Anuj Dutta andhapp


This is a proof-of-concept of a couple of concurrent data structures written in Ruby.

The implementations are heavily commented for those interested. There are benchmarks (with results) included below. The results are interesting, but, as always, take with a grain of salt.

Data structures

AtomicLinkedQueue is a lock-free queue, built on atomic CAS operations.

View cheap_strings.rb
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module CheapStrings
def `(str)
module A
extend CheapStrings
def self.make_lots_of_strings
View dead_constants.rb
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#!/usr/bin/env ruby
gem "parser", "~> 1.4"
require "parser"
require "parser/ruby19"
require "set"
class ConstantDeclarationAndUseProcessor < Parser::AST::Processor
attr_reader :declared, :used
def initialize
View counters.css
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* more helpful links
/* decimal counters (basic, default) */
View output
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[james@kremlin00 ruby (klasscache)]$./ruby -I . -I lib ./test.rb
method cache invalidations: 18
method cache invalidations: 18
View Instrument Anything in Rails

Instrument Anything in Rails 3

With Rails 3.0 released a few weeks ago I've migrated a few apps and I'm constantly finding useful new improvements. One such improvement is the ability to log anything in the same way that Rails internally logs ActiveRecord and ActionView. By default Rails 3 logs look slightly spiffier than those produced by Rails 2.3: (notice the second line has been cleaned up)

Started GET "/" for at Mon Sep 06 01:07:11 -0400 2010
  Processing by HomeController#index as HTML
  User Load (0.2ms)  SELECT `users`.* FROM `users` WHERE (`users`.`id` = 3) LIMIT 1
  CACHE (0.0ms)  SELECT `users`.* FROM `users` WHERE (`users`.`id` = 3) LIMIT 1
Rendered layouts/_nav.html.erb (363.4ms)
View Ruby Notepad Bookmarklet
data:text/html, <style type="text/css">#e{position:absolute;top:0;right:0;bottom:0;left:0;}</style><div id="e"></div><script src="" type="text/javascript" charset="utf-8"></script><script>var e=ace.edit("e");e.setTheme("ace/theme/monokai");e.getSession().setMode("ace/mode/ruby");</script>
View gist:4560641

Researchers investigating the Rails parameter parsing vulnerability discovered that the same or similar vulnerable code had made its way into multiple other libraries. If your application uses these libraries to process untrusted data, it may still be vulnerable even if you have upgraded Rails. Check your Gemfile and Gemfile.lock for vulnerable versions of the following libraries.

Directly vulnerable libraries


Vulnerable: <= 3.2.10, <= 3.1.9, <= 3.0.18, <= 2.3.14

Fixed: 3.2.11, 3.1.10, 3.0.19, 2.3.15



Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
    fetch = +refs/heads/*:refs/remotes/origin/*
    url =

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

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$ cd /usr/src
$ wget
$ tar xzvf ./nginx-0.8.52.tar.gz
$ rm ./nginx-0.8.52.tar.gz
$ gem install s3sync capistrano capistrano-ext passenger --no-ri --no-rdoc
$ passenger-install-nginx-module
# Automatically download and install Nginx? 2. No: I want to customize my Nginx installation
# Where is your Nginx source code located?: /usr/src/nginx-0.8.52
# Where do you want to install Nginx to?: /opt/nginx
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