Rupicon 2014 caching
0 likes98 views
This document discusses caching techniques in Rails, including: 1. Using cache digests to avoid worrying about cache dependencies and versioning. 2. Caching fragments and associations to improve performance when data changes. 3. Leveraging browser, CDN, and other edge caching to further improve page load speeds.
![- @projects.each do |project|
- cache ['project', project] do
...project
- project.todo_lists.each do |todo_list|
- cache ['todo_list', todo_list] do
...todo list
- todo_list.todos.each do |todo_list|
- cache ['todo', todo] do
...todo
UFCLQMKCRFGLEAF?LECQ
UCBMLRF?TCRMPCECLCP?RCRFCCLRGPC
N?EC
20 / 58](https://image.slidesharecdn.com/rupicon2014caching-141003095559-phpapp02/85/Rupicon-2014-caching-21-320.jpg)
![!CDMPC1?GJQ
- @projects.each do |project|
- cache ['v1', 'project', project] do
21 / 58](https://image.slidesharecdn.com/rupicon2014caching-141003095559-phpapp02/85/Rupicon-2014-caching-22-320.jpg)
![hit rate?
cache ['event', event] do
turns into:
cache ['event', event, current_user] do
Hit rate: 1 / Event.count * User.count
*probably should avoid
31 / 58](https://image.slidesharecdn.com/rupicon2014caching-141003095559-phpapp02/85/Rupicon-2014-caching-32-320.jpg)
![def show
@article = Article.find(params[:id])
if stale?(:etag = @article, :last_modified
= @article.created_at.utc)
@statistics = @article.really_expensive_call
respond_to do |format|
# all the supported formats
end
end
end
40 / 58](https://image.slidesharecdn.com/rupicon2014caching-141003095559-phpapp02/85/Rupicon-2014-caching-41-320.jpg)
![def show
@article = Article.find(params[:id])
if stale?(:etag = @article, :last_modified
= @article.created_at.utc)
@statistics = @article.really_expensive_call
respond_to do |format|
# all the supported formats
end
end
end
41 / 58](https://image.slidesharecdn.com/rupicon2014caching-141003095559-phpapp02/85/Rupicon-2014-caching-42-320.jpg)
![def show
@article = Article.find(params[:id])
if stale?(:etag = @article, :last_modified
= @article.created_at.utc)
@statistics = @article.really_expensive_call
respond_to do |format|
# all the supported formats
end
end
end
= 304 Not Modified
42 / 58](https://image.slidesharecdn.com/rupicon2014caching-141003095559-phpapp02/85/Rupicon-2014-caching-43-320.jpg)
![Cache-Control: public - Any cache can store a copy of the content.
Cache-Control: private - Don't store, this is for a single user.
Cache-Control: no-cache - Re-validate before serving this content.
Cache-Control: no-store - Don't store this content. Ever. At all. Please.
Cache-Control: public, max-age=[seconds] - Caches can store this content for n
seconds.
Cache-Control: s-maxage=[seconds] - Same as max-age but applies specifically
to proxy
45 / 58](https://image.slidesharecdn.com/rupicon2014caching-141003095559-phpapp02/85/Rupicon-2014-caching-46-320.jpg)
![class SuggestionsController
def show
@users = Rails.cache.fetch(['users', params['page']]) do
# we need to call .all to hit the database otherwise
# we cache only the ruby query object
User.suggestions.page(params['page']).all
end
end
end
*all is for rails3
47 / 58](https://image.slidesharecdn.com/rupicon2014caching-141003095559-phpapp02/85/Rupicon-2014-caching-48-320.jpg)
![3?E@?QCBA?AFGLE
Instead of using updated_at to cause a cache miss, record where your objects
are cached
cache @something, tag: ['dashboard', 'settings']
@users = Rails.cache.fetch(['users', params['page']],
tag: 'users') do
# we need to call .all to hit the database otherwise
# we cache only the ruby query object
User.suggestions.page(params['page']).all
end
...
User#after_commit
...
