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@hellerbarde
hellerbarde / latency.markdown
Created May 31, 2012 13:16 — forked from jboner/latency.txt
Latency numbers every programmer should know

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

@brandonb927
brandonb927 / osx-for-hackers.sh
Last active March 27, 2024 06:33
OSX for Hackers: Yosemite/El Capitan Edition. This script tries not to be *too* opinionated and any major changes to your system require a prompt. You've been warned.
#!/bin/sh
###
# SOME COMMANDS WILL NOT WORK ON macOS (Sierra or newer)
# For Sierra or newer, see https://github.com/mathiasbynens/dotfiles/blob/master/.macos
###
# Alot of these configs have been taken from the various places
# on the web, most from here
# https://github.com/mathiasbynens/dotfiles/blob/5b3c8418ed42d93af2e647dc9d122f25cc034871/.osx
@gvaughn
gvaughn / copr.md
Last active January 30, 2024 16:11
git copr alias

I'd like to share some git aliases that you might find useful if you handle pull requests from others.

Add these to your ~/.gitconfig in the [alias] section:

copr = "!f() { git fetch -fu origin refs/pull/$1/head:pr-$1; git checkout pr-$1; } ; f"
prunepr = "!git for-each-ref refs/heads/pr-* --format='%(refname:short)' | while read ref ; do git branch -D $ref ; done"

Now you can "git copr #{pr_number}" (check out pull request is the mnemonic) and it will pull down the PR in a local branch of pr-#{pr_number} and check it out for you. To do it right, you must pronounce it "Copper" with a James Cagney gangster accent.

@kevingessner
kevingessner / gist:9509148
Last active April 27, 2023 15:45
Responsive emails that really work -- From Etsy's Code As Craft blog: http://codeascraft.com/2014/03/13/responsive-emails-that-really-work
<html>
<head>
<style type="text/css">
table table {
width: 600px !important;
}
table div + div { /* main content */
width: 65%;
float: left;
}
@tpitale
tpitale / README.md
Last active November 2, 2022 19:59
Sublime Text plugin to create a simple timestamp
  1. Go to Tools > New Plugin
  2. Paste timestamp.py contents and save in User as timestamp.py
  3. Open Preferences > Key Bindings - User (or Default, your call)
  4. Paste keybindings.json, or add a line to your keybindings
  5. Customize the keyboard shortcut to your liking and save
@binaryseed
binaryseed / st4-elixir-lsp.md
Last active May 26, 2021 15:42
ST4 + Elixir LSP
@statico
statico / gist:3172711
Created July 24, 2012 21:15
How to use a PS3 controller on Mac OS X 10.7 (Lion)

How to use a PS3 controller on Mac OS X 10.7 (Lion)

  1. Open Apple menu -> System Preferences -> Bluetooth and disable Bluetooth on Mac as well as any other nearby Macs or devices which will try to pair with and confuse the controller.

  2. Reset PS3 controller by inserting paperclip into pinhole near L2 button.

  3. Connect PS3 controller to Mac with USB cable.

  4. Enable Bluetooth.

@selenamarie
selenamarie / sql that helps.md
Last active February 26, 2019 19:28
@tpitale
tpitale / reel_ws_pg_example.rb
Last active March 23, 2017 13:03
Reel Websocket Server using PG Listen/Notify for crude pubsub
require 'rubygems'
require 'bundler/setup'
require 'reel'
require 'celluloid/io'
require 'pg'
module PGNotifications
def self.included(actor)
actor.send(:include, Celluloid::IO)
end
@solnic
solnic / gist:4999203
Created February 20, 2013 20:19
dm-migrations
dm-do-adapter
dm-yaml-adapter
dm-mysql-adapter
dm-postgres-adapter
dm-sqlite-adapter
dm-sqlserver-adapter
dm-oracle-adapter
dm-rest-adapter
dm-ferret-adapter