The Story of JRuby - Speaker Deck

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The Story of JRuby Charles Oliver Nutter @headius

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Hello Euruko! • Charles Oliver Nutter (@headius) • My ﬁrst time to Budapest! • My last Euruko was in Amsterdam! • JRuby co-lead employed by Red Hat

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Once upon a time...

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24 February, 1993

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Andy Hunt Dave Thomas

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Jan Arne Petersen

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The Beginning • Basic parser based on MRI's parse.y • Pieces of core classes • Beginning of an interpreter • License, readme, etc

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Two Busy Years • 0.2.0 through 0.3.0 during 2001 • 1.6_0.3.1 through 1.6_0.5.3 in 2002 • Basic Ruby 1.6 code starting to run • Early Java integration

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And then...two quiet years

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YARV Rake Rubygems

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Eleven Exciting Years! • Hundreds of contributors • Thousands of issues reported and ﬁxed • Tens of thousands of commits • Thank you to Red Hat, Engine Yard, and Sun Microsystems

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JRuby is Ruby • JRuby 9.1.x compatible with Ruby 2.3 • 98% of language specs • 94% of core class specs • JRuby 9.2 (master) compatible with Ruby 2.4 • Features mostly complete • Working on next-gen optimizations

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Native Extensions • Almost all popular native libraries have JRuby support • Full support for calling C libraries through FFI • Rich, fast integration with Java libraries

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Rails • Rails 5 works today, mostly • ActiveRecord is very spotty • Lots of changes over the years • Lag in updating our adapters • Actively being improved right now • Goal is 100% passing Rails tests

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New Adapters • New sqlite3 adapter: 75% shared code from Rails • We expect similar ratio for mysql, pgsql • No version checks; support for one Rails version at a time • w.x.y.z: w.x will match Rails, y.z will be our versioning+security • Working with Rails to increase amount of shared code • Ideally, our extra code could just go in rails/rails

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Overall: 99.57% ActiveSupport: 99.42% ActiveRecord: 99.66%

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Deploying JRuby • Ruby-style • We recommend puma or torquebox for the server; see also ratpack • Most deployers work (capistrano, etc) • Warbler, torquebox, and other tools for all-in-one executable jar • Java-style • Torquebox for full-stack env (messaging, scheduling, clustering and more in the box) • Warbler for existing Java servers • Full set of Maven utilities for heterogeneous apps

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Deploying with JRuby 9k Joe Kutner (@codeﬁnger)

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JRuby is a JVM Language • Fast, precise, concurrent garbage collection • Optimizing native JIT • Parallel threading • All the libraries the JVM has to offer

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JVM Tooling • Wide range of GCs: parallel, concurrent, realtime, pauseless • Built-in tools for analyzing GC, JIT, thread, IO, heap • Built-in remote monitoring via JMX • Dozens of tools out there for proﬁling, management, and more

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VisualVM • Graphical console into your application • Monitor GC, threads, CPU usage • Sampled or full proﬁling with GUI browser • Live memory dumping, heap inspection • Ships with every OpenJDK install

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JVM Tools

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Optimizing Ruby • Run code through our proﬁling interpreter • JIT compile to JVM bytecode • Use invokedynamic to make dynamic calls fast • Optimize Ruby before sending it to bytecode • Start utilizing new Graal JVM JIT

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High Performance 0 2.5 5 7.5 10 blocks + loops benchmark, times faster than MRI 2.4.0 9.18x 8.29x 5.48x 1.34x 1.25x JRuby+JIT JRuby+JIT+indy JRuby+JIT+inline JRuby+JIT+inline+indy JRuby+JIT+inline+indy+Graal 0 7.5 15 22.5 30 mandelbrot generator, times faster than MRI 2.4.0 23.33x 2.91x JRuby+JIT+indy JRuby+JIT+indy+Graal

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Concurrency? Parallelism? • Parallelism happens on the hardware, e.g. multi-core • Concurrency happens in software, e.g. Thread API • You can have concurrency without parallelism • You can have both with JRuby

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Parallel and Concurrent

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Scripting Java • Interact with Java classes/objects as if they were Ruby classes/ objects • no compilation + no type declarations • short-cuts to reduce the syntactic gap

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JRuby + JavaFX class GaugeController include JRubyFX::Controller fxml "gauge.fxml" def initialize(*foo) @slider.value_property.add_listener do |slider| @gauge.gauge.value = slider.value end end end

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Brakeman Pro https://brakemanpro.com

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Scripting Minecraft event(:player_egg_throw) do |e| e.hatching = true e.num_hatches = 120 e.player.mesg "hatched" end Purugin

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...and so much more!

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What Next?

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Installing • Use your favorite Ruby installer • Linux packages • Windows installation from JRuby.org • Unpack, add to PATH

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Herding Cats • Triage open issues • Add to or update wiki, docs • Respond to questions • Mailing lists (jruby, ruby-talk, ruby-dev, ...) • Social media (Twitter, IRC, Gitter, ...) • Get out there and talk to people!

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Use Ruby! • JRuby is also implemented in Ruby! • Growing "kernel" of Ruby code • 'date' ext is just Ruby calling a Java date/time lib • Reduce the Ruby to a “bite size” test or spec • Implement ﬁx or new feature in Ruby • Working code ﬁrst, perf concerns later

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Use Java! • Java knowledge is easy to pick up from Ruby • This ain't your daddy's Java • Can help with internals • Core methods • Compiler technology

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Get Involved • irc.freenode.net #jruby • jruby@ruby-lang.org • https://github.com/jruby/jruby • "You guys are the easiest open source team to work with in my career" - anonymous contributor

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Thank You! Charles Oliver Nutter headius@headius.com @headius http://jruby.org https://github.com/jruby/jruby