Mirah & Dubious Talk Ruby|Web 2010

Extreme Performance
with
Mirah and Dubious

Friday, September 10, 2010

• JRuby on AppEngine
• Mirah
• Dubious
• Hack


JRuby on AppEngine
It rocks, but has some limitations.


Limitations

• Not as supported as Java & Python
• Long spin up times
• Uses more CPU(more expensive)
• getting more performance requires writing
Java


Spin Up

• Rails app instances take a long time to spin
up
• you can’t keep app instances running (yet)


Long Spin Up Times

• Rails instances take 16 seconds or more to
spin up
• AppEngine limits requests to 30 seconds
• Users will hit cold instances


Spin Up Workarounds
DeferredDispather
• Splits Initialization into three requests(two
redirect back)
• runtime & rack
• require app
• dispatch normally


CPU Usage

• On AppEngine CPU == $$$$
• JRuby uses more CPU than Java or Python


JRuby on AppEngine
Optimization

1. Write app in Rails
2. Find parts that are slow/get heavy trafﬁc
3. Rewrite them with Java Servlets


Kinda Sucks, Right?


Enter Mirah & Dubious


Mirah
(Duby)


Mirah - Ruby in Javanese


“Charles Oliver Nutter wanted to create
a language that essentially looked like
Ruby, but was statically typed and
compiled to fast JVM bytecode.
Mirah is the result.”
- mirah.org


Mirah

• Uses Ruby syntax+types
• Behaves like Java
• Extensible through macros


Features From Ruby
• Optional arguments ✓
• Internal iteration ✓
• Closures ✓
• Literals ✓
• String interpolation ✓
• Mixins, “open” classes (soon)

Ruby
def fib(a)
 if a < 2
 a
 else
 fib(a - 1) + fib(a - 2)
 end
end

Mirah
github.com/mirah/mirah/examples/ﬁb.mirah
def fib(a:int)
 if a < 2
 a
 else
 fib(a - 1) + fib(a - 2)
 end
end

Macros


Dubious


Dubious

A Web Framework
in Mirah


High Performance,
Light weight,
Rails like


Written in Mirah, so it’s
as fast as Java.


App Instances Spin Up
in ~1 sec


Few Dependencies


Examples


import dubious.*
import models.*

class ContactsController < ApplicationController

 # GET /contacts
 def index
 @contacts = Contact.all.run
 render index_erb, main_erb
 end

 # GET /contacts/1
 def show
 @contact = Contact.get(params.id)
 render show_erb, main_erb
 end

 # GET /contacts/new
 def new
 @contact = Contact.new
 render new_erb, main_erb
 end

 # GET /contacts/1/edit
 def edit
 @contact = Contact.get(params.id)

import dubious.*
import models.*

class ContactsController < Appli

 # GET /contacts
 def index
 @contacts = Contact.all.run
 render index_erb, main_erb
 end

end

  # GET /contacts/new
  def new
    @contact = Contact.new
    render new_erb, main_erb
  end

  # GET /contacts/1/edit
  def edit
    @contact = Contact.get(param
    render edit_erb, main_erb
  end

end

  # render templates
  def_edb(index_erb,
'views/contacts/index.html.erb')
  def_edb(show_erb,
'views/contacts/show.html.erb')
  def_edb(new_erb,
'views/contacts/new.html.erb')
  def_edb(edit_erb,
'views/contacts/edit.html.erb')
  def_edb(main_erb,
'views/layouts/contacts.html.erb')
end


import com.google.appengine.ext.duby.db.Model
import com.google.appengine.api.datastore.*
import dubious.TimeConversion
import java.util.Date

class Contact < Model
 property :title, String
 property :birthday, Date
 property :url, Link
 property :platform, String
 property :editor, String
 property :summary, Text
 property :address, PostalAddress
 property :phone, PhoneNumber
 property :private, Boolean

 # timestamps
 property :created_at, Date
 property :updated_at, Date
 def before_save
 @updated_at = Date.new
 @created_at = updated_at if @created_at.nil?
 end

 def coerce_date(o:Object)
 TimeConversion.new('jsdate').parse(String(o))
Friday, September 10, 2010 end

<h1>New contact</h1>

<% f = form_for(@contact) %>
 <%= f.start_form %>
 <%= f.error_messages %>
 
 <%= f.label :title %> 
 <%= f.text_field :title %>
 
 
 <%= f.label :summary %> 
 <%= f.text_area :summary %>
 
 
 <%= f.label :birthday %> 
 <%= f.date_select :birthday %>
 
 
 <%= f.label :platform %> 
 <%= f.radio_button :platform, 'Mac' %>Mac
 <%= f.radio_button :platform, 'PC' %>PC
 <%= f.radio_button :platform, 'Linux' %>Linux
 
 
 <%= f.label :editor %> 
 <%= f.select :editor, ['Vim','Emacs','TextMate','Other'

Get Started
Demo Time


Me

Nick Howard

Avid Rubyist
Commiter on Dubious
@baroquebobcat
Work at Gnip in Boulder, CO


Contribute
Mirah & Dubious
mirah.org
Code
github.com/mirah/mirah
github.com/mirah/dubious
Examples
rails-annex.appspot.com
dubious-demo.appspot.com
Mailing List
groups.google.com/group/mirah


Mirah & Dubious Talk Ruby|Web 2010

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