Test Promise memory usage during recursive promises

1-promise-test.js

const Promise = require('bluebird');
const memwatch = require('memwatch-next');

function async() {
  return Promise.resolve();
}

function run(iter=0) {
  if (iter >= 10000000) { return Promise.resolve(); }
  return async()
    .then(() => run(iter + 1));
}

const hd = new memwatch.HeapDiff();
run()
  .catch((err) => {console.error(err)})
  .finally(() => {
    const diff = hd.end();
    console.log(diff);
  });

2-output.txt

$ NODE_ENV=production node promise-test.js                                                                                                    
{ before: { nodes: 33277, size_bytes: 4948264, size: '4.72 mb' },
  after: { nodes: 31863, size_bytes: 4683560, size: '4.47 mb' },
  change: 
   { size_bytes: -264704,
     size: '-258.5 kb',
     freed_nodes: 2740,
     allocated_nodes: 1326,
     details: 
      [ [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object] ] } }