Vignesh Jayavel vignesh-jayavel

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

	# More info at https://github.com/guard/guard#readme

	guard 'spork', test_unit: false, cucumber: false, :rspec_env => { 'RAILS_ENV' => 'test' }, wait: 200 do
	watch(%r{app/controllers/}) #change controllers -> restart spork(my spork caches controllers)
	watch('config/application.rb')
	watch('config/environment.rb')
	watch('config/environments/test.rb')
	watch(%r{^config/initializers/.+\.rb$})
	watch('Gemfile.lock')
	watch('spec/spec_helper.rb') { :spec }

	# === EDITOR ===
	Pry.editor = 'vim'

	# == Pry-Nav - Using pry as a debugger ==
	Pry.commands.alias_command 'c', 'continue' rescue nil
	Pry.commands.alias_command 's', 'step' rescue nil
	Pry.commands.alias_command 'n', 'next' rescue nil
	Pry.commands.alias_command 'r!', 'reload!' rescue nil

	Pry.config.color = true

	#spec/spec_helper.rb
	require 'spork/app_framework/rails'
	Spork::AppFramework::Rails::NinjaPatcher.class_eval do
	# views are preloaded spork must be restarted for view changes
	def delay_eager_view_loading
	puts "removed because i am too slow..."
	end

	# do not preload application files
	# alternatively urn off config.cache_classes