setImmediate overhead

gistfile1.js

'use strict';

function getOverhead() {
  var immediate = null;
  var overhead  = [0, 0];

  var latestStart;

  function handler() {
    var diff = process.hrtime(latestStart);
    overhead[0] += diff[0];
    overhead[1] += diff[1];
    immediate = setImmediate(handler);
    latestStart = process.hrtime();
  }

  latestStart = process.hrtime();
  handler();

  setTimeout(function () {
    clearImmediate(immediate);
    console.log(overhead);
  }, 10000);
}

getOverhead();