Cashier.expire users
51 / 58](https://image.slidesharecdn.com/rupicon2014caching-141003095559-phpapp02/85/Rupicon-2014-caching-52-320.jpg)
Rupicon 2014 caching
- 1. 1 / 58
- 2. 1?GJQ?AFGLE JCV?LBPS*CQXCE 2MDRU?PC#CTCJMNCP/(3$'
- 3. /+42 2 / 58
- 5. 3FGQGQ1?GJQ FMUF?PBA?LGR@C % cache @user do % %= render partial: 'user' % % end % 4 / 58
- 6. 3F?LIWMSDMPWMSPRGKC 5 / 58
- 7. 3./(2 6 / 58
- 8. 3./(2 6'8 DP?EKCLRA?AFGLE 20+A?AFGLE '33/?AFGLE CVNGP?RGML 7 / 58
- 9. 6'8 8 / 58
- 10. 6'8 9 / 58
- 11. %P?EKCLR?AFGLE cache small pieces of information instead of full pages 10 / 58
- 13. #MLMRCVNGPCICWQ 12 / 58
- 14. A?AFC=ICW SQCP4QCPDGPQR = User id: 1, updated_at: 2014-10-02 18:12:57 SQCPA?AFC=ICW = users/1-20141002181257446781000 13 / 58
- 15. A?AFC=ICW SQCP4QCPDGPQR = User id: 1 , updated_at: 2014-10-02 18:12:57 SQCPA?AFC=ICW = users/1-20141002181257446781000 14 / 58
- 16. % cache @user do % %= render partial: 'user' % % end % 15 / 58
- 17. % cache @user do % %= render partial: 'user' % % end % %GPQRRGKCUCJM?BRFCN?EC Read fragment views/users/1-20141002181257446781000/ 95a652b13f0fc5b7bc8785ac31b6b8b9 (1.2ms) Write fragment views/users/1-20141002181257446781000/ 95a652b13f0fc5b7bc8785ac31b6b8b9 (1.2ms) JJMRFCPN?ECJM?BQ Read fragment views/users/1-20141002181257446781000/ 95a652b13f0fc5b7bc8785ac31b6b8b9 (1.2ms) 16 / 58
- 19. class Project has_many :todo_lists class TodoList belongs_to :project, touch: true has_many :todos class Todo belongs_to :todo_list, touch: true UFCLQMKCRFGLEAF?LECQ GRQBGPCARN?PCLRGQ?JQMAF?LECB 18 / 58
- 20. -CQRCBA?AFGLEGQ@CQR 19 / 58
- 21. - @projects.each do |project| - cache ['project', project] do ...project - project.todo_lists.each do |todo_list| - cache ['todo_list', todo_list] do ...todo list - todo_list.todos.each do |todo_list| - cache ['todo', todo] do ...todo UFCLQMKCRFGLEAF?LECQ UCBMLRF?TCRMPCECLCP?RCRFCCLRGPC N?EC 20 / 58
- 22. !CDMPC1?GJQ - @projects.each do |project| - cache ['v1', 'project', project] do 21 / 58
- 23. 1?GJQQMJTCQRFGQNPM@JCKUGRFA?AFCBGECQRQ A call to #cache in your views will now suffix a digest of the template and its dependencies. No longer will you need to worry about fragment cache dependencies and versioning! user.cache_key = users/1-20141002181257446781000 Read fragment views/users/1-20141002181257446781000/ 95a652b13f0fc5b7bc8785ac31b6b8b9 (1.2ms) 22 / 58
- 24. 1?GJQQMJTCQRFGQNPM@JCKUGRFA?AFCBGECQRQ A call to #cache in your views will now suffix a digest of the template and its dependencies. No longer will you need to worry about fragment cache dependencies and versioning! user.cache_key = users/1-20141002181257446781000 Read fragment views/users/1-20141002181257446781000/ 95a652b13f0fc5b7bc8785ac31b6b8b9 (1.2ms) 23 / 58
- 25. 1?GJQQMJTCQRFGQNPM@JCKUGRFA?AFCBGECQRQ A call to #cache in your views will now suffix a digest of the template and its dependencies. No longer will you need to worry about fragment cache dependencies and versioning! user.cache_key = users/1-20141002181257446781000 Read fragment views/users/1-20141002181257446781000/ 95a652b13f0fc5b7bc8785ac31b6b8b9 (1.2ms) There's a gem for that rails/cache_digests 24 / 58
- 26. $VCPAGQC 25 / 58
- 27. 26 / 58
- 28. 27 / 58
- 29. /CPQNCARGTCB?R? Or how to make your cache useless 28 / 58
- 31. .col-sm-12.no-lr-padding.ticket-info .col-price-block %span.top-line From %span.ticket-price.bottom-line = formated_cheapest_ticket_price(activity) .col-tickets-left-block - unless activity.hide_remaining_tickets? %span.color-default.top-line Tickets left: %span.bottom-line = activity_tickets_left(activity) .col-attendees-block %span.top-line Attendees: %span.bottom-line = activity_attendees_count(activity) .user-buttons-block %a.btn.btn-wishlist.btn-85 %span.event_wishlist_span = wishlisted_label(activity, current_user) 30 / 58
