why
you should
be using
JRuby
in PRODUCTION

who am i

IVO anjo

Ruby ❤

CONCURRENCY ❤

}

JRuby ❤ 

@knux
{talkdesk_ruby_ninja: self}

jruby?

who am i

IVO anjo

Ruby ❤

CONCURRENCY ❤

}

JRuby ❤ 

@knux
{talkdesk_ruby_ninja: self}

why
you should
be using
  Ruby
in PRODUCTION

MINSWAN
matz is nice so we are nice

expressive

duck typing

everything is an object

easy to write dslₛ

less boilerplate

awesome pry repl

awesome web libraries

RAILS

NOT RAILS: GRAPE, RODA, HANAMI

awesome testing libraries

RSPEC

cucumber

awesome * libraries

data stores

apis

“There's a gem for that”

* server

* PROTOCOL

SO... JRUBY?

ruby on top of the java vm

SO... JRUBY?

WHy #1: PERFORMANCE

JIT COMPILER

STATE-of-THE-ART GC

SO... JRUBY?

WHy #2: MASSIVELY PARALLEL

UNLEASH THE THREADS

...AND THE ASYNC WORK

SO... JRUBY?

WHy #3: TROUBLESHOOTING

USE AWESOME JAVA TOOLING

• PROFILERS
• MONITORING
• DEBUGGERS

}

IN PRODUCTION!

SO... JRUBY?

WHy #4: EASY TO DEPLOY

RUBY TOOLING OR JAVA TOOLING

SO... JRUBY?

WHy #4½: EASY TO DEPLOY

DEPLOY AS RUBY SOURCES

OR DEPLOY AS SINGLE .JAR/.WAR

HOW hard is it to start using?

$ rvm install jruby-9.1.7.0
$ rvm USE jruby-9.1.7.0
$ GEM INSTALL BUNDLER
$ BUNDLE INSTALL

SPENT A FEW MINUTES PORTING TALKDESK's RAILS MONOLITH

1635 examples, 19 failures, 41 pending

SPENT A FEW MINUTES PORTING TALKDESK's RAILS MONOLITH

AUTHENTICATE, PLACE & LIST CALLS, ACCESS SETTINGS, ETC.

going cold-turkey is a big step

i still recommend you carefully validate your app :)

“thread carefully”?

tales
from the
trenches

contacts importer

Contacts
API

Contacts
Importer

Salesforce

Zendesk

Google

NSA

v0: unleash the threads

???

load up visualvm

googling around

oops, we were using the gem wrong

👍 fixed

v1: CPU-LIMITED? WAT?

THIS DOESN'T SEEM RIGHT...

👍 fix merged upstream!

v2: memory leaks :(

load up visualvm

follow the breadcrumbs

👍 fixED

👍 fixED

v2½: memory leaks :(

3 DAYS LATER! :)

contacts importer

huge productivity boost

wizard-level debugging MADE easy

hit double our performance target on a single instance



JRuby
101

in development

export JRUBY_OPTS=--dev
bundle install --binstubs

in development

gem 'pry-byebug',
  platforms: :ruby
gem 'pry-debugger-jruby',
  platforms: :jruby
export JRUBY_OPTS="--dev --debug"

in development

gem 'multi_json'
gem 'oj', platforms: :ruby
gem 'jrjackson', platforms: :jruby

if RUBY_PLATFORM == 'java'
  require 'jrjackson'
  MultiJson.use :jr_jackson
else
  require 'oj'
  MultiJson.use :oj
end

in development

jruby-lint

./Gemfile:24: [gems, warning] Found gem 'oj' which is reported to have some issues:
Try gson, json or json_pure instead.
Try any one of the following JRuby-based servers: Trinidad, Mizuno, Kirk or Puma (though make sure to use the JRuby-native version of the gem).
./Gemfile:43: [gems, warning] Found gem 'bson_ext' which is reported to have some issues:
bson_ext isn't used with JRuby. Instead, some native Java extensions are bundled with the bson gem.
./app/controllers/api/user_controller.rb:25: [nonatomic, warning] Non-local operator assignment is not guaranteed to be atomic

in development

concurrent-ruby
is your friend

in development

visualvm

in development

netbeans profiling

in development

jmap/jstack

$ jmap -histo 17118 | grep rubyobj
  17:          9000         288000  rubyobj.Example.A
 337:            98           3136  rubyobj.Gem.Requirement
 435:            52           1664  rubyobj.Gem.Dependency
 470:            42           1344  rubyobj.OtherStuff.B
 477:            41           1312  rubyobj.Gem.Version
 762:            13            416  rubyobj.Gem.Specification
1103:             6            192  rubyobj.Gem.Platform
4060:             1             32  rubyobj.Gem.PathSupport
4061:             1             32  rubyobj.Gem.StubSpecification
4062:             1             32  rubyobj.Gem.StubSpecification.StubLine
4063:             1             32  rubyobj.Monitor
export JRUBY_OPTS="-Xreify.classes=true"

in development

yourkit & jprofiler

in production

export JRUBY_OPTS=\
"-Xcompile.invokedynamic=true -Xmanagement.enabled=true"
export JAVA_OPTS=\
"-Xmx3g -XX:+PrintGCDetails"

in production

export JAVA_OPTS=\
"-Xss512k -Xmx500m -XX:ReservedCodeCacheSize=90m -XX:InitialCodeCacheSize=90m -XX:MaxMetaspaceSize=120m -XX:+PrintGCDetails
-XX:+PrintCodeCache"

needs some tuning for smaller machines :/

in production

THANKS!

TWITTERS: @KNUX

BLOG: ivoanjo.me