Bran van der Meer branneman

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

Sample service script for debianoids

Look at LSB init scripts for more information.

Usage

Copy to /etc/init.d:

# replace "$YOUR_SERVICE_NAME" with your service's name (whenever it's not enough obvious)

	if (typeof window.localStorage == 'undefined' \|\| typeof window.sessionStorage == 'undefined') (function () {

	var Storage = function (type) {
	function createCookie(name, value, days) {
	var date, expires;

	if (days) {
	date = new Date();
	date.setTime(date.getTime()+(days2460601000));
	expires = "; expires="+date.toGMTString();

	.whatever {
	-webkit-box-shadow: 0 2px 2px rgba(0,0,0,0.5) inset;
	-moz-box-shadow: 0 2px 2px rgba(0,0,0,0.5) inset;
	-o-box-shadow: 0 2px 2px rgba(0,0,0,0.5) inset;
	box-shadow: 0 2px 2px rgba(0,0,0,0.5) inset;
	}

	<?php

	$src = 'foo { border-radius: 4px; }
	bar { box-shadow: 5px 0 0 rgba(0, 0, 0, .5);
	baz { background-image: url(img/baz.png); }
	quux { background-image: url(img/quuz.png#!); }';

	preg_match_all('/url\((.*\.png)\)/U', $src, $matches);
	foreach ($matches[1] as $match) {
	$src = str_replace($match, 'data:image/png;base64,' . base64_encode(file_get_contents($match)), $src);

 <!doctype html>
 <!--
 WARNING!
 You probably shouldn't use this technique since images never show up
 if the script isn't loaded for one reason or another. Some reasons:
 - The content is viewed using a RSS reader
 - The content is viewed with a read-it-later service
 - The user has a flaky connection (hotel wifi, Dutch train, etc)
  -->

	# try
	# 48kbit/s for Dialup
	# 64kbit/s for Edge
	# 384kbit/s for 3G
	# 768kbit/s for DSL
	# 1572kbit/s for T1
	#
	# to simulate low bandwidths.
	#
	# And: You can play with the delay option.

	// This is an lite version of `async`, see https://github.com/caolan/async
	//
	// es5shim.js is required for old version browsers
	//
	// Author: Gui Lin
	// Email: [email protected]


	var async = {};

	{
	// --------------------------------------------------------------------
	// JSHint Configuration, Strict Edition
	// --------------------------------------------------------------------
	//
	// This is a options template for [JSHint][1], using [JSHint example][2]
	// and [Ory Band's example][3] as basis and setting config values to
	// be most strict:
	//
	// * set all enforcing options to true

	#!/bin/sh
	#
	# Automatically adds branch name to every commit message.
	#
	NAME=$(git branch \| grep '' \| sed 's/ //')
	if [ -n "$NAME" ]
	then
	if [ "$NAME" = "master" ]
	then
	echo $(cat "$1") > "$1"