RailsConf 2011 Keynote

Before I Begin...

Wednesday, May 18, 2011

@jonleighton

♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥

♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥Wednesday, May 18, 2011


♥Wednesday, May 18, 2011


I ♥ José


Double Dream Hands:SO INTENSE


ZOMG!!!Wednesday, May 18, 2011

HAPPYWednesday, May 18, 2011

RAILSWednesday, May 18, 2011

CONFWednesday, May 18, 2011

♥ ♥ ♥ ♥Wednesday, May 18, 2011

Aaron Patterson


@tenderlove


AT&T, AT&T logo and all AT&T related marks are trademarks of AT&T Intellectual Property and/or AT&T affiliated companies.Wednesday, May 18, 2011

WWFMD?Wednesday, May 18, 2011

Richard GabrielResearcher

Guy SteeleSoftware Architect

DHHPartner


Aaron BatalionCTO

Chad DickersonCTO

Dan MeltonCTO


Corey HainesCorey Haines

Eric RiesVenture Advisor

Aaron PattersonSeñor Software

Engineer



LOLWUT


Señor Software EngineerWednesday, May 18, 2011

Señor Software EngineerWednesday, May 18, 2011



Agenda


New Features

Agenda

Development Pro Tips™

Real Talk!


I will be veryTECHNICAL

Implementation and thoughts on API design


I will be veryCRITICAL

Because my audience is smart

Because I care


New Features!


git log --since="1 year ago"


API Strategy


rails generate VC


def halts?(function)


Prepared Statements


select * from 'users' where id = 10


select * from 'users' where id = ?


DATABASE

RAILS APPWednesday, May 18, 2011

DATABASE

RAILS APP

Records


4 Steps!


DATABASE


DATABASE

RAILS APP

Token


DATABASE


DATABASE

RAILS APP

Records


4 Steps!


2 Steps!


Impact


SQLite3


0.00

0.00

0.01

0.10

1.00

10.00

100.00

10 100 1000 10000 100000

y = 0.0002e2.187x

y = 8.556E-5e2.2868x

SQLite3 Simple Prepared Statement

Number of QueriesCached Trend 1Non-Cached Trend 2


8665 q/s12987 q/s


Δ 4322 q/s


0

0

0

1

10

100

1000

10 100 1000 10000 100000

y = 0.0029e2.3111xy = 0.0003e2.2227x

SQLite3 Complex SQL Statement

Number of QueriesCached Trend 1Non-Cached Trend 2


339 q/s4184 q/s


Δ 3845 q/s


PostgreSQL


0.0

0.0

0.1

1.0

10.0

100.0

10 100 1000 10000 100000

y = 0.0004e2.1424xy = 0.0002e2.3018x

PostgreSQL Simple Query

QueriesCached Trend 1No Cache Trend 2


4662 q/s5586 q/s


Δ 924 q/s


0

0

0

1

10

100

1000

10 100 1000 10000 100000

y = 0.0047e2.2153x

y = 0.0005e2.173x

PostgreSQL Complex Query

QueriesCached Trend 1No Cache Trend 2


307 q/s3322 q/s


Δ 3015 q/s


MySQL


0

0

0

1

10

100

10 100 1000 10000 100000

MySQL Simple Query

QueriesCache No Cache


6410 q/s5154 q/s


Δ -1256 q/s


0

0

0

1

10

100

1000

10 100 1000 10000 100000

MySQL Complex SQL Query

Category TitleCachedNo Cache


626 q/s1198 q/s


Δ 572 q/s


No Query Planning


Two Network Roundtrips


Problem?Wednesday, May 18, 2011


[[#<Mysql::Time:2011-05-13 22:03:55>]]

[["2011-05-13 22:03:55"]]

select updated_at from pirates


[[#<Mysql::Time:2011-05-13 22:03:55>]]

[["2011-05-13 22:03:55"]]


Prepared Statement


[[#<Mysql::Time:2011-05-13 22:03:55>]]

[["2011-05-13 22:03:55"]]


Regular Statement


API Changes


User.find 1


User.find 1


SerializedAttributes


class User < ActiveRecord::Base serialize :preferencesend


user = User.find 1user.preferences = { :hello => 'world!' }user.save!

