This document discusses: 1) The history and infrastructure of the company Linode, including their pricing and server configurations. 2) Details about scaling a Rails application on Softlayer servers to handle 600 million pageviews and 13 million images per month. 3) Examples of code optimizations made to the application including fragment caching and database optimizations like dependent destroys and counter caches.

1. Causos da linha de frente
Bruno Zanchet
@bzanchet

2. agenda
• história
• infra/arquitetura
• nosso dinheiro (revenue)
• dinheiro dos outros (venture capital)

6. linode

8. • 1 linode,
• 2 linodes,
• 3 linodes,
• ..

9. newservers

10. + 2 x Intel E5504 Quad Core 2.00 GHz
+ 48GB DDR3 ECC RAM $0.60 PER HOUR
+ 2 x 500GB SATA RAID 1 (or $432 PER MONTH)

12. softlayer

14. • 6 servers (4 app + 2 mysql master/slave)
• rails, paperclip, cap, apache+passenger
• 600M pageviews/mês
• 13M imagens

15. scaling

16. this shit ain’t easy

17. macbookair:weheartit bzanchet$ git show 6952312991079e8992603427acb15e9d9c
commit 6952312991079e8992603427acb15e9d9cb3f05e
Author: Bruno Zanchet <bzanchet@gmail.com>
Date: Mon Aug 2 17:12:59 2010 -0300
good bye dashboard..
--- a/app/controllers/home_controller.rb
+++ b/app/controllers/home_controller.rb
@@ -4,6 +4,7 @@ class HomeController < ApplicationController
def dashboard
+ redirect_to user_url(current_user.username) and return
following_ids = current_user.following_ids
count = User.sum(:hearts_count, :conditions => {:id => following_ids})
...

18. e não foi rápido

19. commit 88e9ab8b82b28ba29064726c9a9069a175c29b83
Author: Fabio Giolito <fabiogiolito@gmail.com>
Date: Thu Mar 24 09:31:59 2011 -0300
making dashboard available for everyone

21. código? bug.

22. absolutamente trivial

23. • :dependent => :destroy
• :counter_cache
• fragment caching <% cache() %>

24. # cache_helper.rb:46
private
def fragment_for(name = {}, options = nil, &block)
if controller.fragment_exist?(name, options)
controller.read_fragment(name, options)
else
pos = output_buffer.length
...

25. devops

26. $ git push
$ cap deploy

27. $ cap deploy:rollback

28. “sysadmins trabalham assim em qualquer lugar
do mundo; o trabalho deles é evitar que você
coloque esses códigos toscos e quebrados pra
rodar no maravilhoso [CentOS, RHEL ...]”

29. perguntas?

30. ferramentas

31. new relic

33. munin

35. mysql

37. http://www.facebook.com/MySQLatFacebook

38. http://www.mysqlperformanceblog.com/

39. InnoDB page sizes: plans and ideas
InnoDB Flushing: a lot of memory and slow disk
How Innodb Contention may manifest itself
The four fundamental performance metrics
Reality of Innodb Caching
InnoDB Flushing: Theory and solutions
...

40. • compressed tables
• fsync vs O_DIRECT etc
• write threads
• change buffer
• adaptative flushing

42. varnish

43. https://www.varnish-cache.org/trac/wiki/ArchitectNotes

46. mysql> select count(*) from users;
+------------+
| count(*) |
+------------+
| 1124995 |
+------------+
1 row in set (0.49 sec)

47. revenue

48. http://calacanis.com/2010/01/23/why-we-should-boycott-
comscore-and-perhaps-why-traders-should-short-their-
stock/

50. • patamares
• 5MM US uniques
• comscore
• nicho

52. VC

56. ..passada essa fase

63. fraud police

64. http://www.youtube.com/watch?v=eA8XiC3m7vw

65. mais perguntas?

66. Causos da linha de frente
Bruno Zanchet
@bzanchet