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![N+1 Select
photos = Photo.find(:all, :include => [:rating, :user, :email])
photos.each do |photo|
puts photo.rating.id
puts photo.user.email
puts photo.camera.name
end
How many queries does this execute?](https://image.slidesharecdn.com/performance-100810110217-phpapp02/75/Rails-Performance-Tricks-and-Treats-34-2048.jpg)
Uploaded byMarshall Yount
Rails Performance Tricks and Treats
This document discusses various techniques for improving Rails application performance, including reducing roundtrips through CSS sprites and data URIs, using tools like Firebug and NewRelic to diagnose issues, avoiding N+1 queries, and leveraging caching, monitoring, and scaling. It also briefly mentions plugins like Bullet and tools like RubyProf that can help optimize applications.
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Rails Performance Tricks and Treats
- 1. Rails Performance Tricks andTreats Marshall Yount Yount Labs
- 2. Everything I really needto know about code optimization I learned by playing Quake
- 3. The Big Picture •What is Performance? • How do we know we’re performant? • What tools do we use? • How do we fix problems? • Demonstration
- 4. Different ways of lookingat performance • Client perceived • Server
- 5. Client • slow loading web page (latency) • slow executing webpage (javascript/css) http://www.flickr.com/photos/7423510@N06/2984486385/
- 6. The Enemy Latency:It’s a bitch
- 7.
- 8. Diagnostic Tools (Client) • Firebug • YSlow • PageSpeed • UserTime
- 9. Diagnostic Tools (Client) • Firebug • YSlow • PageSpeed • UserTime
- 10. Diagnostic Tools (Client) • Firebug • YSlow • PageSpeed • UserTime
- 11. Diagnostic Tools (Client) • Firebug • YSlow • PageSpeed • UserTime
- 12. Reducing Roundtrips • CSSSprites • CSS Data URIs • Jammit • Rails *_link_tag http://www.flickr.com/photos/mezzoblue/3217540317/
- 13. Reducing Roundtrips • CSSSprites ul.checklist li.complete { margin-left: 20px; background: • CSS Data URIs url('data:image/ png;base64,AAAAFGGFyjOXZtQAAAAAElFT...') • Jammit top left no-repeat; } • Rails *_link_tag
- 14. Reducing Roundtrips <%= stylesheet_link_tag "main", "nav", • CSS Sprites "blog", :cache => “pagename_all” %> • CSS Data URIs <link href="/stylesheets/ • Jammit pagename_all.css?1234567890" media="screen" rel="stylesheet" • Rails *_link_tag type="text/css" />
- 15. HTTP Hacking forFun and Profit • Off with her <HEAD> • Expires: • Last-Modified: • ETag: • Content-Encoding:
- 16. Server • registers • memory •network • database • disk • APIs http://www.flickr.com/photos/buro9/298998011/
- 17. Infrastructure • squid 2.7 •varnish • memcached • redis / resque
- 18. Top Clones • top •htop • mytop • memcache-top
- 19. Top Clones • top •htop • mytop • memcache-top
- 20. Top Clones • top •htop • mytop • memcache-top
- 21. Top Clones • top •htop • mytop • memcache-top
- 22. Monitoring -- free •nagios • cacti • zabbix • zenoss (core)
- 23. Monitoring -- free •nagios • cacti • zabbix • zenoss (core)
- 24. Monitoring -- free •nagios • cacti • zabbix • zenoss (core)
- 25. Monitoring -- free •nagios • cacti • zabbix • zenoss (core)
- 26. Monitoring -- paid •Pingdom Text • NewRelic • Scout
- 27. Monitoring -- paid •Pingdom • NewRelic • Scout
- 28. Monitoring -- paid •Pingdom • NewRelic • Scout
- 29. Fixing Problems • Performanceis a moving target! • Horizontal/ Vertical scaling http://www.flickr.com/photos/tpapi/2765541278/
- 30. NewRelic Workflow • WebTransactions • Most Time Consuming • Slowest Average Response Time • Database
- 31. And the NumberOne Ruby on Rails Performance Problem Is ...
- 32. And the NumberOne Ruby on Rails Performance Problem Is ... N+1 Select
- 33. N+1 Select photos.each do |photo| puts photo.rating.id puts photo.user.email puts photo.camera.name end How many queries does this execute?
- 34. N+1 Select photos =Photo.find(:all, :include => [:rating, :user, :email]) photos.each do |photo| puts photo.rating.id puts photo.user.email puts photo.camera.name end How many queries does this execute?
- 35. Plugins/Gems • bullet • slim_scrooge •query_reviewer • ambitious_query_indexer • ActiveRecord::Extensions
- 36. Still not fastenough for ya? • ruby-prof • memprof - where are objects being created • change interpreters • ree -- gc.enable stats • jruby • ruby 1.9
- 37. Readings • Mark Nottingham’s HTTP caching tutorial • http://www.mnot.net/cache_docs/ • YSlow Best Practices • http://developer.yahoo.com/performance/rules.html • http://delicious.com/marshall.yount/performance
- 38. Tools • http://documentcloud.github.com/jammit/ • http://jeremy.zawodny.com/mysql/mytop/ •http://htop.sourceforge.net/ • http://code.google.com/p/memcache-top/
- 39. Appendix • The followingincomplete slides were suggested by audience members at the Dallas Ruby Brigade. I’ll be fleshing these out and adding them to a future version of the presentation.
- 40.
- 41. Template rendering pain
- 42. Database Model Fields •wasteful data types • varchars •
- 43.
Editor's Notes
- #3 Tell a nice little story about how I got into optimizations
- #4 ASK: What is performance: take a survey group items on board between client and server metrics
- #8 ASK: What are your favorite client tools
- #17 ASK: What are your favorite server tools?
- #18 ASK: What are some other infrastructure tools more tools here than you can shake a stick at.
- #19 http://jeremy.zawodny.com/mysql/mytop/ http://htop.sourceforge.net/ http://code.google.com/p/memcache-top/
- #20 http://jeremy.zawodny.com/mysql/mytop/ http://htop.sourceforge.net/ http://code.google.com/p/memcache-top/
- #21 http://jeremy.zawodny.com/mysql/mytop/ http://htop.sourceforge.net/ http://code.google.com/p/memcache-top/
- #29 Rack-a-mole
- #37 check 37signals twitter and others for publicly posted gc settings