Saves as YAML


Why YAML?


class User < ActiveRecord::Base serialize :preferences, Base64Encoder.newend


class Base64Encoder def load(value) return unless value value.unpack('m').last end

def dump(text) [text].pack('m') endend

Base 64 Storage


class JSONEncoder def load(value) return unless value JSON.load value end

def dump(text) JSON.dump(text) endend

JSON Storage


class MarshalEncoder def load(value) return unless value Marshal.load value end

def dump(text) Marshal.dump(text) endend

Marshal Storage


class XMLEncoder def load(value) return unless value Nokogiri.XML value end

def dump(doc) doc.to_xml endend

XML Storage


Official NoSQL Support


Official NoSQL Support

IT'SOFFICIAL!



2 Caveats


PostgreSQL Only


You might hurt yourself



DO NOT DO THISclass User < ActiveRecord::Base class HStore def load value return unless value eval "{#{value}}" end

def dump value return unless value value.map { |xs| xs.join '=>' }.join ', ' end end

serialize :preferences, HStore.newend


class BCryptCoder def load(value) return unless value BCrypt::Password.new value end

def dump(value) BCrypt::Password.create(value).to_s endend

BCrypt Coder


BCrypt Serialization

class User < ActiveRecord::Base serialize :crazy_column, BCryptCoder.newend


Dumping Loading

YAML dump load

JSON dump load

Marshal dump load

stdlib serialization API


YOU choose

Storage type

Column name


Good Abstractionsyield

Good Features


CONSISTENCYis FREEDOM

and FLEXIBILITY


has_secure_password


class User < ActiveRecord::Base has_secure_passwordend

SECURITY!


SECURITY!

user = User.find 1user.password = 'lolwut'user.save!


♥ Introduces a new method

♥ Saves password in `password_digest`

♥ Uses BCrypt

Advantages


♥ Introduces a new method

♥ Saves password in `password_digest`

♥ Uses BCrypt

DisadvantagesAPI is not flexible

Not reusable


GO GREEN!


Write SomethingREUSABLE!


StreamingResponses

response streaming

chunked encoding


Rack API

class MyApp def call(env) [200, { 'X-ZOMG' => 'hi' }, ['web page!']] endend


Rails 3.0.x

class PoniesController def call(env) body << render(:content) body << render(:layout)

[200, {}, body] endend


DelayedEvaluation


Body#each


Rails 3.1.xclass DelayedBody def each yield render(:layout) yield render(:content) endend

class PoniesController def call(env) [200, {}, DelayedBody.new] endend


Middleware


Middleware☹Wednesday, May 18, 2011

Request Timer

Middleware Chain

Connection Manager

Application

Just consider connection manager and application


Middleware Chain

Connection Manager

Application


Middleware Chain

Connection Manager

Application

call(env)

call(env)


Middleware Chain

Connection Manager

Application

[200, {}, body]

[200, {}, body]


Connection Manager

When ERb is evaluated,db connection does notexist


Connection Manager

Open DB Connection When ERb is evaluated,db connection does notexist


Connection Manager

Open DB Connection

Delegate



Connection Manager

Open DB Connection

Delegate

Close DB Connection



Connection Manager

Open DB Connection

Delegate

Close DB Connection

Return Delegate Values





Body#close


Body Proxy

class ConnectionBodyProxy def initialize(delegate) @delegate = delegate end def each(&blk) @delegate.each(&blk) end def close # CLOSE CONNECTION endend


Connection Manager

class ConnectionManager def initialize(app); @app = app; end

def call(env) # OPEN CONNECTION response = @app.call(env) response[2] = ConnectionBodyProxy.new(response[2]) response endend





~25 middleware


Embrace Diversity


Types of Middleware

♥ Generators (our application)

♥ Filters (gzip, etc)

♥ Lifecycle Handlers (connection management)


Real Talk!


