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

nixme

# Quick and dirty script to read unique IDs from NFC tags using the ACR122U USB
# reader.
#
# PC/SC-based API details for the ACR122U available at
# http://acs.com.hk/drivers/eng/API_ACR122U_v2.01.pdf
#
# Assumes ruby >= 1.9.2
# `gem install smartcard` first
#

jlong

var parser = document.createElement('a');
parser.href = "http://example.com:3000/pathname/?search=test#hash";

parser.protocol; // => "http:"
parser.hostname; // => "example.com"
parser.port;     // => "3000"
parser.pathname; // => "/pathname/"
parser.search;   // => "?search=test"
parser.hash;     // => "#hash"
parser.host;     // => "example.com:3000"

jashkenas

  # In development mode, optionally perform a RubyProf profile of any request.
  # Simply pass perform_profile=true in your params.
  def perform_profile
    return yield unless params[:perform_profile]
    require 'ruby-prof'
    RubyProf.start
    yield
    result = RubyProf.stop
    printer = RubyProf::FlatPrinter.new(result)
    File.open("#{Rails.root}/tmp/profile.txt", 'w+') do |f|

them0nk

#Model 

@user.should have(1).error_on(:username) # Checks whether there is an error in username 
@user.errors[:username].should include("can't be blank")  # check for the error message 

#Rendering
response.should render_template(:index)

#Redirecting 
response.should redirect_to(movies_path)

coreyhaines

--colour
-I app

anthonyshort

// Media Queries in Sass 3.2
//
// These mixins make media queries a breeze with Sass.
// The media queries from mobile up until desktop all 
// trigger at different points along the way
//
// And important point to remember is that and width
// over the portrait width is considered to be part of the
// landscape width. This allows us to capture widths of devices
// that might not fit the dimensions exactly. This means the break

ahoward

### blogged @ http://dojo4.com/blog/easy-cheasy-realtime-log-tailing-in-a-rails-admin-view



### the su controller action


  def logs
    log = File.join(Rails.root, "log", "#{ Rails.env }.log")
    @lines = `tail -1024 #{ log }`.split(/\n/).reverse

asmuth

namespace :tlnt do

  desc "deploy to staging environment"
  task :deploy_staging => :environment do
    deploy_to_environment(:staging)
  end

  desc "restart staging environment"
  task :restart_staging => :environment do
    restart_environment(:staging)

assaf

# Run command(s) over SSH
run() {
  ssh deploy@${HOST} -t $* || exit 1
}

# Transfer all the specified files/directories to working directory
upload() {
  tar czf - $* | ssh deploy@${HOST} tar xzf - -C /etc/chef || exit 1
}