andhapp

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 127.0.0.1 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)

andhapp

[james@kremlin00 ruby (klasscache)]$./ruby  -I . -I lib ./test.rb 
method cache invalidations: 18
A
B
method cache invalidations: 18

andhapp

/*

* more helpful links
* http://www.w3.org/TR/CSS2/generate.html#scope
* http://quirksmode.org/css/css2/counter.html
* http://www.impressivewebs.com/css-counter-increment/

*/

/* decimal counters (basic, default) */

andhapp

#!/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

andhapp

module CheapStrings
  def `(str)
    str
  end
end

module A
  extend CheapStrings

  def self.make_lots_of_strings

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.

andhapp

class Foo
  public def my_public_method
    1 + 2
  end

  protected def my_protected_method
    3 + 4
  end

  private def my_private_method

andhapp

This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient)


Server Software:        SimpleHTTP/0.6
Server Hostname:        127.0.0.1
Server Port:            5000

andhapp

#!/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 Torsten Becker <torsten.becker@gmail.com>

require 'socket'
require 'uri'

andhapp

TracePoint:
	disable                        1
	enable                         1

Object:
	require                        1983
	load_dependency                485
	[]                             18
	hash                           15
	initialize                     6