Phil Cohen phlipper

Back in Melbourne circa 2010/11, Jodie, Jared and I used to run a [monthly vegan mentoring group][vegan-month]. I have gone back through the mailing lists and collected much of the curriculum and information from the program into this single document, so that I can distribute it more widely. The program was designed not just to get you through the first month nutritionally, but to expose you to a variety of foods and ideas that may be new to you. It emphasises that veganism is a shift sideways, not a sacrifice.

Commit Often, Perfect Later, Publish Once: Git Best Practices

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WAL-E needs to be installed on all machines, masters and slaves.

How to install WAL-E

Only one machine, the master, writes WAL segments via continuous archiving. The configuration for the master postgresql.conf is:

archive_mode = on
archive_command = 'envdir /etc/wal-e.d/env wal-e wal-push %p'
archive_timeout = 60

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

	# bash completion for rake
	#
	# some code from on Jonathan Palardy's http://technotales.wordpress.com/2009/09/18/rake-completion-cache/
	# and http://pastie.org/217324 found http://ragonrails.com/post/38905212/rake-bash-completion-ftw
	#
	# For details and discussion
	# http://turadg.aleahmad.net/2011/02/bash-completion-for-rake-tasks/
	#
	# INSTALL
	#

	#!/usr/bin/env ruby

	#
	# Passenger management script
	# By James Smith http://loopj.com
	# Based heavily on a similar script by Jon Bettcher
	#
	# Check memory usage of all paseenger child process and kill if grows
	# too large.
	#

	# ~/.tmux.conf
	#
	# See the following files:
	#
	# /opt/local/share/doc/tmux/t-williams.conf
	# /opt/local/share/doc/tmux/screen-keys.conf
	# /opt/local/share/doc/tmux/vim-keys.conf
	#
	# URLs to read:
	#

	# .railsrc for Rails 3, encoding: utf-8
	# see http://rbjl.net/49-railsrc-rails-console-snippets

	if !Rails.application then warn "Rails isn't loaded, yet... skipping .railsrc" else
	# # #

	def ripl?; defined?(Ripl) && Ripl.instance_variable_get(:@shell); end

	# # #
	# loggers

	#!/usr/bin/env ruby
	# vim: set syntax=ruby

	# Ensures that changes to the Rails schema.rb file may only be committed if a
	# migration file is also committed at the same time.

	def schema_modified?
	%x[ git diff --cached \|grep schema.rb ] == ''
	end