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

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

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

	import traceback
	import logging
	import httplib2

	import gevent

	#!/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 '.'

	<!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(){

	// 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';

	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):

	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):

	#!/usr/bin/env python

	"""
	A pure python ping implementation using raw socket.


	Note that ICMP messages can only be sent from processes running as root.


	Derived from ping.c distributed in Linux's netkit. That code is

	body {
	font-family: Helvetica, arial, sans-serif;
	font-size: 14px;
	line-height: 1.6;
	padding-top: 10px;
	padding-bottom: 10px;
	background-color: white;
	padding: 30px; }

	body > *:first-child {

	"""
	test commit creation with pygit2

	To see the result:
	rm -rf foo && python test_cc.py && cd foo/ && git log --graph --oneline --date-order --decorate --color --all && git status && cd ..

	"""
	import os
	import sys
	import pygit2