Rails is getting slower


Time for N Requests

0.01

0.1

1

10

100

10 100 1000 10000

Requests

Rails 2.3 Rails 3.0


Avg Requests / time

50

162.5

275

387.5

500

10 100 1000 10000

Requests

Rails 2.3 Rails 3.0


MiddlewareIncreased


/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/rubyTotal samples: 740Focusing on: 740Dropped nodes with <= 3 abs(samples)Dropped edges with <= 0 samples

RackRuntime#call

0 (0.0%)of 463 (62.6%)

RailsRack

Logger#call0 (0.0%)

of 463 (62.6%)

463

ActionDispatchShowExceptions#call

0 (0.0%)of 381 (51.5%)

381

RailsRack

Logger#after_dispatch0 (0.0%)

of 80 (10.8%)

80

#<Class:0x102625d88>#call0 (0.0%)

of 462 (62.4%)

462

Mutex#synchronize1 (0.1%)

of 462 (62.4%)

RackLock#call

0 (0.0%)of 462 (62.4%)

462

ActiveSupportBufferedLogger#flush

77 (10.4%)of 78 (10.5%)

77

462

462

RailsApplication#call

0 (0.0%)of 462 (62.4%)

462

Integer#times0 (0.0%)

of 461 (62.3%)

461

ActionDispatchCallbacks#call

2 (0.3%)of 383 (51.8%)

ActionDispatchCallbacks#_run_call_callbacks

0 (0.0%)of 381 (51.5%)

381

ActiveRecordConnectionAdapters

ConnectionManagement#call0 (0.0%)

of 381 (51.5%)

381

RackSendfile#call

0 (0.0%)of 383 (51.8%)

383

ActionDispatchRemoteIp#call

0 (0.0%)of 382 (51.6%)

382

381

381

ActiveRecordQueryCache#call

2 (0.3%)of 377 (50.9%)

375

Class#cache0 (0.0%)

of 376 (50.8%)

375

ActionDispatchCookies#call

4 (0.5%)of 372 (50.3%)

372

Object#cache0 (0.0%)

of 373 (50.4%)

373

373

ActionDispatchSession

AbstractStore#call1 (0.1%)

of 367 (49.6%)

367

ActionDispatchFlash#call

0 (0.0%)of 365 (49.3%)

365

ActionDispatchParamsParser#call

0 (0.0%)of 360 (48.6%)

360

ActionDispatchHead#call

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ActionDispatchBestStandardsSupport#call

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359

RackMethodOverride#call

0 (0.0%)of 360 (48.6%)

360

360

ActionDispatchRouting

RouteSet#call0 (0.0%)

of 357 (48.2%)

357

RackMount


of 357 (48.2%)

357

RackMount

RouteSet#recognize1 (0.1%)

of 357 (48.2%)

357

ActionDispatchRoutingRouteSet

Dispatcher#call0 (0.0%)

of 355 (48.0%)

355 355

Array#optimized_each1 (0.1%)

of 356 (48.1%)

356 355


Dispatcher#dispatch1 (0.1%)

of 355 (48.0%)

355

PostsController.action3 (0.4%)

of 354 (47.8%)

354

ActionControllerMetal#dispatch

0 (0.0%)of 350 (47.3%)

350

346

ActionControllerMetal#process

0 (0.0%)of 339 (45.8%)

339

AbstractControllerBase#process

0 (0.0%)of 338 (45.7%)

338

ActionControllerMetal#process_action

3 (0.4%)of 337 (45.5%)

337

956

ActiveSupportNotifications.instrument

0 (0.0%)of 322 (43.5%)

322

ActionControllerMetal#run_callbacks

1 (0.1%)of 311 (42.0%)

311

AbstractControllerBase#process_action

0 (0.0%)of 305 (41.2%)

305

Symbol#to_proc4 (0.5%)

of 82 (11.1%)

2

312

ActiveSupportNotifications

Instrumenter#instrument0 (0.0%)

of 322 (43.5%)

507

Object#_render_template2 (0.3%)

of 189 (25.5%)

175

ActionViewTemplate#render

2 (0.3%)of 167 (22.6%)

167

487

ApplicationController#_run_process_action_callbacks0 (0.0%)

of 310 (41.9%)

310

PostsController#_run__84203013__process_action__199225275__callbacks0 (0.0%)

of 310 (41.9%)

310

307

ActionControllerMetal#send_action

0 (0.0%)of 305 (41.2%)

305

Object#send_action0 (0.0%)

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305

PostsController#index2 (0.3%)

of 305 (41.2%)

