Randy Bares Aeramor

Creating a dynamic site-to-site VPN with OpenSwan on Ubuntu 10.04 on EC2

There are many tutorials floating around the web that almost get you a dynamic VPN in EC2. The goal of this tutorial is to be a one-stop-shop for this specific setup.

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

	<!doctype html>

	<!-- http://taylor.fausak.me/2015/01/27/ios-8-web-apps/ -->

	<html>
	<head>
	<title>iOS 8 web app</title>

	<!-- CONFIGURATION -->

	// an IIFE that illustrates different implementations
	// of $.post() with Promises
	//
	// Check out jsFiddle `jQuery and Promises with UI animation`
	// - demonstrates $.Deferrred() and custom $.when()
	// - @ http://jsfiddle.net/ThomasBurleson/RTLr6/179/
	//
	var onSubmitFeedback = (function () {

	var target = $("#container").append("<div class='spinner'>");

	#!/bin/sh
	#
	#
	# Original source: http://forum.utorrent.com/viewtopic.php?id=88044
	#
	# uTorrent start stop service script
	#
	# copy to /etc/init.d
	# run "update-rc.d utorrent defaults" to install
	# run "update-rc.d utorrent remove" to remove

	# inspired by http://ariejan.net/2010/08/23/resque-how-to-requeue-failed-jobs

	# retry all failed Resque jobs except the ones that have already been retried
	# This is, for instance, useful if you have already retried some jobs via the web interface.
	Resque::Failure.count.times do \|i\|
	Resque::Failure.requeue(i) unless Resque::Failure.all(i, 1)['retried_at'].present?
	end

	# retry all :)
	Resque::Failure.count.times do \|i\|