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

metaskills

# WAIT! Do consider that `wait` may not be needed. This article describes
# that reasoning. Please read it and make informed decisions.
# https://www.varvet.com/blog/why-wait_until-was-removed-from-capybara/

# Have you ever had to sleep() in Capybara-WebKit to wait for AJAX and/or CSS animations?

describe 'Modal' do
  
  should 'display login errors' do
    visit root_path

andreyvit

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

candlerb

If someone asked me the question "what layout should I use for my Go code repository?", I'd start by asking back "what are you building: an executable, or a library?"

Single executable

Stage 1: single source file

Create a directory named however you want your final executable to be called (e.g. "mycommand"), change into that directory, and create the following files:

aemkei

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE

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

---

fnichol

A Common .ruby-version File For Ruby Projects

Background

I've been using this technique in most of my Ruby projects lately where Ruby versions are required:

• Create .rbenv-version containing the target Ruby using a definition name defined in ruby-build (example below). These strings are a proper subset of RVM Ruby string names so far...
• Create .rvmrc (with rvm --create --rvmrc "1.9.3@myapp") and edit the environment_id= line to fetch the Ruby version from .rbenv-version (example below).

Today I learned about another Ruby manager, rbfu, where the author is using a similar technique with .rbfu-version.

zhengjia

=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')

bugyt

ArchLinux Cheat Sheet

Network configuration

• List network devices

    # ip link
  

• Enabling and disabling network interfaces

    # ip link set <network interface> up
  

ip link set down

bwiggs

global
  #debug                                   # uncomment to enable debug mode for HAProxy

defaults
  mode http                                # enable http mode which gives of layer 7 filtering
  timeout connect 5000ms                   # max time to wait for a connection attempt to a server to succeed
  timeout client 50000ms                   # max inactivity time on the client side
  timeout server 50000ms                   # max inactivity time on the server side

backend legacy                             # define a group of backend servers to handle legacy requests