Andy Huang iandyh

#Mobile Device Detection via User Agent RegEx

Yes, it is nearly 2012 and this exercise has been done to death in every imaginable language. For my own purposes I needed to get the majority of non-desktop devices on to a trimmed down, mobile optimized version of a site. I decided to try and chase down an up-to-date RegEx of the simplest thing that could possibly work.

I arrived at my current solution after analyzing 12 months of traffic over 30+ US based entertainment properties (5.8M+ visitors) from Jan - Dec 2011.

The numbers solidified my thoughts on the irrelevancy of including browsers/OSes such as Nokia, Samsung, Maemo, Symbian, Ipaq, Avant, Zino, Bolt, Iris, etc. The brass tacks of the matter is that you certainly could support these obscure beasts, but are you really going to test your site on them? Heck, could you even find one?! Unless the folks that pay you are die hard Treo users my guess is "No".

Interestingly enough my research shows that /Mobile/ is more efficient than **/iP(

Internet Scale Services Checklist

A checklist for designing and developing internet scale services, inspired by James Hamilton's 2007 paper "On Desgining and Deploying Internet-Scale Services."

http://mvdirona.com/jrh/talksandpapers/jamesrh_lisa.pdf

Basic tenets

Does the design expect failures to happen regularly and handle them gracefully?
Have we kept things as simple as possible?

Configuring Boot2Docker to use NFS on an OSX based machine

To improve the speed of Boot2Docker drastically, you will want to set it up to use NFS.
You will need to do the following once on your host machine:
- Add this to /etc/exports on your mac
```
# BOOT2-DOCKER-BEGIN
/Users 192.168.59.103 -alldirs -mapall=501:20
# BOOT2-DOCKER-END
```

	package main

	import (
	"bytes"
	"encoding/hex"
	"flag"
	"fmt"
	"io"
	"log"
	"net"

	function Gauge(placeholderName, configuration)
	{
	this.placeholderName = placeholderName;

	var self = this; // for internal d3 functions

	this.configure = function(configuration)
	{
	this.config = configuration;

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	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 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	#!/usr/bin/python -tt
	#
	import datetime
	import json
	import logging
	import logging.handlers
	import optparse
	import os
	import re
	import shutil

	#!/bin/bash

	#
	# This script will mount /Users in the boot2docker VM using NFS (instead of the
	# default vboxsf). It's probably not a good idea to run it while there are
	# Docker containers running in boot2docker.
	#
	# Usage: sudo ./boot2docker-use-nfs.sh
	#

	#!/usr/bin/env ruby

	# Usage
	# $ docker-machine create my-machine123 -d virtualbox
	# $ ruby <(curl -L https://git.io/vvvco) my-machine123
	# https://gist.github.com/mattes/4d7f435d759ca2581347

	require 'erb'

	bootlocalsh = %Q(#/bin/bash

	#!/bin/bash
	if [[ -z $(grep dockerhost /etc/hosts) ]]
	then
	echo `/sbin/ip route\|awk '/default/ { print $3 }'` dockerhost >> /etc/hosts
	fi