Your SlideShare is downloading. ×
0
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Caching your rails application
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Caching your rails application

3,024

Published on

Bernard from Openminds talks about caching your Rails appication.

Bernard from Openminds talks about caching your Rails appication.

Published in: Technology
0 Comments
6 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
3,024
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
66
Comments
0
Likes
6
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Rails Need short bursts of speed?
  • 2. I’m a thief • http://railslab.newrelic.com/
  • 3. Perception
  • 4. Communication: Two parts • Server speed • Browser speed
  • 5. Browser speed • Firebug / Safari developer • YSlow • Different parts of a site
  • 6. Webpage parts • Page itself (<html> ... ) • Additional files (CSS, JavaScript) • Images • ... generating dynamic content
  • 7. Siteparts • 10 requests:10 times slower as one request • stylesheet_tag :defaults, ‘screen’, :cache => ‘all’
  • 8. images • asset hosts • Content Delivery Network
  • 9. Page Caching
  • 10. Why? • Code parsing: 20 to 50 req/second • Webserver: easily > 100 req/sec • Webserver stresses less, less database queries • Why not, it is easy (with rails)...
  • 11. implementation
  • 12. result
  • 13. expire_page
  • 14. expires-result
  • 15. conclusion: page cache • very simple • limited scope to apply • cache invalidation! Important!
  • 16. Cache Expiry
  • 17. Why not expire_page in the action? • Not DRY (update, create, destroy,...) • after_filter possible, but other controllers might need to expire the cache
  • 18. after_filter • PostsController (clear_posts_cache) • CommentsController (clear_posts_cache)
  • 19. sweeper • observer on controller and model • if saved, call clear_posts_cache • if deleted, call clear_posts_cache
  • 20. how
  • 21. Page caching - part 2 • Ajax Callbacks for dynamic data
  • 22. login/logout • pain!
  • 23. Action Caching
  • 24. Action cache • Cached output stored • Filters are processed before the cached version is returned to the browser • Example: authenticatie
  • 25. caches_action
  • 26. action cache • Filter is executed before sending the reply • Output is the same for everyone!
  • 27. Welcome <username> • content is cached • layout is rendered
  • 28. Warning! Attention! • fetch needed data with a before_filter • action is not executed!
  • 29. Conditional AC • caching only on certain conditions
  • 30. Action Caching • when? • execute code on each hit (authentication) • result remains the same • very easy to implement
  • 31. Fragment Caching
  • 32. Fragment caching • Cache part of a page • Logical blocks are candidates
  • 33. Example
  • 34. Fragment Caching
  • 35. No useless actions
  • 36. Fragment Cache expiry • expire_fragment
  • 37. PC/AC Storage
  • 38. Page cache storage • on disk
  • 39. Storage: action / fragment cache • memory (default) or syncronised memory • file on disk • drb • memcache (normal or compressed) • custom_store (not hard to impelement!)
  • 40. DYI
  • 41. DYI caching • Caching hard parts in the code • Only spend cycles when really needed
  • 42. Client-side caching • The cloud is there, use it
  • 43. Three tags • max-age • etag • last_modified
  • 44. max-age
  • 45. etag • rails has this embedded • MD5(body) => etag • 304 Not Modified
  • 46. etag • Beware, the complete parsing is done! • Less bandwidth / traffic • Client load time faster
  • 47. etag
  • 48. last_modified
  • 49. Scary technology? • memcached • reverse proxy’s
  • 50. Memcached • Daemon • Is a big hash in memory • Rails has default routines for this • Hoster / setup should support this
  • 51. Reverse Proxy’s • a proxy, but on the server side • controle over expiry: max_age + etag • expiry remains a pain
  • 52. Rack::Cache • gem install rack-cache • rails 2.3 needed!
  • 53. Need for speed? • Database (n+1, joins / includes) • Disk IO • Implementing caching • Browser caching • External components (CDN, memcached, ...)

×