305

ActionControllerMetal#respond_to

0 (0.0%)of 239 (32.3%)

239

Post.all0 (0.0%)

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66

ActionControllerMetal#retrieve_response_from_mimes

5 (0.7%)of 239 (32.3%)

239

2

ActionControllerMetal#default_render

0 (0.0%)of 231 (31.2%)

231

ActionControllerMetal#render

1 (0.1%)of 231 (31.2%)

231

438

ActionControllerMetal#cleanup_view_runtime

0 (0.0%)of 230 (31.1%)

230

Benchmark.ms10 (1.4%)

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230

ActionControllerMetal#render_to_string

0 (0.0%)of 219 (29.6%)

219230

230

219

Benchmark.realtime0 (0.0%)

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220219

ActionControllerMetal#render_to_body

2 (0.3%)of 213 (28.8%)

213

424

ActionControllerMetal#_render_template

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210

Object#render0 (0.0%)

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189185

18

Object#_render_layout6 (0.8%)

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155

167

Object#_app_views_layouts_application_html_erb___604422253_2164033400_00 (0.0%)

of 148 (20.0%)

148

149

1

Object#stylesheet_link_tag0 (0.0%)

of 85 (11.5%)

85

Object#javascript_include_tag3 (0.4%)

of 58 (7.8%)

58

garbage_collector146 (19.7%)

Object#require27 (3.6%)

of 128 (17.3%)165

Kernel#require28 (3.8%)

of 63 (8.5%)

118

Rails30Application.method_missing

0 (0.0%)of 62 (8.4%)

62

Object#expand_stylesheet_sources0 (0.0%)

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83

Object#collect_asset_files81 (10.9%)

81

78

ActiveSupportLogSubscriber.flush_all!

0 (0.0%)of 80 (10.8%)

80

80

78

Object#all0 (0.0%)

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62

74

60

ActiveRecordRelation#to_a

1 (0.1%)of 62 (8.4%)

Post.find_by_sql0 (0.0%)

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57

62

Object#run_initializers0 (0.0%)

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RailsInitializable

Initializer#run0 (0.0%)

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60

RailsApplication#initialize!

0 (0.0%)of 62 (8.4%)

62

62

Object#instance_exec2 (0.3%)

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17

60

Object#map0 (0.0%)

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SQLiteAdapter#execute1 (0.1%)

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RackRuntime#call

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RailsRack

Logger#call0 (0.0%)

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463


0 (0.0%)of 381 (51.5%)

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RailsRack


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#<Class:0x102625d88>#call0 (0.0%)

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462


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RackLock#call

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77 (10.4%)of 78 (10.5%)

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462

462


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462


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461


2 (0.3%)of 383 (51.8%)


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381



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381

RackSendfile#call

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383


0 (0.0%)of 382 (51.6%)

382

381

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2 (0.3%)of 377 (50.9%)

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Class#cache0 (0.0%)

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372


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373

373



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367


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365


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360


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359


0 (0.0%)of 360 (48.6%)

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360



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357

RackMount


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357

RackMount


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357


Dispatcher#call0 (0.0%)

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355 355


of 356 (48.1%)

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355


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354


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350

346


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339


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337

956


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311


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2

312



of 322 (43.5%)

507


of 189 (25.5%)

175


2 (0.3%)of 167 (22.6%)

167

487


of 310 (41.9%)

310


of 310 (41.9%)

310

307


0 (0.0%)of 305 (41.2%)

305


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305


of 305 (41.2%)

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Post.all0 (0.0%)

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239

2


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231


1 (0.1%)of 231 (31.2%)

231

438


0 (0.0%)of 230 (31.1%)

230


of 230 (31.1%)

230


0 (0.0%)of 219 (29.6%)

219230

230

219


of 220 (29.7%)

220219


2 (0.3%)of 213 (28.8%)

213

424


0 (0.0%)of 210 (28.4%)

210


of 190 (25.7%)

190

189185

18


of 155 (20.9%)

155

167


of 148 (20.0%)

148

149

1


of 85 (11.5%)

85


of 58 (7.8%)

58



of 128 (17.3%)165


of 63 (8.5%)

118


0 (0.0%)of 62 (8.4%)