- 32. hit rate? cache ['event', event] do turns into: cache ['event', event, current_user] do Hit rate: 1 / Event.count * User.count *probably should avoid 31 / 58
- 33. 2MJSRGMLQ 32 / 58
- 34. 2MJSRGMLQ ,MTCGRAJGCLRQGBC .event-pod{data-wishlisted=#{ wishlisted_label(activity, current_user)}} $('.event-pod').each(function(){ $(this).find('.wishlisted_button').html( $(this.data('wishlisted')) ); }) ??? This is good if you want to decouple the usere data or generate it in Also good for edge caching. *extra complexity 33 / 58
- 35. 3FCPCQECKDMPRF?R 34 / 58
- 36. neighborland/cache_rocket = render_cached 'outer', replace: 'inner' outer.html.haml - cache 'outer' do .lots .of .htmls = cache_replace_key 'inner' inner.html.haml = uncacheable_content 35 / 58
- 37. 36 / 58
- 38. @CLCDGRQ A?AFCKMPCQRSDD more hits faster pages JCQQQRSDDGLA?AFC more hits less RAM used 37 / 58
- 39. 3FCD?QRCQRAMBCGQLMAMBC 38 / 58
- 41. def show @article = Article.find(params[:id]) if stale?(:etag = @article, :last_modified = @article.created_at.utc) @statistics = @article.really_expensive_call respond_to do |format| # all the supported formats end end end 40 / 58
- 42. def show @article = Article.find(params[:id]) if stale?(:etag = @article, :last_modified = @article.created_at.utc) @statistics = @article.really_expensive_call respond_to do |format| # all the supported formats end end end 41 / 58
- 43. def show @article = Article.find(params[:id]) if stale?(:etag = @article, :last_modified = @article.created_at.utc) @statistics = @article.really_expensive_call respond_to do |format| # all the supported formats end end end = 304 Not Modified 42 / 58
- 44. $BECA?AFGLE Cloudfront Akamai fastly Varnish... 43 / 58
- 45. %MJJMURFCQCPSJCQ CTCPWRFGLEAMKKMLGQQCPTCBGLRFCGLGRG?JPCOSCQR NCPQNCARGTCB?R?BMLCUGRFHQGL?BGDDCPCLRFRRNPCOSCQR CVNGP?RGMLGQF?LBJCB@W'33/FC?BCPQ 44 / 58
- 46. Cache-Control: public - Any cache can store a copy of the content. Cache-Control: private - Don't store, this is for a single user. Cache-Control: no-cache - Re-validate before serving this content. Cache-Control: no-store - Don't store this content. Ever. At all. Please. Cache-Control: public, max-age=[seconds] - Caches can store this content for n seconds. Cache-Control: s-maxage=[seconds] - Same as max-age but applies specifically to proxy 45 / 58
- 47. 6F?R?@MSRKWKMBCJQ 46 / 58
- 48. class SuggestionsController def show @users = Rails.cache.fetch(['users', params['page']]) do # we need to call .all to hit the database otherwise # we cache only the ruby query object User.suggestions.page(params['page']).all end end end *all is for rails3 47 / 58
- 49. 'MUBMGCVNGPCRF?R 48 / 58
- 50. 'MUBMGCVNGPCRF?R 49 / 58
- 52. 3?E@?QCBA?AFGLE Instead of using updated_at to cause a cache miss, record where your objects are cached cache @something, tag: ['dashboard', 'settings'] @users = Rails.cache.fetch(['users', params['page']], tag: 'users') do # we need to call .all to hit the database otherwise # we cache only the ruby query object User.suggestions.page(params['page']).all end ... User#after_commit ... Cashier.expire users 51 / 58
- 54. !SRGU?LRFMSPJWSNB?RCQMLKWFMKCN?EC MFNJC?QCUGJJWMSFCJNKC cache 'homepage', expires_in: 1.hour do 53 / 58
- 55. 3FGQRFGLEBMCQLRSNB?RC GU?LR?@SRRML RMLSICCTCPWRFGLE class NukesController def create expire_fragment('homepage'); end end 54 / 58
- 56. 'MUUCJJGQGRUMPIGLEDMPSQ 55 / 58
- 57. 6FCPCRMEMDPMKFCPC ?AFGLEUGRF1?GJQ LMTCPTGCU (BCLRGRW?AFC ,SJRGDCRAF%P?EKCLRQ 2CAMLB+CTCJ?AFC 56 / 58
- 58. 3F?LIWMS 57 / 58
- 59. 58 / 58