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

jamesu

# Script to automate reserving tickets from amiando. 
# Polls the site using chromedriver, automatically selecting 1 ticket
# and moving to the next step.
#
# Please use responsibly.
#

require 'rubygems'
require "selenium/webdriver"

saimonmoore

set -g prefix C-x
unbind C-b
bind C-x send-prefix

# set -sg escape-time 1
# set -g base-index 1

bind r source-file ~/.tmux.conf; display "Reloaded!"
bind | split-window -h
bind - split-window -v

joshbuddy

For an arbitrary string, detect the largest palindrome* present within it.
* a sequence of characters the same forwards and backwards at least 3 characters long.

For instance in "abbabcdedc", the longest palindrome would be "cdedc".

Answers?

jrochkind

A Capistrano Rails Guide

by Jonathan Rochkind, http://bibwild.wordpress.com

why cap?

Capistrano automates pushing out a new version of your application to a deployment location.

I've been writing and deploying Rails apps for a while, but I avoided using Capistrano until recently. I've got a pretty simple one-host deployment, and even though everyone said Capistrano was great, every time I tried to get started I just got snowed under not being able to figure out exactly what I wanted to do, and figured I wasn't having that much trouble doing it "manually".

croaky

module SingleRecipientSmtp
  def self.included(clazz)
    clazz.class_eval do
      cattr_accessor :single_recipient_smtp_settings
    end
  end

  def perform_delivery_single_recipient_smtp(mail)
    mail.to = single_recipient_smtp_settings[:to]
    mail.cc = nil

jrom

plugin.onMessageInsertion = function (event) {
  var content;
  content = Talker.getLastInsertion().replace(/:[\w_+]+:/g, function (match) {
    var emoji = match,
        filename = (emoji == ':+1:' ? ':plus1:' : emoji).replace(/:/g, '');

    return "<img class=\"emoji\" title=\"" + emoji + "\" alt=\"" + emoji + "\" height=\"20\" width=\"20\" align=\"absmiddle\" src=\"https://teambox.com/assets/emojis/" + filename + ".png\">"
  });
  return content;
};

peternixey

##How Homakov hacked GitHub and the line of code that could have prevented it

---

Please note: THIS ARTICLE IS NOT WRITTEN BY THE GITHUB TEAM or in any way associated with them. It's simply hosted as a Gist because the markdown formatting is excellent and far clearer than anything I could manage on my personal Tumblr at peternixey.com.

If you'd like to follow me on twitter my handle is @peternixey

---

burke

ruby-1.9.3-p327 cumulative performance patch for rbenv

This installs a patched ruby 1.9.3-p327 with various performance improvements and a backported COW-friendly GC, all courtesy of funny-falcon.

Requirements

• rbenv
• ruby-build

You will also need a C Compiler. If you're on Linux, you probably already have one or know how to install one. On OS X, you should install XCode, and brew install autoconf using homebrew.

boriscy

#To install ruby-debug on Ubuntu ruby-1.9.3 you need to download from http://rubyforge.org/frs/?group_id=8883

linecache19-0.5.13.gem 
ruby_core_source-0.1.5.gem 
ruby-debug19-0.11.6.gem 
ruby-debug-base19-0.11.26.gem

#Then in your console

export RVM_SRC=/your/path/to/ruby-1.9.3