62


of 83 (11.2%)

83


81

78


0 (0.0%)of 80 (10.8%)

80

80

78

Object#all0 (0.0%)

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74

60


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60


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62


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60

Object#map0 (0.0%)

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of 56 (7.6%)



RackRuntime#call

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463


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#<Class:0x102625d88>#call0 (0.0%)

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462


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RackLock#call

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77 (10.4%)of 78 (10.5%)

77

462

462


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462


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461


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381



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381

RackSendfile#call

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383


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382

381

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Class#cache0 (0.0%)

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372


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373



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367


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359


0 (0.0%)of 360 (48.6%)

360

360



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357

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357

RackMount


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357


RouteSetDispatcher#call

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355 355


of 356 (48.1%)

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of 355 (48.0%)

355


of 354 (47.8%)

354


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350

346


0 (0.0%)of 339 (45.8%)

339


0 (0.0%)of 338 (45.7%)

338


3 (0.4%)of 337 (45.5%)

337

956


0 (0.0%)of 322 (43.5%)

322


1 (0.1%)of 311 (42.0%)

311


0 (0.0%)of 305 (41.2%)

305


of 82 (11.1%)

2

312



of 322 (43.5%)

507


of 189 (25.5%)

175


2 (0.3%)of 167 (22.6%)

167

487


of 310 (41.9%)

310


of 310 (41.9%)

310

307


0 (0.0%)of 305 (41.2%)

305


of 305 (41.2%)

305


of 305 (41.2%)

305


0 (0.0%)of 239 (32.3%)

239

Post.all0 (0.0%)

of 66 (8.9%)

66


5 (0.7%)of 239 (32.3%)

239

2


0 (0.0%)of 231 (31.2%)

231


1 (0.1%)of 231 (31.2%)

231

438


0 (0.0%)of 230 (31.1%)

230


of 230 (31.1%)

230


0 (0.0%)of 219 (29.6%)

219230

230

219


of 220 (29.7%)

220219


2 (0.3%)of 213 (28.8%)

213

424


0 (0.0%)of 210 (28.4%)

210


of 190 (25.7%)

190

189185

18


of 155 (20.9%)

155

167


of 148 (20.0%)

148

149

1


of 85 (11.5%)

85


of 58 (7.8%)

58



of 128 (17.3%)165


of 63 (8.5%)

118


0 (0.0%)of 62 (8.4%)

62


of 83 (11.2%)

83


81

78


0 (0.0%)of 80 (10.8%)

80

80

78

Object#all0 (0.0%)

of 62 (8.4%)

62

74

60


1 (0.1%)of 62 (8.4%)


of 57 (7.7%)

57

62


of 62 (8.4%)60

RailsInitializable


of 60 (8.1%)

60


0 (0.0%)of 62 (8.4%)

62

62


of 60 (8.1%)

17

60

Object#map0 (0.0%)

of 57 (7.7%)



of 56 (7.6%)


