cache_version bench.rb

# frozen_string_literal: true

begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do
  source "https://rubygems.org"

  gem "activerecord", path: "."
  gem "activesupport", path: "../activesupport"
  gem "activemodel", path: "../activemodel"

  gem "benchmark-ips"
  gem 'pg'
  gem "pry"
end

require "active_record"
require "benchmark/ips"


conn = { adapter: "postgresql", database: "bench" }

ActiveRecord::Base.establish_connection(conn)

class User < ActiveRecord::Base
  connection.create_table :users, force: true do |t|
    t.timestamps
  end
end

user = User.create!
user.reload
attributes = user.instance_variable_get(:@attributes).deep_dup

puts "New: #{user.updated_at_before_type_cast.to_param}"
puts "New keeping format: #{user.updated_at_before_type_cast.delete('- :.').to_param}"
puts "Original: #{user.updated_at.utc.to_s(:usec).to_param}"

Benchmark.ips do |x|
  x.report("New") do
    user.instance_variable_set(:@attributes, attributes.deep_dup)
    user.updated_at_before_type_cast.to_param
  end

  x.report "New keeping format" do
    user.instance_variable_set(:@attributes, attributes.deep_dup)
    user.updated_at_before_type_cast.delete('- :.')
  end

  x.report "Original" do
    user.instance_variable_set(:@attributes, attributes.deep_dup)
    user.updated_at.utc.to_s(:usec).to_param
  end



  x.compare!
end

# New: 2018-10-11 01:28:30.836427
# New keeping format: 20181011012830836427
# Original: 20181011012830836427
# Warming up --------------------------------------
#                  New    26.080k i/100ms
#   New keeping format    23.679k i/100ms
#             Original     7.127k i/100ms
# Calculating -------------------------------------
#                  New    292.214k (± 9.0%) i/s -      1.460M in   5.033789s
#   New keeping format    250.280k (± 8.5%) i/s -      1.255M in   5.045426s
#             Original     69.712k (± 5.5%) i/s -    349.223k in   5.024369s
# 
# Comparison:
#                  New:   292214.1 i/s
#   New keeping format:   250279.6 i/s - same-ish: difference falls within error
#             Original:    69711.7 i/s - 4.19x  slower