Peter Demin peterdemin

Latency Comparison Numbers (~2012)

Name
L1 cache reference	0.5	ns
Branch mispredict	5	ns
L2 cachereference	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	us

How to setup a practically free CDN using Backblaze B2 and Cloudflare

⚠️ Note 2023-01-21
Some things have changed since I originally wrote this in 2016. I have updated a few minor details, and the advice is still broadly the same, but there are some new Cloudflare features you can (and should) take advantage of. In particular, pay attention to Trevor Stevens' comment here from 22 January 2022, and Matt Stenson's useful caching advice. In addition, Backblaze, with whom Cloudflare are a Bandwidth Alliance partner, have published their own guide detailing how to use Cloudflare's Web Workers to cache content from B2 private buckets. That is worth reading,

	Solarized
	#FDF6E3,#EEE8D5,#93A1A1,#FDF6E3,#EEE8D5,#657B83,#2AA198,#DC322F

	Solarized Dark
	#073642,#002B36,#B58900,#FDF6E3,#CB4B16,#FDF6E3,#2AA198,#DC322F

	#!/bin/sh -e
	hostname=$1
	device=$2
	file=$HOME/.dynv6.addr6
	[ -e $file ] && old=`cat $file`

	if [ -z "$hostname" -o -z "$token" ]; then
	echo "Usage: token=<your-authentication-token> [netmask=64] $0 your-name.dynv6.net [device]"
	exit 1
	fi

	set nocompatible
	filetype off

	set rtp+=~/.vim/bundle/vundle/
	call vundle#rc()

	" let Vundle manage Vundle
	" required!
	Bundle 'gmarik/vundle'