GC Pressure


0

17.5

35

52.5

70

Stack Depth

Rails 2.3 Rails 3.0 Rails 3.1

Stack Depth


Rails 2.3 Stack


51 deep


Rails 3.0 Stack


60 deep


Rails 3.1 Stack


67 deep


/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal/implicit_render.rb:5:in `send_action'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal/implicit_render.rb:5:in `send_action'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/abstract_controller/base.rb:150:in `process_action'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal/rendering.rb:11:in `process_action'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/abstract_controller/callbacks.rb:18:in `process_action'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/callbacks.rb:436:in `_run__84203013__process_action__199225275__callbacks'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/callbacks.rb:410:in `send'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/callbacks.rb:410:in `_run_process_action_callbacks'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/callbacks.rb:94:in `send'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/callbacks.rb:94:in `run_callbacks'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/abstract_controller/callbacks.rb:17:in `process_action'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal/instrumentation.rb:30:in `process_action'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/notifications.rb:52:in ìnstrument'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/notifications/instrumenter.rb:21:in ìnstrument'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/notifications.rb:52:in ìnstrument'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal/instrumentation.rb:29:in `process_action'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal/rescue.rb:17:in `process_action'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/abstract_controller/base.rb:119:in `process'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/abstract_controller/rendering.rb:41:in `process'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal.rb:138:in `dispatch'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal.rb:178:in àction'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/route_set.rb:62:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/route_set.rb:62:in `dispatch'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/route_set.rb:27:in `call'/Library/Ruby/Gems/1.8/gems/rack-mount-0.6.14/lib/rack/mount/route_set.rb:148:in `call'/Library/Ruby/Gems/1.8/gems/rack-mount-0.6.14/lib/rack/mount/code_generation.rb:93:in `recognize'/Library/Ruby/Gems/1.8/gems/rack-mount-0.6.14/lib/rack/mount/code_generation.rb:68:in òptimized_each'/Library/Ruby/Gems/1.8/gems/rack-mount-0.6.14/lib/rack/mount/code_generation.rb:92:in `recognize'/Library/Ruby/Gems/1.8/gems/rack-mount-0.6.14/lib/rack/mount/route_set.rb:139:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/route_set.rb:493:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/head.rb:14:in `call'/Library/Ruby/Gems/1.8/gems/rack-1.2.2/lib/rack/methodoverride.rb:24:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/params_parser.rb:21:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/flash.rb:182:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/session/abstract_store.rb:149:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/cookies.rb:302:in `call'/Library/Ruby/Gems/1.8/gems/activerecord-3.0.7/lib/active_record/query_cache.rb:32:in `call'/Library/Ruby/Gems/1.8/gems/activerecord-3.0.7/lib/active_record/connection_adapters/abstract/query_cache.rb:28:in `cache'/Library/Ruby/Gems/1.8/gems/activerecord-3.0.7/lib/active_record/query_cache.rb:12:in `cache'/Library/Ruby/Gems/1.8/gems/activerecord-3.0.7/lib/active_record/query_cache.rb:31:in `call'/Library/Ruby/Gems/1.8/gems/activerecord-3.0.7/lib/active_record/connection_adapters/abstract/connection_pool.rb:354:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/callbacks.rb:46:in `call'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/callbacks.rb:416:in `_run_call_callbacks'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/callbacks.rb:44:in `call'/Library/Ruby/Gems/1.8/gems/rack-1.2.2/lib/rack/sendfile.rb:107:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/remote_ip.rb:48:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/show_exceptions.rb:47:in `call'/Library/Ruby/Gems/1.8/gems/railties-3.0.7/lib/rails/rack/logger.rb:13:in `call'/Library/Ruby/Gems/1.8/gems/rack-1.2.2/lib/rack/runtime.rb:17:in `call'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/cache/strategy/local_cache.rb:72:in `call'/Library/Ruby/Gems/1.8/gems/rack-1.2.2/lib/rack/lock.rb:11:in `call'/Library/Ruby/Gems/1.8/gems/rack-1.2.2/lib/rack/lock.rb:11:in `synchronize'/Library/Ruby/Gems/1.8/gems/rack-1.2.2/lib/rack/lock.rb:11:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/static.rb:30:in `call'/Library/Ruby/Gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:168:in `call'fuuu.rb:44fuuu.rb:43:in `times'fuuu.rb:43


