mtkd

`ps -o rss= -p #{$$}`.to_i

mtkd

User (references_one Address)
Address (referenced_in User)

user = User.make
address = Address.make
user.address = address
user.save                   # does not work, the change does not persist

user.address.save           # works and change persists

mtkd

# tl;dr if state_machine is in the model when a record is created, there is a record in Mongo, but you can't do a find() on it

# If state_machine is in the model when the record is created:

ruby-1.9.2-p0 > Upload.first.id
 => BSON::ObjectId('4db2a774c4054453d000000c') 

ruby-1.9.2-p0 > BSON::ObjectId.from_string('4db2a774c4054453d000000c')
 => BSON::ObjectId('4db2a774c4054453d000000c') 

mtkd

require 'benchmark'
require 'uuidtools'
require 'ffi-uuid'
require 'uuid'
Benchmark.bm do |x|
  x.report { 100000.times do; UUIDTools::UUID.timestamp_create.to_s; end; }
  x.report { 100000.times do; UUID.generate.to_s; end; }
  x.report { 100000.times do; FFI::UUID.generate_time.to_s; end; }
end

mtkd

require 'benchmark'
require 'json'
require 'yajl'

data = ''
f = File.open("test.json", "r") 
f.each_line do |line|
  data += line
end

mtkd

require 'ipaddr'
require 'benchmark'

def iptoint1(ip)
  IPAddr.new(ip, Socket::AF_INET).to_i
end

def iptoint2(ip)
  if (ip.kind_of?(String) &&
      ip =~ /^([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)$/)

mtkd

#To see how many models in a Rails project are not using attr_accessible:

$find app/models -type f -name \*.rb | wc -l
$grep -r -m1 "attr_accessible app/models | wc -l

mtkd

require 'benchmark'
require 'json'
require 'yajl'

data = ''
f = File.open("test.json", "r") 
f.each_line do |line|
  data += line
end

mtkd

s = %Q{
Maximum connect burst length: 1

Total: connections 20000 requests 20000 replies 20000 test-duration 592.676 s

Connection rate: 33.7 conn/s (29.6 ms/conn, <=1 concurrent connections)
Connection time [ms]: min 10.8 avg 29.6 max 11652.5 median 11.5 stddev 217.1
Connection time [ms]: connect 27.6
Connection length [replies/conn]: 1.000

mtkd

require 'benchmark'

first_name = "first"
last_name = "last"

Benchmark.bm do |x|
  x.report { 100000.times do; "#{first_name} #{last_name}" ; end; }
  x.report { 100000.times do; [first_name, last_name].join(' ') ; end; }
  x.report { 100000.times do; '%s %s' % [first_name, last_name] ; end; }
  x.report { 100000.times do; first_name + ' ' + last_name ; end; }