jboner

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

dergachev

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

tskaggs

Convert MOV to GIF using FFmpeg and ImageMagick

I tried a few different techniques to make a GIF via command-line and the following gives me the best control of quality and size. Once you're all setup, you'll be pumping out GIFs in no time!

Preparation

Install FFmpeg

• $ brew install ffmpeg [all your options]
  • Example: $ brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-frei0r --with-libass --with-libvo-aacenc --with-libvorbis --with-libvpx --with-opencore-amr --with-openjpeg --with-opus --with-rtmpdump --with-schroedinger --with-speex --with-theora --with-tools

Install ImageMagick

Stanback

#
# CORS header support
#
# One way to use this is by placing it into a file called "cors_support"
# under your Nginx configuration directory and placing the following
# statement inside your **location** block(s):
#
#   include cors_support;
#
# As of Nginx 1.7.5, add_header supports an "always" parameter which

rolftimmermans

#target photoshop

/* Open the given file, and compress with TinyPNG. */
function compressFile(file) {
  var document = open(file);

  if (document.mode == DocumentMode.INDEXEDCOLOR) {
    document.changeMode(ChangeMode.RGB);
  }

tristanbes

# If you open your Ressource monitoring under OSX, you'll see that the
# Process "Spotify Helper" is eating between 20% and 30% of CPU constantly
# It means that when you're on battery, it'll drain it faster.

# To prevent the Spotify Helper (which are basically ads for spotify) from spawning process, 
# you should disable access to the app doing this (close Spotify first) :

sudo chmod 000 "/Applications/Spotify.app/Contents/Frameworks/Spotify Helper EH.app"
sudo chmod -N "/Applications/Spotify.app/Contents/Frameworks/Spotify Helper EH.app"

bitops

module Foo
  def self.included(base)
    base.extend(ClassMethods)
  end
  
  module ClassMethods
    def bar
      puts 'class method'
    end
  end

benlinton

Multiple MySQL Versions for Development

Options included below:

• Using Docker docker-compose
• Using Homebrew brew

Using Docker (recommended)

This gist was originally created for Homebrew before the rise of Docker, yet it may be best to avoid installing mysql via brew any longer. Instead consider adding a barebones docker-compose.yml for each project and run docker-compose up to start each project's mysql service.

nbouvrette

/**
 * Stand alone polyfill allow only numbers on input of type number.
 *
 * While input filtering is already supported by default by some browsers, maximum length has not been implemented by
 * any. This script will solve both issue and make sure that only digits can be entered in input elements of type
 * number. If the optional attribute `max` is set, it will calculate it's length and mimic the `maxlength` behavior on
 * input of type text.
 *
 * Supports:
 *

RangerDane

# nonsense.rb
# a markov chain of varying depth
# USAGE: make a new nonsense tree, add lines, then chain!
# > non = Nonsense.new 2
# > non.add_line "What is happening"
# > non.add_line "The world is on fire"
# > non.chain
# => "What won hat woren ire worenis hape"

class Nonsense