JRuby Jam Session

JRuby JamCharles Nutter & Nick Sieger@headius @nicksieger

JRuby Overview JRuby > Ruby + Java

Whats Different?

The Bad

Memory Footprint

Memory Footprint Base memory size is larger(Footprint over time is smaller)

Memory Footprint Objects are larger(But instance var table is smaller)

Missing or Disabled Features

Missing or Disabled Features No Kernel#fork

Missing or Disabled Features No continuations (callcc) (except for speciﬁc forms)

Missing or Disabled Features ObjectSpace off by default (-X+O to enable)

Missing or Disabled Features set_trace_func off by default (--debug to enable)

C Extensions Shipped in JRuby 1.6,still considered experimental

The Good

Getting Started Install a JVM (depends on your OS)

Getting Started rvm install jruby

Getting StartedDownload from jruby.org

Ruby Itself

Ruby ItselfRuby 1.8.7 and 1.9.2 in the box

Ruby Itself Multi-VM support(many apps in one process)

Ruby ItselfSolid across platforms

Ruby Itself Solid across platforms(Best Ruby on Windows?)

Ruby Itself Solid across platforms(Best Ruby on OpenVMS?)

Ruby Itself Solid across platforms(Best Ruby on zLinux?)

Java Virtual Machine (JVM)

Java Virtual Machine (JVM) Java libraries like Swing (or Scala, Groovy, Clojure, etc)

# Import Java packagesrequire java# Pull in some classesjava_import javax.swing.JFramejava_import javax.swing.JButton# create frame and buttonframe = JFrame.new("Hello Swing")button = JButton.new("Klick Me!")button.add_action_listener do button.text = "You klicked!"end# Add the button to the frameframe.content_pane.add(button)# Show frameframe.default_close_operation =JFrame::EXIT_ON_CLOSEframe.packframe.visible = true

Java Virtual Machine (JVM) Tools like VisualVM

Java Virtual Machine (JVM) Concurrent threading

Java Virtual Machine (JVM) Best garbage collectors

Java Virtual Machine (JVM) Optimizing JIT compiler

Java Virtual Machine (JVM) New dynamic dispatch support (invokedynamic)

InvokedynamicWhat Java 7 Means for JRuby 1.7

Ruby = Method Calls Lots and lots and lots and lots...

def foo barenddef bar baz foo bar bazenddef baz # ...end

def foo JRuby on Java 5/6 barenddef bar JRuby JRuby baz foo call bar call bazend logic logicdef baz # ...end Kills many JVM optimizations

def foo JRuby on Java 7 bar X Xenddef bar JRuby JRuby baz foo call bar call bazend logic logicdef baz # ...end Dynamic call logic built into JVM

def foo JRuby on Java 7 barenddef bar baz foo bar bazenddef baz # ...end Straight through dispatch path

def foo JRuby on Java 7 barenddef bar baz foo bar bazenddef baz # ...end Optimizations (like inlining) can happen!

Benchmarks!You know you love them.

A “Better” ﬁb bench bench_ﬁb_complex.rb 5 35

“Richards”bench_richards.rb 1000000

Red/Black Treegithub.com/headius/redblack

Wait for it... Benchmarks are benchmarks.If you don’t like them, give us yours!

Deployment

Ruby servers WAR ﬁles Cloud WEBrick GlassFish EY AppCloud Trinidad Tomcat AppEngine TorqueBox JBoss AWS EB http://ey.io/webservers

torquebox.org/$ torquebox deploy ~/src/sinatra/basic$ torquebox run

Warbler Rails in a .war ﬁle INSTALL gem install warblergithub.com/jruby/warbler

$ cd ~/apps/recordstore

$ cd ~/apps/recordstore$ warble executable warrm -f recordstore.warCreating recordstore.war

$ cd ~/apps/recordstore$ warble executable warrm -f recordstore.warCreating recordstore.war$ java -jar recordstore.war<server starts on port 8080>

JRuby-RackServlet => Rack conversion layer Used by Warbler and Trinidad github.com/jruby/jruby-rack

JRuby-Rack JRuby-Rack Your Servlet servlet Rack Rails/Rackcontainer ﬁlter app

JRuby on AppCloud EYSD, JRuby 1.6.x, Trinidaddocs.engineyard.com/appcloud-tech-stack.html

JRuby on AppCloud Dashboard deployAdd to Gemﬁlegem trinidadCommand-line deploy$ gem install engineyard$ cd ~/apps/recordstore$ ey deploy

TuningYour application is special

JVM server compiler Always run with --server

conﬁg.threadsafe! 1 runtime > pooled runtimes Trinidad Warblertrinidad --threadsafe config.webxml.jruby.max.runtimes = 1

Database pool default is 5threadsafe needs more connections database.yml production: adapter: mysql pool: 200

HTTP connection thread pool# of open ﬁles limitJVM max heap size (-Xmx___m)JVM GC -XX:+UseConcMarkSweepGC -XX:+UseG1GC

PerformanceJRuby vs. Passenger

Static Benchmark EY AppCloud c1.medium github.com/ nicksieger/redmine MySQL Passenger 3 JRuby 1.6.4 REE 2011.03 Trinidad 1.2.1

Request/reply scaling curve 90 80 jruby reply rate 70 passenger reply rateRequests per second 60 50 40 30 20 10 0 10 20 30 40 50 60 70 80 90 Replies per second

Request/reply scaling curve 90 80 jruby reply rate 70 passenger reply rateRequests per second PS 60 50 OO did I mention 40 JRuby’s in 30 beta? 20 10 0 10 20 30 40 50 60 70 80 90 Replies per second

Passenger

Catastrophic failure Previous page (no longer visible)

Passenger Memory

JRuby Memory

Performance Takeaways

Speed-competitive Will require warm-upFaster with newer versions of Java

Memory efﬁcient at higher throughputThreads lighter than processes

May need tuning Guidelines and JVM toolswill help pinpoint conﬁguration

JRuby T-Shirts!

Try JRuby on Engine Yard Cloud Today 500 compute hours for free Full-featured production ready environment Start and stop your environment as needed No credit card required and completely risk free

Engine Yard @ JavaOne! Stop by our exhibition booth JRuby team ofﬁce hours Talks by JRuby team Talk by Mike Piech and Jacob Lehrbaum on the value of PaaS

Q&AWe must have missed something

http://teamco-anthill.blogspot.com	33
http://ontwik.com	21
http://www.hanrss.com	3

JRuby Jam Session

by Engine Yard on Sep 22, 2011

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JRuby Jam Session — Presentation Transcript