solos

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

	from gzip import GzipFile
	import zlib
	from StringIO import StringIO
	import urllib2


	class GzipHandler(urllib2.BaseHandler):
	"""A handler to add gzip capabilities to urllib2 requests """
	# add headers to requests
	def http_request(self, req):

	from selenium import webdriver
	from selenium.common.exceptions import TimeoutException
	import selenium.webdriver.support.wait
	selenium.webdriver.support.wait.POLL_FREQUENCY = 0.05

	import re
	import random
	import collections

	class AdwordsAutomater(object):

	// requires
	var utils = require('utils');
	var casper = require('casper').create()
	var casper = require('casper').create({
	verbose: true,
	logLevel: "debug"
	});

	// setup globals
	var email = casper.cli.options['email'] \|\| 'REPLACE THIS EMAIL';

	<!doctype html>
	<html>
	<head>
	<title>粘贴传图Ctrl + V</title>
	<script src="jquery-1.6.1.min.js" charset="utf-8"></script>
	</head>
	<body>
	<p id="notice"></p>
	<script language="javascript">
	window.onload=function(){

	#!/usr/bin/env python

	"""
	urlnorm.py - URL normalisation routines

	urlnorm normalises a URL by;
	* lowercasing the scheme and hostname
	* taking out default port if present (e.g., http://www.foo.com:80/)
	* collapsing the path (./, ../, etc)
	* removing the last character in the hostname if it is '.'

	#!/usr/bin/env python
	# -- coding: utf-8 --

	"""Simple async crawler/callback queue based on gevent."""

	import traceback
	import logging
	import httplib2

	import gevent

	# -- coding: utf-8 --
	"""
	This is an example of a basic optical character recognition system.
	Some components, such as the featurizer, are missing, and have been replaced
	with data that I made up.

	This system recognizes words produced from an alphabet of 2 letters: 'l' and 'o'.
	Words that can be recognized include, 'lol', 'lolol', 'and loooooll'.
	We'll assume that this system is used to digitize hand-written notes by Redditors,
	or something.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	Version 2, December 2004

	Copyright (C) 2011 Olivier Scherrer

	Everyone is permitted to copy and distribute verbatim or modified
	copies of this license document, and changing it is allowed as long
	as the name is changed.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE

	from pqueue import PersistentQueue

	q1 = PersistentQueue("/tmp/queue_storage_dir")
	q1.put("1")
	q1.put("2")
	q1.put("3")
	q1.close()

	q2 = PersistentQueue("/tmp/queue_storage_dir")
	while not q2.empty():