L. Pereira lpereira

One-line Tree in Python

Using Python's built-in defaultdict we can easily define a tree data structure:

def tree(): return defaultdict(tree)

That's it!

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

Original: http://www.shadowandy.net/2012/03/asus-rt-n66u-tomatousb-firmware-flashing-guide.htm

Download Asus RT-N66U Flash utility

http://support.asus.com/ServiceHome.aspx?SLanguage=en

Download Shibby RT-N66U firmware

http://tomato.groov.pl/download/K26RT-N/

	#include <assert.h>
	#include <stdarg.h>
	#include <stdbool.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>

	enum type {
	NIL,

	package main

	import (
	"fmt"
	)

	type Node struct {
	Value int
	}

	import struct
	import SocketServer
	from base64 import b64encode
	from hashlib import sha1
	from mimetools import Message
	from StringIO import StringIO

	class WebSocketsHandler(SocketServer.StreamRequestHandler):
	magic = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset=utf-8>
	<title>WebSocket test</title>
	</head>
	<body>
	<script>
	if (window.MozWebSocket) {
	window.WebSocket = window.MozWebSocket;

	/*
	* An implementation of C11 stdatomic.h directly borrowed from FreeBSD
	* (original copyright follows), with minor modifications for
	* portability to other systems. Works for recent Clang (that
	* implement the feature c_atomic) and GCC 4.7+; includes
	* compatibility for GCC below 4.7 but I wouldn't recommend it.
	*
	* Caveats and limitations:
	* - Only the ``_Atomic parentheses'' notation is implemented, while
	* the ``_Atomic space'' one is not.

	# coding=utf-8
	"""
	LICENSE http://www.apache.org/licenses/LICENSE-2.0
	"""
	import datetime
	import sys
	import time
	import threading
	import traceback
	import SocketServer

	/*
	*******************************************************************************
	* The C++ Integer To String Conversion Benchmark *
	* *
	* Version: 2.718-20131130 *
	* *
	* This benchmark is based on the solutions provided in the following *
	* stackoverflow question: *
	* *
	* http://stackoverflow.com/q/4351371 (Date: 20101204) *