High-Performance Ruby:Evented vs readed

@drnic | drnicwilliams.com | engineyard.com

Dr Nic Williams

“rubymidwest”

“rubymidwest”

midwest

midwest

kansas

kansas city

in Missouri

midwest?!

an actual safari

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drnic

cowsay

You have $

New project/rapid dev

Optimise

(features/$)

(req latency/$)(req thru-put/$)

(bugs/$)

Add resources

Resources = $

$

or even $$$$$$$ $$ $

Optimise

New project/rapid dev(features/$)

(performance/$0)

how?

•Add resources•Use resources better

Options

you?just write

code

evented-> threads

-> your code

nginx-> trinidad-> web app

evented?arrange

I/O

threads?actualwork

you?just write

code

evented-> threads

-> your code

nginx-> trinidad-> web app

•Add resources•Use resources better

Options

•process concurrency•threaded concurrency•evented concurrency

Concurrency

Processvs

readed

•1 req = 1 process = 150Mb•“100 reqs?” = 15Gb!•Orchestrated by? Kernel•Unicorn, Passenger

ProcessConcurrency

•1 req = 1 thread = 2kb•“100 reqs?”=150Mb+200kb•Orchestrated by? Kernel•Mongrel*

readedConcurrency

1 req = 1 thread =

2kb

Processvs

readed

evented-> threads

-> your code

•....•....•....•Mongrel*

readedConcurrency

•....•....•....•Mongrel*

readedConcurrency

“Mongrel is threaded?!”

Mongrel * Rails * Ruby1.8 -->

process conc.

2006 reality:

20068 reality:“Rails 2.2... "rst...thread

safe Rails”--Pratik Naik

20068 reality:

config.threadsafe!

http://guides.rubyonrails.org/configuring.html

20068 reality:

# do nothing

http://www.sinatrarb.com/configuration.html

Mongrel * Rails * Ruby1.8 -->

process conc.

20068 reality:

200810 reality:

“Ruby 1.9.2 is released”

200810 reality:

1.9 has native threads!

200810 reality:

1 thread of Ruby at a

time :(

200810 reality:

GIL = Global Interpreter

Lock :(

200810 reality:

GIL:( “Grumpy Gil”

Mongrel * Rails * Ruby1.9 -->

process conc.

200810 reality:

“Mongrel is threaded?!”

“Rails is threadsafe”

but no threads...

“reads please!”

rvm install jrubyrvm use jrubygem install railsrails new myapp

gem 'activerecord- jdbcsqlite3- adapter'gem 'jruby-openssl'

Mongrel * Rails * JRuby --> thread

concurrency!

1 req = 1 thread =

2kb

“How do I run JRuby/

Rails?”

How?-> trinidad-> web app

$ gem install trinidad$ trinidad--> localhost:3000

$ git clone git:// github.com/ engineyard/todo.git$ cd todo$ bundle$ rake db:migrate$ trinidad

# config.threadsafe!

$ trinidadInfo: max runtimes = 5

config.threadsafe! # yes!

$ trinidad -e productionInfo: max runtimes = 1(Thread limit 200)

1 req = 1 thread =

2kb

And its just normal web

app code!

evented-> threads

-> your code

nginx-> trinidad-> web app

“I’m scared of threads”

Web apps are*

thread safe

“Store state elsewhere; Unless its safe”

Dr Nic’s Joy of Concurrency

evented-> threads

-> your code

nginx-> trinidad-> web app

“I came to hear good things

about EventMachine”

“Evented is cool, threads are not”

“You haven’t said ‘nodejs’

once!?”

What is evented?

any I/O?

do somethingwith it

cache hits

both

req ?webapp

cachemiss

cache hits

both

req ?webapp

cachemiss

both

req I/O work

both

req I/O workevented threads

both

req I/O workevented threads

trinidadnginx

nginxvs apache

“Hosted?”

500 hrs free!

jruby core trinidad corerubinius core

Come workwith us!

-> your code

“Be a happy developer”

-> threads-> your code

evented-> threads

-> your code

nginx-> trinidad-> web app

@drnic | drnicwilliams.com | engineyard.com

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@drnic | drnicwilliams.com | engineyard.com