big_calculation_async_parallel.js

var async = require('async');

function big_calculation() {
  var count = 0;
  for (var i = 0; i < 100000; i++) {
    for (var j = 0; j < 100000; j++) {
      count += 1;
    }
  }
  return count;
}

function sync_big_calculation() {
  big_calculation();
  big_calculation();
}

function parallel_big_calculation() {
  async.parallel([
    function(callback) {
      big_calculation()
      callback(null);
    },
    function(callback) {
      big_calculation()
      callback(null)
    }
  ]);
}

console.time('big_calculation times two');
sync_big_calculation();
console.timeEnd('big_calculation times two');

console.time('with async-parallel');
parallel_big_calculation();
console.timeEnd('with async-parallel');