aIex quiterio alex-quiterio

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

Benchmarking Nginx with Go

Today I just wanted to know which of these options is faster:

Go HTTP standalone
Nginx proxy to Go HTTP
Nginx fastcgi to Go TCP FastCGI
Nginx fastcgi to Go Unix Socket FastCGI

Hardware

Security is Hard

Massive Assignment

watch for ActiveRecord Relation, like has_many, has_many :through
watch for user_roles, `group_users
UPDATE action

Admin

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

	#!/usr/bin/env bash
	set -e

	function usage() {
	set -e
	cat <<EOM
	##### ecs-run #####
	Simple script for running tasks on Amazon Elastic Container Service
	One of the following is required:
	Required arguments:

	#!/usr/bin/env ruby
	# A quick and dirty implementation of an HTTP proxy server in Ruby
	# because I did not want to install anything.
	#
	# Copyright (C) 2009-2014 Torsten Becker <torsten.becker@gmail.com>
	#
	# Permission is hereby granted, free of charge, to any person obtaining
	# a copy of this software and associated documentation files (the
	# "Software"), to deal in the Software without restriction, including
	# without limitation the rights to use, copy, modify, merge, publish,

	--- module ScottsSnake where

	import Keyboard
	import Random
	import String
	import Set

	type Position = {x: Int, y: Int }
	type Board = {w: Int, h: Int, wall: [Position]}
	type Apple = Position

	# A simplified version of Ruby's object system, implemented in Ruby. This only
	# supports a subset of Ruby, but is intended to accurately model inheritance
	# and method lookup in as little code as possible, for ease of understanding by
	# Ruby programmers.
	#
	# Classes implemented:
	#
	# * Object
	# * Module < Object
	# * Class < Module