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A pseudonymous trust system for a decentralized anonymous marketplace

Dionysis Zindros, National Technical University of Athens dionyziz@gmail.com

Keywords

pseudonymous anonymous web-of-trust identity trust bitcoin namecoin proof-of-burn timelock decentralized anonymous marketplace openbazaar

Abstract

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

ruby-1.9.3-p385 cumulative performance patch for rbenv

This installs a patched ruby 1.9.3-p385 with various performance improvements and a backported COW-friendly GC, all courtesy of funny-falcon.

Requirements

You will also need a C Compiler. If you're on Linux, you probably already have one or know how to install one. On OS X, you should install XCode, and brew install autoconf using homebrew.

ruby-1.9.3-p484 cumulative performance patch for rbenv

This installs a patched ruby 1.9.3-p484 with the railsexpress patchsets: https://github.com/skaes/rvm-patchsets

Requirements

You will also need a C Compiler. If you're on Linux, you probably already have one or know how to install one. On OS X, you should install XCode, and brew install autoconf using homebrew.

	Ruby 2.1.0 in Production: known bugs and patches

	Last week, we upgraded the github.com rails app to ruby 2.1.0 in production.
	While testing the new build for rollout, we ran into a number of bugs. Most of
	these have been fixed on trunk already, but I've documented them below to help
	anyone else who might be testing ruby 2.1 in production.

	@naruse I think we should backport these patches to the ruby_2_1 branch and
	release 2.1.1 sooner rather than later, as some of the bugs are quite critical.
	I'm happy to offer any assistance I can to expedite this process.

	group :production do
	gem 'unicorn'

	# Enable gzip compression on heroku, but don't compress images.
	gem 'heroku-deflater'

	# Heroku injects it if it's not in there already
	gem 'rails_12factor'
	end

	# Thee will be more information here when I share the entire problem space I'm working on, but
	# in short, this is preview material for my second talk in a series called "What Computer Scientists Know".
	# The first talk is on recursion, and goes through several examples., leading up to a problem based
	# on a simple puzzle that initial estimates based on performance of a previous puzzle would take years
	# to solve on modern computers with the techniques shown in Ruby. That sets the stage for improving the
	# performance of that problem with threading, concurrency, and related tuning.
	#
	# The second talk is on threading and concurrency, touching on algorithmic performance as well.
	# Using some knowledge of the problem (board symmetry, illegal moves, etc), we reduce the problem space
	# to about .5% of what we initially thought it was. Still, the initial single threaded solution took more

	# unicorn

	description "unicorn ruby app server"

	start on (local-filesystems and net-device-up IFACE=lo and runlevel [2345])
	stop on runlevel [!2345]

	env WORKDIR=/data
	env PIDFILE=/data/tmp/pids/unicorn.pid
	env CFGFILE=/data/config/unicorn.rb

	test:
	override:
	- bundle exec rspec spec

	deployment:
	acceptance:
	branch: master
	commands:
	- ./script/heroku_deploy.sh <ACCEPTANCE_HEROKU_APP>:
	timeout: 300

	#!/bin/sh
	filename=$1
	echo "Begin processing file:" $filename

	dimensions=$(identify -format '%w %h' $filename)

	IFS=' ' read -a array <<< "$dimensions"
	width=${array[0]}
	height=${array[1]}