Renzo Canepa rcanepa

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

Moved

Now located at https://github.com/JeffPaine/beautiful_idiomatic_python.

Why it was moved

Github gists don't support Pull Requests or any notifications, which made it impossible for me to maintain this (surprisingly popular) gist with fixes, respond to comments and so on. In the interest of maintaining the quality of this resource for others, I've moved it to a proper repo. Cheers!

THIS GIST WAS MOVED TO TERMSTANDARD/COLORS REPOSITORY.

PLEASE ASK YOUR QUESTIONS OR ADD ANY SUGGESTIONS AS A REPOSITORY ISSUES OR PULL REQUESTS INSTEAD!

This is a plain-text version of Bret Victor’s reading list. It was requested by hf on Hacker News.

Highly recommended things!

This is my five-star list. These are my favorite things in all the world.

A few of these works have had an extraordinary effect on my life or way of thinking. They get a sixth star. ★

Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

	;;
	;; NS CHEATSHEET
	;;
	;; * :require makes functions available with a namespace prefix
	;; and optionally can refer functions to the current ns.
	;;
	;; * :import refers Java classes to the current namespace.
	;;
	;; * :refer-clojure affects availability of built-in (clojure.core)
	;; functions.

	function stackTrace() {
	$stack = debug_backtrace();
	$output = 'Stack trace:' . PHP_EOL;

	$stackLen = count($stack);
	for ($i = 1; $i < $stackLen; $i++) {
	$entry = $stack[$i];

	$func = $entry['function'] . '(';
	$argsLen = count($entry['args']);

	// When using Polymorphism, you might define an abstract class to send a message like
	// follows, then fully implement it several times in different classes.

	abstract class BaseMessage
	public void setMessageText messageText
	@messageText = messageText
	end

	public void send;
	end

	<!doctype html>
	<html lang="es">
	<head>
	<meta charset="UTF-8">
	<title>Validador de RUT HTML5</title>
	</head>
	<body>
	<form>
	<input type="text" id="rut" name="rut" required oninput="checkRut(this)" placeholder="Ingrese RUT">
	<button type="submit">Validar RUT y Enviar Form</button>