Node js prod tools

tools.js

var heapdump = require('heapdump');

//Grab a heapdump if the memory increase goes over 250mb
var nextMBThreshold = 0;
setInterval(function () {
  var memoryMB = process.memoryUsage().rss / 1048576;
  if (memoryMB > nextMBThreshold) {
    heapdump.writeSnapshot();
    nextMBThreshold += 250;
  }
}, 6000 * 2);

//log the event loop blocked time
module.exports = function(fn) {
var start = process.hrtime();
var interval = 100;
setInterval(function(){
    var delta = process.hrtime(start);
    var nanosec = delta[0] * 1e9 + delta[1];
    var ms = nanosec / 1e6;
    var n = ms - interval;
    if (n > 10) fn(Math.round(n));
    start = process.hrtime();
    }, interval).unref();
};