Arbaaz arbaaz

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

An Ansible summary

Jon Warbrick, July 2014, V3.2 (for Ansible 1.7)

Configuration file

intro_configuration.html

First one found from of

	# SSL self signed localhost for rails start to finish, no red warnings.

	# 1) Create your private key (any password will do, we remove it below)

	$ openssl genrsa -des3 -out server.orig.key 2048


	# 2) Remove the password

	$ openssl rsa -in server.orig.key -out server.key

	/*==================================================
	= Bootstrap 3 Media Queries =
	==================================================*/

	/========== Mobile First Method ==========/

	/* Custom, iPhone Retina */
	@media only screen and (min-width : 320px) {

	}

	#!/usr/bin/env bash
	# Ask for the administrator password upfront
	sudo -v

	# Keep-alive: update existing `sudo` time stamp until the script has finished
	while true; do sudo -n true; sleep 60; kill -0 "$$" \|\| exit; done 2>/dev/null &

	install_thoughtbot() {
	mkdir -p "$HOME/installer/logs" && cd "$HOME/installer"

	require 'active_support'
	module CRUDActions
	extend ActiveSupport::Concern

	included do
	before_action :set_resource, only: [:show, :update, :destroy]
	end

	# Returns count of records matching the scope
	def count