Mike Bradshaw bmike

Max Battery Life Checklist

Here is a checklist to follow if you want maximum battery life -- for instance if you're about to get on a long plane flight.

Low power use checklist

With power connected:

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

TL;DR

Pairing an iOS device to a host (computer running iTunes) gives that host significant access to data on the iOS device and requires connecting the unlocked iOS device to a host over USB
Once paired, that host (or another host that has stolen its pairing record) can access significant amounts of user personal data from the iOS device over USB and Wi-Fi through the com.apple.mobile.file_relay and com.apple.mobile.house_arrest lockdown services
These services will not return user data files that are encrypted and locked by iOS Data Protection but the files returned by file_relay are not protected by iOS Data Protection and do include significant amounts of personal user data that would otherwise be encrypted in iTunes encrypted backups ("Encrypt Backup" is enabled)
The com.apple.mobile.file_relay service is not used or referenced by any public Apple software so its intended client software is unknown outside of Apple
Apple released a [Knowledge Base article](https://support.apple.co

	The regex patterns in this gist are intended to match any URLs,
	including "mailto:[email protected]", "x-whatever://foo", etc. For a
	pattern that attempts only to match web URLs (http, https), see:
	https://gist.github.com/gruber/8891611


	# Single-line version of pattern:

	(?i)\b((?:[a-z][\w-]+:(?:/{1,3}\|[a-z0-9%])\|www\d{0,3}[.]\|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+\|\(([^\s()<>]+\|(\([^\s()<>]+\)))\))+(?:\(([^\s()<>]+\|(\([^\s()<>]+\)))\)\|[^\s`!()\[\]{};:'".,<>?«»“”‘’]))

	use strict;
	use warnings;
	use URI::Escape qw(uri_escape_utf8);
	use open IO => ":utf8", # UTF8 by default
	":std"; # Apply to STDIN/STDOUT/STDERR

	my $query = do { local $/; <> };
	$query =~ s/^\s+//g;
	$query =~ s/\s+$//g;

	My iTunes Match Track upgrading and process info:

	If you have less than 25,000 tracks:

	1. First let iTunes Match do its things and find all possible matches in your library and finish uploading any non-matching tracks.
	2. Once its done, make a new Smart Playlist (I made a folder for all my Smart iTunes Match Related Playlists)
	Name this one: iCloud-Upgradeable
	Criteria:
	MATCH ALL:
	Bit Rate is less than 256kbps

	#!/usr/local/bin/macruby

	# Copyright (c) 2009 Matt Aimonetti
	#
	# Permission is hereby granted, free of charge, to any person obtaining a copy
	# of this software and associated documentation files (the "Software"), to deal
	# in the Software without restriction, including without limitation the rights
	# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	# copies of the Software, and to permit persons to whom the Software is
	# furnished to do so, subject to the following conditions:

	#!/bin/sh

	###
	# SOME COMMANDS WILL NOT WORK ON macOS (Sierra or newer)
	# For Sierra or newer, see https://github.com/mathiasbynens/dotfiles/blob/master/.macos
	###

	# Alot of these configs have been taken from the various places
	# on the web, most from here
	# https://github.com/mathiasbynens/dotfiles/blob/5b3c8418ed42d93af2e647dc9d122f25cc034871/.osx

	#!/usr/bin/ruby
	# encoding: utf-8
	#
	# Updated 2017-10-25:
	# - Defaults to large size (512)
	# - If ImageMagick is installed:
	# - rounds the corners (copped from @bradjasper, https://github.com/bradjasper/Download-iTunes-Icon/blob/master/itunesicon.rb)
	# - replace original with rounded version, converting to png if necessary
	#
	# Retrieve an iOS app icon at the highest available resolution

	The regex patterns in this gist are intended only to match web URLs -- http,
	https, and naked domains like "example.com". For a pattern that attempts to
	match all URLs, regardless of protocol, see: https://gist.github.com/gruber/249502


	# Single-line version:

	(?i)\b((?:https?:(?:/{1,3}\|[a-z0-9%])\|[a-z0-9.\-]+[.](?:com\|net\|org\|edu\|gov\|mil\|aero\|asia\|biz\|cat\|coop\|info\|int\|jobs\|mobi\|museum\|name\|post\|pro\|tel\|travel\|xxx\|ac\|ad\|ae\|af\|ag\|ai\|al\|am\|an\|ao\|aq\|ar\|as\|at\|au\|aw\|ax\|az\|ba\|bb\|bd\|be\|bf\|bg\|bh\|bi\|bj\|bm\|bn\|bo\|br\|bs\|bt\|bv\|bw\|by\|bz\|ca\|cc\|cd\|cf\|cg\|ch\|ci\|ck\|cl\|cm\|cn\|co\|cr\|cs\|cu\|cv\|cx\|cy\|cz\|dd\|de\|dj\|dk\|dm\|do\|dz\|ec\|ee\|eg\|eh\|er\|es\|et\|eu\|fi\|fj\|fk\|fm\|fo\|fr\|ga\|gb\|gd\|ge\|gf\|gg\|gh\|gi\|gl\|gm\|gn\|gp\|gq\|gr\|gs\|gt\|gu\|gw\|gy\|hk\|hm\|hn\|hr\|ht\|hu\|id\|ie\|il\|im\|in\|io\|iq\|ir\|is\|it\|je\|jm\|jo\|jp\|ke\|kg\|kh\|ki\|km\|kn\|kp\|kr\|kw\|ky\|kz\|la\|lb\|lc\|li\|lk\|lr\|ls\|lt\|lu\|lv\|ly\|ma\|mc\|md\|me\|mg\|mh\|mk\|ml\|mm\|mn\|mo\|mp\|mq\|mr\|ms\|mt\|mu\|mv\|mw\|mx\|my\|mz\|na\|nc\|ne\|nf\|ng\|ni\|nl\|no\|np\|nr\|nu\|nz\|om\|pa\|pe\|pf\|pg\|ph\|pk\|pl\|pm\|pn\|pr\|ps\|pt\|pw\|py\|qa\|re\|ro\|rs\|ru\|rw\|sa\|sb\|sc\|sd\|se\|sg\|sh\|si\|s