Naïve benchmark, comparing RethinkDB to MongoDB.

mongodb.js

/**
 * Shim
 */
var Promise = require('bluebird');

/**
 * Dependencies
 */
var mongo  = require('mongodb')
,   router = require('koa-router')()
,   app    = module.exports = require('koa')();

/**
 * Utilities
 */
function Acquire () {
  return new Promise(function (resolve, reject) {
    var self = this;

    if (self.client) return resolve(self.client);

    mongo('mongodb://localhost:27017/benchmark', function (err, client) {
      if (err) return reject(err);
      self.client = client;
      resolve(self.client);
    });
  });
}

function ReadQuery (conn) {
  return new Promise(function (resolve, reject) {
    conn.collection('records')
    .findOne({
      // NOTE: ObjectId of the created document goes here.
      _id: mongo.ObjectId.createFromHexString('55783e5da412a74d22ebee69')
    }, function (err, result) {
      if (err) return reject(err);
      resolve(result);
    });
  });
}

function WriteQuery(conn) {
  return new Promise(function (resolve, reject) {
    conn.collection('records').insert({
      ip: '127.0.0.1'
    }, function (err, result) {
      if (err) return reject(err);
      resolve(result);
    });
  });
}

/**
 * Route Handlers
 */
router.get('/', function * Index () {
  var query = yield Acquire().then(ReadQuery);
  this.body = query;
});

router.post('/', function * Create () {
  var query = yield Acquire().then(WriteQuery);
  this.body = query;
});

/**
 * Mount
 */
app.use(require('koa-logger')());
app.use(router.routes());

/**
 * Boot
 */
if (!module.parent) app.listen(9292);

rethinkdb.js

/**
 * Shim
 */
var Promise = require('bluebird');

/**
 * Dependencies
 */
var rethink = require('rethinkdb')
,   Pool    = require('generic-pool').Pool
,   router  = require('koa-router')()
,   app     = module.exports = require('koa')();

var connections = Pool({
  name: 'rethinkdb',
  min: 2,
  max: 10,
  idleTimeoutMillis: 30000,
  create: function (done) {
    rethink.connect({
      db: 'benchmark'
    }, function (err, conn) {
      if (err) return done(err);
      done(null, conn);
    });
  },
  destroy: function (conn) {
    conn.close();
  }
});

/**
 * Utilities
 */
function Acquire () {
  return new Promise(function (resolve, reject) {
    connections.acquire(function (err, conn) {
      if (err) return reject(err);
      resolve(conn);
    });
  });
}

function ReadQuery (conn) {
  return rethink.table('records')
    // NOTE: ID of the created document goes here.
    .get('f1ff2553-21e4-4029-bd1a-92ff5e268369')
    .run(conn).then(function (results) {
      connections.release(conn);
      return results;
    });
}

function WriteQuery (conn) {
  return rethink.table('records').insert({
    ip: '127.0.0.1'
  }).run().then(function (results) {
    connections.release(conn);
    return results;
  });
}

/**
 * Route Handlers
 */
router.get('/', function * Index () {
  var query = yield Acquire().then(ReadQuery);
  this.body = query;
});

router.post('/', function * Create () {
  var query = yield Acquire().then(WriteQuery);
  this.body = query;
});

/**
 * Mount
 */
app.use(require('koa-logger')());
app.use(router.routes());

/**
 * Boot
 */
if (!module.parent) app.listen(9292);