Frank Denis jedisct1

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns                     on recent CPU
L2 cache reference ........................... 7 ns                     14x L1 cache
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns                     20x L2 cache, 200x L1 cache
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 4X memory

Moved to my blog.

	<?xml version="1.0"?>
	<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
	<fontconfig>

	<!--
	Documented at
	http://linux.die.net/man/5/fonts-conf

	To check font mapping run the command at terminal
	$ fc-match 'helvetica Neue'

	1) Start with only one known domain from a botnet: qwmrxczhrcmbcagehqwxlvsnj.ru

	2) Get the intersection of names looked up by the IPs having looked up this domain. It takes less than 1 minute.

	$ curl https://sgraph.umbrella.com/dnsdb/clientlookups/i/name/qwmrxczhrcmbcagehqwxlvsnj.ru \| sort -rn > /tmp/a

	3) Remove popular domains

	cut -f2 /tmp/a \| filter-popular > /tmp/aa

	accelerateaccountant.in.net
	accelerateactor.in.net
	accelerateactress.in.net
	accelerateactuary.in.net
	accelerateadvisor.in.net
	accelerateaide.in.net
	accelerateambassador.in.net
	accelerateanimator.in.net
	acceleratearcher.in.net
	acceleratearchery.in.net

	#!/usr/bin/python

	# Quick and dirty demonstration of CVE-2014-0160 by Jared Stafford ([email protected])
	# The author disclaims copyright to this source code.

	import sys
	import struct
	import socket
	import time
	import select

-#!/usr/bin/env ruby
-# To make it work:
-# - change account details to yours ( obviously ;) )
-# - install mechanize gem in version 1.0.0 ( gem install mechanize -v '1.0.0' )
-# - look for !!HERE!! comments in code in case you'd like to change default behavior
-# - for best results run this script few times as hipchat / ruby openssl don't play together that well and
-#   there might be an exception thrown from time to time. Script should retry then but hey.. Nobody is perfect.
-# .. and finally. Remember that other part should run this script as well to make history clean.

	#!/bin/sh

	remove_dangling() {
	echo "Removing dangling images ..."
	docker rmi $(docker images -f dangling=true -q)
	}

	remove_stopped_containers() {
	echo "Removing stopped containers ..."
	docker rm $(docker ps -qa)

	$ cat > /tmp/handler.sh
	#! /bin/bash
	echo auth_ok:1
	echo uid:42
	echo gid:21
	echo dir:/tmp
	echo end
	^D

	$ chmod +x /tmp/handler.sh