/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal/implicit_render.rb:5:in `send_action'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal/implicit_render.rb:5:in `send_action'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/abstract_controller/base.rb:150:in `process_action'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal/rendering.rb:11:in `process_action'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/abstract_controller/callbacks.rb:18:in `process_action'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/callbacks.rb:436:in `_run__84203013__process_action__199225275__callbacks'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/callbacks.rb:410:in `send'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/callbacks.rb:410:in `_run_process_action_callbacks'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/callbacks.rb:94:in `send'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/callbacks.rb:94:in `run_callbacks'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/abstract_controller/callbacks.rb:17:in `process_action'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal/instrumentation.rb:30:in `process_action'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/notifications.rb:52:in ìnstrument'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/notifications/instrumenter.rb:21:in ìnstrument'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/notifications.rb:52:in ìnstrument'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal/instrumentation.rb:29:in `process_action'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal/rescue.rb:17:in `process_action'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/abstract_controller/base.rb:119:in `process'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/abstract_controller/rendering.rb:41:in `process'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal.rb:138:in `dispatch'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_controller/metal.rb:178:in àction'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/route_set.rb:62:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/route_set.rb:62:in `dispatch'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/routing/route_set.rb:27:in `call'/Library/Ruby/Gems/1.8/gems/rack-mount-0.6.14/lib/rack/mount/route_set.rb:148:in `call'/Library/Ruby/Gems/1.8/gems/rack-mount-0.6.14/lib/rack/mount/code_generation.rb:93:in `recognize'/Library/Ruby/Gems/1.8/gems/rack-mount-0.6.14/lib/rack/mount/code_generation.rb:68:in 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`call'/Library/Ruby/Gems/1.8/gems/activerecord-3.0.7/lib/active_record/query_cache.rb:32:in `call'/Library/Ruby/Gems/1.8/gems/activerecord-3.0.7/lib/active_record/connection_adapters/abstract/query_cache.rb:28:in `cache'/Library/Ruby/Gems/1.8/gems/activerecord-3.0.7/lib/active_record/query_cache.rb:12:in `cache'/Library/Ruby/Gems/1.8/gems/activerecord-3.0.7/lib/active_record/query_cache.rb:31:in `call'/Library/Ruby/Gems/1.8/gems/activerecord-3.0.7/lib/active_record/connection_adapters/abstract/connection_pool.rb:354:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/callbacks.rb:46:in `call'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/callbacks.rb:416:in `_run_call_callbacks'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/callbacks.rb:44:in `call'/Library/Ruby/Gems/1.8/gems/rack-1.2.2/lib/rack/sendfile.rb:107:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/remote_ip.rb:48:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/show_exceptions.rb:47:in `call'/Library/Ruby/Gems/1.8/gems/railties-3.0.7/lib/rails/rack/logger.rb:13:in `call'/Library/Ruby/Gems/1.8/gems/rack-1.2.2/lib/rack/runtime.rb:17:in `call'/Library/Ruby/Gems/1.8/gems/activesupport-3.0.7/lib/active_support/cache/strategy/local_cache.rb:72:in `call'/Library/Ruby/Gems/1.8/gems/rack-1.2.2/lib/rack/lock.rb:11:in `call'/Library/Ruby/Gems/1.8/gems/rack-1.2.2/lib/rack/lock.rb:11:in `synchronize'/Library/Ruby/Gems/1.8/gems/rack-1.2.2/lib/rack/lock.rb:11:in `call'/Library/Ruby/Gems/1.8/gems/actionpack-3.0.7/lib/action_dispatch/middleware/static.rb:30:in `call'/Library/Ruby/Gems/1.8/gems/railties-3.0.7/lib/rails/application.rb:168:in `call'fuuu.rb:44fuuu.rb:43:in `times'fuuu.rb:43

TL;DRWednesday, May 18, 2011

Embrace Diversity


We need a change


Generators

class Application def call(request, response) response.write(request, "hello", 200, {})

10.times do |body| response.write(request, body) end

response.close endend


Filtersclass Filter def initialize(filter) @filter = filter end

def write(request, body, status = nil, headers = nil) @filter.write(request, body, status, headers) end

def close @filter.close endend


Lifecycle Hooks

class Handler def before(request) # Connect to database end

def after(request) # Disconnect endend


0

17.5

35

52.5

70

Stack Depth

Rails 2.3 Rails 3.0 Rails 3.1 Rails 3.2?

Stack Depth


Time for N Requests

0.01

0.1

1

10

100

10 100 1000 10000

Requests

Rails 2.3 Rails 3.0 Rails 3.2?


Avg Requests / time

50

200

350

500

650

10 100 1000 10000

Requests

Rails 2.3 Rails 3.0 Rails 3.2?


git log --until="1 year from now"


We Must Change

Important things to me


Speed


Memory


Stack Depth


Backwards Compat


DevelopmentPro Tip™



Final Words


A Message forRails-Core

We will not be here forever

Rails will outlive us

Encourage refactoring

Stop "yes men"


Not all features are Tangible


Good Abstraction yield

Reusable Code


Reusable Codeyield

New Features


Your Homework:


GO GREEN!


Refactor Rails!


GO FORTH ANDCODE!


♥ THANKS! ♥


QUESTIONS?


Technology

RailsConf 2011 Keynote