JRuby Jam Session

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JRuby Jam
Charles Nutter & Nick Sieger

@headius @nicksieger

JRuby Overview
JRuby > Ruby + Java

What's 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 Started
Download from jruby.org

Ruby Itself

Ruby Itself
Ruby 1.8.7 and 1.9.2 in the box

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

Ruby Itself
Solid 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 packages
require 'java'

# Pull in some classes
java_import javax.swing.JFrame
java_import javax.swing.JButt...

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)

Invokedynamic
What Java 7 Means for JRuby 1.7

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

def foo
bar
end

def bar
baz foo bar baz
end

def baz
# ...
end

def foo
JRuby on Java 5/6
bar
end

def bar JRuby JRuby
baz foo call ...

def foo
JRuby on Java 7
bar

X X
end

def bar JRuby ...

def foo
JRuby on Java 7
bar
end

def bar
baz foo bar baz
end

...

def foo
JRuby on Java 7
bar
end

def bar
baz foo bar baz
end

def baz
# ....

Benchmarks!
You know you love them.

A “Better” ﬁb bench
bench_ﬁb_complex.rb 5 35

“Richards”
bench_richards.rb 1000000

Red/Black Tree
github.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 AppEng...

torquebox.org/

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

Warbler
Rails in a .war ﬁle

INSTALL gem install warbler

github.com/jruby/warbler

$ cd ~/apps/recordstore

$ cd ~/apps/recordstore

$ warble executable war
rm -f recordstore.war
Creating recordstore.war

$ cd ~/apps/recordstore

$ warble executable war
rm -f recordstore.war
Creating recordstore.war

$ java -jar recordstore.w...

JRuby-Rack
Servlet => Rack conversion layer
Used by Warbler and Trinidad

github.com/jruby/jruby-rack

JRuby-Rack

JRuby-Rack Your
Servlet
servlet Rack Rails/Rack
container ﬁl...

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

JRuby on AppCloud
Dashboard deploy
Add to Gemﬁle
gem 'trinidad'

Command-line deploy
$ gem i...

Tuning
Your application is special

JVM server compiler
Always run with --server

conﬁg.threadsafe!
1 runtime > pooled runtimes

Trinidad Warbler
trinidad --threadsaf...

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

HTTP connection thread pool

# of open ﬁles limit

JVM max heap size (-Xmx___m)

JVM GC -XX:+UseConcMarkSweepGC -XX:+Use...

Performance
JRuby vs. Passenger

Static Benchmark

EY AppCloud c1.medium

github.com/
nicksieger/redmine
...

Request/reply scaling curve
90

80
jruby ...

Request/reply scaling curve
90

80
jruby ...

Passenger

JRuby

Catastrophic failure

Previous page
(no longer visible)

Passenger Memory

JRuby Memory

Performance
Takeaways

Speed-competitive
Will require warm-up
Faster with newer versions of Java

Memory efﬁcient
at higher throughput
Threads lighter than processes

May need tuning
Guidelines and JVM tools
will help pinpoint conﬁguration

JRuby T-Shirts!

Try JRuby on Engine Yard Cloud Today

500 compute hours for free

Full-featured production ready
environment

Start an...

Engine Yard @ JavaOne!
Stop by our exhibition
booth

JRuby team ofﬁce hours

Talks by JRuby team

Talk by Mike Piech ...

Q&A
We must have missed something

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