Mara Morton mmorton

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

##How Homakov hacked GitHub and the line of code that could have prevented it

Please note: THIS ARTICLE IS NOT WRITTEN BY THE GITHUB TEAM or in any way associated with them. It's simply hosted as a Gist because the markdown formatting is excellent and far clearer than anything I could manage on my personal Tumblr at peternixey.com.

If you'd like to follow me on twitter my handle is @peternixey

	using Castle.MicroKernel.Registration;
	using Castle.MicroKernel.SubSystems.Configuration;
	using Castle.Windsor;
	using MyApp.BusinessLogic.Facades;

	namespace MyApp.Web.PresentationLogic.Container
	{
	public class BusinessLogicInstaller : IWindsorInstaller
	{
	public void Install(IWindsorContainer container, IConfigurationStore store)

	var profile = (function(){
	return {
	layerOptimize: "closure",
	releaseDir: "../../../release",

	packages:[{
	name:"dojo",
	location:"../../../dojo"
	}],

	<?php

	// A first run at a Zend Framework pre-1.8 bootstrap file that does not use Zend_Application
	// Not tested, just thinking out loud...

	// Do your PHP settings like timezone, error reporting
	// ..

	// Define path to application directory
	defined('APPLICATION_PATH')

	#!/usr/bin/env python

	"""
	Demo of how to extend multiprocessing.Process to communicate with
	pyzmq.
	"""

	import zmq
	from multiprocessing import Process
	import time

	{
	"ease": [0.25, 0.1, 0.25, 1.0],
	"linear": [0.00, 0.0, 1.00, 1.0],
	"ease-in": [0.42, 0.0, 1.00, 1.0],
	"ease-out": [0.00, 0.0, 0.58, 1.0],
	"ease-in-out": [0.42, 0.0, 0.58, 1.0]
	}

	package main

	import (
	"bytes"
	"encoding/hex"
	"flag"
	"fmt"
	"io"
	"log"
	"net"