Chris Boden cboden

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

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

React v0.2.4 is more awesome

DNS promises

This release has two major improvements. The first one is that react/dns is now using a promise based API. In case you missed it, react/promise is a PHP library for promises. Take a look at the README and familiarize yourself with it, as it will be used by many libs in the react ecosystem, including core.

The previous API was:

$dns->resolve('igor.io', function ($ip) {

echo "Yay, the IP is $ip.\n";

	#
	# Wide-open CORS config for nginx
	#
	location / {

	if ($request_method = 'OPTIONS') {

	add_header 'Access-Control-Allow-Origin' '*';

	#

	<html>
	<head>
	<script>
	function debug(string) {
	var element = document.getElementById("debug");
	var p = document.createElement("p");
	p.appendChild(document.createTextNode(string));
	element.appendChild(p);
	}

	<?php
	use Ratchet\MessageComponentInterface;
	use Ratchet\ConnectionInterface;
	use Ratchet\Server\IoServer;
	use Ratchet\WebSocket\WsServer;

	/**
	* chat.php
	* Send any incoming messages to all connected clients (except sender)
	*/

	{
	"_links": {
	"self": { "href": "/orders" },
	"next": { "href": "/orders?page=2" },
	"find": { "href": "/orders{?id}", "templated": true }
	},
	"_embedded": {
	"orders": [{
	"_links": {
	"self": { "href": "/orders/123" },

	<script type="text/ng-template" id="one.html">
	<div>This is first template</div>
	</script>

	<script type="text/ng-template" id="two.html">
	<div>This is second template</div>
	</script>

	// Stateful is a simple implementation of the state pattern for javascript.
	//
	// Read more on this design pattern here:
	// -> http://sourcemaking.com/design_patterns/state
	//
	// Initialize Stateful by passing it an object, the name of the initial state
	// (defaults to "default"), and an optional hash of interfaces that will be
	// applied for each state. If these interfaces are not passed, they default to
	// the object's constructor's States property. So, for example:
	//

	// Source: https://groups.google.com/forum/#!topic/angular/hVrkvaHGOfc
	// jsFiddle: http://jsfiddle.net/pkozlowski_opensource/PxdSP/14/
	// author: Pawel Kozlowski

	var myApp = angular.module('myApp', []);

	//service style, probably the simplest one
	myApp.service('helloWorldFromService', function() {
	this.sayHello = function() {
	return "Hello, World!"