hellerbarde

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

soarez

How to setup your own CA with OpenSSL

For educational reasons I've decided to create my own CA. Here is what I learned.

First things first

Lets get some context first.

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:

dnagir

# RSpec 2.0 syntax Cheet Sheet by http://ApproachE.com

# defining spec within a module will automatically pick Player::MovieList as a 'subject' (see below)
module Player
	describe MovieList, "with optional description" do
		  
	  it "is pending example, so that you can write ones quickly"
	  
	  it "is already working example that we want to suspend from failing temporarily" do
		pending("working on another feature that temporarily breaks this one")

kujohn

Port Forwarding in Mavericks

---

Since Mavericks stopped using the deprecated ipfw (as of Mountain Lion), we'll be using pf to allow port forwarding.

####1. anchor file Create an anchor file under /etc/pf.anchors/<anchor file> with your redirection rule like:

lucasfais

Sublime Text 2 – Useful Shortcuts (Mac OS X)

General

⌘T	go to file
⌘⌃P	go to project
⌘R	go to methods
⌃G	go to line
⌘KB	toggle side bar
⌘⇧P	command prompt

chriseppstein

Sass/Less Comparison

In this document I am using Sass's SCSS syntax. You can choose to use the indented syntax in sass, if you prefer it, it has no functional differences from the SCSS syntax.

For Less, I'm using the JavaScript version because this is what they suggest on the website. The ruby version may be different.

Variables

dansimpson

pre.code { background: #181818; padding: 16px; color: #F8F8F8; font-family: Consolas, Monaco,"Lucida Console"; }
pre.code * { font-family: Consolas, Monaco,"Lucida Console"; }
pre.code .hll { background-color: #ffffcc }
pre.code .c { color: #5F5A60; font-style: italic } /* Comment */
pre.code .err { border:#B22518; } /* Error */
pre.code .k { color: #CDA869 } /* Keyword */
pre.code .cm { color: #5F5A60; font-style: italic } /* Comment.Multiline */
pre.code .cp { color: #5F5A60 } /* Comment.Preproc */
pre.code .c1 { color: #5F5A60; font-style: italic } /* Comment.Single */
pre.code .cs { color: #5F5A60; font-style: italic } /* Comment.Special */

oubiwann

$ git clone https://gist.github.com/8b4404e538e61c7996a5.git
$ cd 8b4404e538e61c7996a5
$ mkdir salamander && cd salamander
$ curl -L -O https://archive.org/download/SalamanderDrumkit/salamanderDrumkit.tar.bz2
$ curl -L -O https://github.com/johnsen/drumsandpercussion/blob/master/SalamanderKick/salamanderdrum-kick-r1.tar.gz
$ curl -L -O http://freepats.zenvoid.org/Piano/SalamanderGrandPianoV3_44.1khz16bit.tar.bz2
$ tar xvfz salamanderDrumkit.tar.bz2
$ tar xvfz salamanderdrum-kick-r1.tar.gz
$ mv Kick/kick* OH/
$ tar xvfz SalamanderGrandPianoV3_44.1khz16bit.tar.bz2

rklemme

require 'yaml'

Track = Struct.new :title, :duration

# An Album represents an audio medium which has title,
# interpret, a pause duration between tracks and a list
# of individual tracks.
class Album
  attr_reader :title, :interpret, :pause