loop-insert-mongo.js

#!/usr/bin/env node

var MongoClient = require('mongodb').MongoClient,
    format = require('util').format,
    async = require('async');

MongoClient.connect('mongodb://127.0.0.1:27017/test_mongo', function(err, db) {
  if(err) throw err;

  var collection = db.collection('test_insert');
  var startTime = new Date();

  collection.remove({}, function(err) {
    if (err) return console.log('remove err: ', err);

    console.log('removed all');

    async.timesSeries(1000000, insert, function(err) {
      if (err) return console.log('end err: ', err);
      count();
    });

  });


  function insert (n, next) {
    collection.insert({ my_index: n }, function(err) {
      if (err) return next('insert err: ', err);

      console.log('insert [%s] completed', n);

      next();
    });
  }

  function count () {
    collection.count(function(err, count) {
      if (err) return console.log('count err: ', err);

      console.log(format("===> count = %s", count));

      var endTime = new Date();

      console.log('start [%s]\nend   [%s]', startTime, endTime);

      db.close();
    });
  }
});

mongo localhost:27017/test_mongo --quiet --eval "printjson(db.test_insert.count())"