JRuby on Rails

JRuby on
Rails

fabio.kung@caelum.com.br
Monday, March 2, 2009

http://www.robert-tolksdorf.de/vmlanguages.html


DSLs
Externa
Interna (host)


HAPPY INTERNATIONAL
INVOKEDYNAMIC DAY

JSR-292

http://openjdk.java.net/projects/mlvm/

Mas e por que
Java?

“por que?”

Memória
Heap

objeto

objeto
objeto

objeto

objeto
objeto

objeto


95% dos
objetos tem vida
curta


Mortalidade Infantil
Memória Heap

Eden Tenured


Memória Heap

Eden Tenured

objeto

objeto

objeto
objeto


Memória Heap

Eden Tenured

objeto

objeto
objeto

objeto


Flexibilidade
• Serial
• ParNew
• Parallel Scavenge
• Serial Old
• CMS
• Parallel Old
• G1
http://blogs.sun.com/jonthecollector/entry/our_collectors

Ea
performance?


http://headius.blogspot.com/2008/02/jruby-rc2-released-whats-next.html

JRuby's performance
regularly exceeds Ruby
1.8.6, and in many cases has
started to exceed Ruby 1.9

http://www.ﬂickr.com/photos/diathesis/2115578333/

JIT Compiler


Startup

• -X:bootclasspath
• Nailgun:
http://www.martiansoftware.com/nailgun/


Startup
• -X:bootclasspath
• Nailgun:
http://www.martiansoftware.com/nailgun/

Nailgun
tcp/ip
Client

Nailgun
tcp/ip JVM Server
Client

Nailgun
tcp/ip
Client


Rails não
escala!


http://www.akitaonrails.com/2008/4/19/di-rio-de-bordo-do-ﬁsl-9

Sim! Rails
escala!

http://picasaweb.google.com/leo.torres84/FISL2008

Ruby on Rails

http WebServer Rails
CGI

“como?”

Ruby on Rails

Rails
CGI

http WebServer Rails
CGI

CGI Rails

“como?”

Ruby on Rails

Proxy Reverso
Mongrel
http / http Rails
Load Balancer


Ruby on Rails

Mongrel
http Rails

Proxy Reverso Mongrel
http / http Rails
Load Balancer

Mongrel
http
Rails


JRuby on Rails
container

http Servlet


JRuby on Rails
container

Thread

Thread

Thread
http Servlet

Thread

Thread


JRuby on Rails
container

Thread

Thread

Rails
Thread
http Servlet
(JRuby)

Thread

Thread


JRuby on Rails
container

Rails
Thread
(JRuby)
Thread

Rails
Thread
http Servlet
(JRuby)

Thread

Rails
Thread
(JRuby)


JRuby on Rails
container

Rails
Thread
(JRuby)
Thread

Goldspike Rails
Thread
http Servlet
(JRuby)
http://wiki.jruby.org/wiki/Goldspike
Thread

Rails
Thread
(JRuby)


JRuby Rack

Rails
Thread rack
(JRuby)
Thread
Filter
Rails
Thread
http Servlet rack
JRuby (JRuby)
Rack
Thread

Rails
Thread rack
(JRuby)


JRuby Rack

Rails
Thread rack
(JRuby)
Thread

Merb?
Filter
Rails
Thread
http Servlet rack
JRuby (JRuby)
Rack
http://merbivore.com/
Thread

Rails
Thread rack
(JRuby)


I agree, the
memory situation
is not the best

but compared to
MRI, JRuby deployments are
actually favorable. We're seeing
around 20MB per runtime
in our deployment, ...

http://www.ﬂickr.com/photos/nicksieger

Rails 2.2 is

thread-safe!

http://joshpeek.com/

-server -Xmx1024m

httperf --num-conns 100 --rate 10

class HomeController < ApplicationController
def index
render :text =>
quot;<html>fibonnaci(29) = #{fibonacci(29)}</html>quot;
end

private
def fibonacci(number)
return number if number < 2
fibonacci(number - 1) + fibonacci(number - 2)
end
end


Tomcat
1 runtime, thread-safe: 176 MB
3 runtimes: 200 MB
5 runtimes: 244 MB

Jetty
3 runtimes: 204 MB
5 runtimes: 245 MB

Glassﬁsh
3 runtimes: 370 MB
5 runtimes: 417 MB

jruby -S gem install mongrel
cd railsapp
jruby script/server

Glassﬁsh v3 (gem)
http://wiki.jruby.org/wiki/JRuby_on_Rails_in_GlassFish

jruby -S gem install glassfish
jruby -S glassfish


Warbler
http://wiki.jruby.org/wiki/Warbler

jruby -S gem install warbler
cd railsapp
jruby -S warble


jruby -S gem install jetty-rails
cd railsapp
jruby -S jetty_rails

http://jetty-rails.rubyforge.org/

Eu ouvi dizer
que Jruby é
lento!



guj2: ~20 resp/s



guj3: ~140 resp/s

vs 20 resp/s

“como?”

Cache!


Cache!
container
Rails
(JRuby) Servlet Context

fragmento
fragmento
Rails fragmento
fragmento
(JRuby)
fragmento
fragmento
fragmento
fragmento
Rails
(JRuby)


Conexões ao banco


Mongrel
http Rails

Mongrel
http Rails

/ http Rails
Load Balancer

Mongrel
http Rails

Mongrel
http Rails


Mongrel
http Rails

Mongrel
http Rails

/ http Rails

Pool?
Load Balancer

Mongrel
http Rails

Mongrel
http Rails


JRuby
Connection Pool
Runtime

JRuby
Runtime

JDBC
JRuby
JRuby Rack Adapter
Runtime
Filter (jndi)

JRuby
Runtime

JRuby
Runtime


“” Não importa a tecnologia,


“” Não importa a tecnologia,
desde que você a
conheça muito bem!

http://code.google.com/p/activehibernate/

class Person
include Hibernate
primary_key_accessor :id, :long
h_component :address, [[:street,:string], [:city,:string]]
end


No. Ribs!

class Blog
Ribs! :table => :fox_blog do |r|
r.id.primary_key!
r.title :column => :blog_title
r.body :column => :content_text

r.something.avoid!
end
end


Spring
<beans xmlns=quot;...quot;>
<lang:jruby id=quot;messageServicequot;
script-interfaces=quot;br.com.caelum.Messengerquot;
script-source=quot;classpath:ruby_messenger.rbquot;>
<lang:property name=quot;messagequot; value=quot;Hello World!quot;/>
</lang:jruby>

<bean id=quot;businessLogicquot; class=quot;br.com.caelum.Logicquot;>
<constructor-arg ref=quot;messageServicequot; />
</bean>
</beans>


MagLev


(J)MagLev


Dúvidas?

Obrigado!

fabio.kung@caelum.com.br

JRuby on Rails

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