Tristan Bailey tristanbailey

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 cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

There's no shortage of good resources for learning laravel. So instead of the usual introductory tutorial were just gonna learn Laravel by building a project from scratch and that's gonna be a User Management System.

I don't know if my definition of a User Management System is correct but here's my idea of what's it's capable of doing:

Register Roles
Register Users
Update Users

BodyClass Generator

This method will create a string of body classes based on common variables, like the currently active option, view, and layout. It also splits the path of the currently loaded URL and puts it into the class string.

The advantages of this is that it allows you to style views as well as layouts and specific pages on your site.

	#! /bin/sh
	### BEGIN INIT INFO
	# Provides: supervisord
	# Required-Start: $remote_fs
	# Required-Stop: $remote_fs
	# Default-Start: 2 3 4 5
	# Default-Stop: 0 1 6
	# Short-Description: Example initscript
	# Description: This file should be used to construct scripts to be
	# placed in /etc/init.d.

	<?php
	require 'path-to-Stripe.php';

	if ($_POST) {
	Stripe::setApiKey("YOUR-API-KEY");
	$error = '';
	$success = '';
	try {
	if (!isset($_POST['stripeToken']))
	throw new Exception("The Stripe Token was not generated correctly");

	# all php files :: disallow direct access of file
	# between <?php and ?>
	defined('_JEXEC') or die;

	# index.php :: define variable with application
	# between <?php and ?>
	$app = JFactory::getApplication();

	# index.php :: define variable with document
	# between <?php and ?>

	## Begin - Custom redirects
	#
	# If you need to redirect some pages, or set a canonical non-www to
	# www redirect (or vice versa), place that code here. Ensure those
	# redirects use the correct RewriteRule syntax and the [R=301,L] flags.
	#
	# Disable native RSS Feed of Joomla by Marco
	RewriteCond %{QUERY_STRING} format=feed
	RewriteRule .* http://www.yourdomain.com? [R=301,L]
	## End - Custom redirects

	<?php
	ini_set("error_reporting", E_ALL & ~E_NOTICE);
	?>
	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
	<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<title>Genetic Algorithm : TSP : PHP Implementation by Thomas Hunter</title>
	<style>
	body {