#run this file to create load a local mongo DB with about 1M documents. Takes about 6 minutes to run, prints gradual results.
require 'mongo'

include Mongo

#$mongo = MongoClient.from_uri('mongodb://localhost:27017/mongoLoad').db('mongoLoad')
$mongo = MongoClient.new('localhost', 27017, pool_size: 10, pool_timeout: 10).db('mongoLoad')


$coll = $mongo.collection('users')
$coll.remove

def insert_docs(n = 100000)
  thread_start = Time.now
  (1..n).each do |i|
    $coll.insert({index: i, text: 'Lorem Ipsum'});
    msg = "Thread #{Thread.current.object_id} - #{i}/#{n} done; time passed: #{Time.now - thread_start}"
    puts msg if i%1000 == 0
  end
end

before = Time.now
num_threads = 10
threads = []
(1..num_threads).each {|j| threads << Thread.new(nil) { insert_docs } }
threads.each { |thr| thr.join }

puts "time taken: #{Time.now - before}; num_docs_now: #{$coll.count}"