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

bloudermilk

All of the categories!

I wrote a really simple JavaScript script that uses jQuery to extract all the categories from Facebook's "Create a page" page.

Instructions

1. Navigate to the Create a page page.
2. jQuerify the page.
3. Open up your JavaScript console of choice and run the following script:

mbostock

license: gpl-3.0

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

renatoalbano

# sinatra twitter client with oauth

require 'rubygems'
require 'sinatra'

# use http://github.com/moomerman/twitter_oauth gem
# gem sources -a http://gems.github.com
# gem install moomerman-twitter_oauth
require 'twitter_oauth'