promise-vs-thunk-in-fast-loop

test.js

var co = require('co');
//var Promise = require('bluebird');
//var Promise = require('promise');
var count = 0;

co(function* () {
  while (true) {
    count++;
    try {
      yield getData();
      //yield getDataThunk();
    } catch (err) {
      console.error(err);
    }
    yield sleep(10);
    if (global.gc) {
      global.gc();
    }
    if (count % 100 === 0) { 
      console.log('run %d, %smb', count, process.memoryUsage().rss / 1024 / 1024);
    }
    if (count > 1000) {
      return;
    }
  }
}).catch(function (err) {
  throw err;
});

function sleep(ms) {
  return function (callback) {
    setTimeout(callback, ms);
  };
}

function getData() {
  return new Promise(function(resolve, reject) {
    resolve(new Array(10000).join('-'));
  });
}

function getDataThunk() {
  return function (callback) {
    callback(null, new Array(10000).join('-'));
  };
}

// bluebird promise, with gc

df-air:test df$ node --harmony --expose-gc test.js
run 100, 18.65234375mb
run 200, 19.58203125mb
run 300, 20.59765625mb
run 400, 22.23046875mb
run 500, 22.234375mb
run 600, 22.23828125mb
run 700, 22.23828125mb
run 800, 22.40625mb
run 900, 22.484375mb
run 1000, 22.484375mb

// then/promise, with gc

df-air:test df$ node --harmony --expose-gc test.js
run 100, 17.0078125mb
run 200, 17.35546875mb
run 300, 17.51171875mb
run 400, 17.6015625mb
run 500, 17.609375mb
run 600, 17.5625mb
run 700, 17.5703125mb
run 800, 17.5625mb
run 900, 17.5703125mb
run 1000, 17.65234375mb

// thunk, with gc

df-air:test df$ node --harmony --expose-gc test.js
run 100, 16.9921875mb
run 200, 17.28515625mb
run 300, 17.32421875mb
run 400, 17.42578125mb
run 500, 17.42578125mb
run 600, 17.4296875mb
run 700, 17.4296875mb
run 800, 17.4296875mb
run 900, 17.4296875mb
run 1000, 17.4296875mb