem = ((mem - lastMem)/(1024*1024)).toFixed(2);
    var totalMem =((mem - startMem)/(1024*1024)).toFixed(2);
    console.log(i +": " + totalMem + " MB" + " (" + newMem + "MB)");

    lastMem = mem;


    if(i >= iterations){
        clearInterval(interval);
        process.reallyExit();
    }
}




interval = setInterval(iteration, 10);