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Estratégias para tunar sua aplicação rails
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Cirdes
November 29, 2014
Programming
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Estratégias para tunar sua aplicação rails
Palestra na RuPy 2014
Cirdes
November 29, 2014
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Transcript
ESTRATÉGIASDE CACHE PARA TUNAR SUA APLICAÇÃO RAILS
CIRDES HENRIQUE ENGENHEIRO DA COMPUTAÇÃO - UFPE ORGANIZADOR DO ABRIL
PRO RUBY C0-FUNDADOR E DEV DO EVENTICK
None
335 MIL TICKETS EMITIDOS 3600 ORGANIZADORES 1200 EVENTOS FUTUROS
RECIFE
RECIFE
O EVENTICK FICOU FORA DO AR POR 30 MINUTOS
ANTES DA SOLUÇÃO, UM PASSO ATRÁS: MONITORAR A APLICAÇÃO
NewRelic Nazar.io HoneyBadger Logentries Inspectlet The Informant
SOA?
SINGLE RAILS APP LIKE SHOPIFY
70% DAS REQUISIÇÕES BATEM NA CACHE
O QUE É CACHE?
Cache é um componente que guarda informações de forma TRANSPARENTE
para que futuras requisições sejam mais RÁPIDAS
QUAL A CARACTERÍSTICA DA CACHE?
O QUE USA CACHE?
DO QUE É CONSTITUÍDA UMA CACHE?
CACHE = CASH
ARQUITETURA DE MEMÓRIA
CACHE HIT / CACHE MISS / CACHE RATIO
COMO MAXIMIZAR O CACHE HIT?
BÉLÁDY’S ALGORITHM
RANDOM REPLACEMENT (RR)
LEAST-FREQUENTLY USED (LFU)
LEAST-RECENTLY USED (LRU)
O QUE É WEBCACHING?
REQUISIÇÃO Rails App Reverse Proxy CDN Proxy Browser
CACHE SERVER-SIDE CACHE CLIENT-SIDE
PAGE CACHE ACTION CACHE FRAGMENT CACHE RAILS CACHE
WRITE ON DISK BYPASS RAILS APPLICATION ENTIRE STATELESS PAGES NÃO
FUNCIONA NO HEROKU PAGE CACHE
PAGE CACHE class WeblogController < ActionController::Base caches_page :show, :new def
update expire_page action: 'show', id: params[:list][:id] end end
SIMILAR TO PAGE CACHE RUN FILTERS ACTION CACHE
ACTION CACHE class PostsController < ActionController::Base caches_action :show, expires_in: 1.hour
end
DEPRECATED
HTML CACHE AVAILABLE IN RAILS 4 FRAGMENT CACHE
RAILS CACHE FRAGMENT AND ACTION CACHE BUILD ON RAILS.CACHE CONFIG.ACTION_CONTROLLER.PERFORM_CACHING
= TRUE
ActiveSupport::Cache::Store FileStore MemoryStore NullStore MemCacheStore
HOW TO USE IT Rails.cache.write 'foo', 'bar' Rails.cache.fetch 'foo' Rails.cache.write
:foo, {a: 'b'}
FRAGMENT CACHING Rais.cache.fetch 'key', expires_in: 5.minutes, race_condition_ttl: 10.seconds do #code
end
FRAGMENT CACHING <% cache "event-#{event.id}" do %> <%= render event
%> <% end %>
FRAGMENT CACHING <% cache “event-#{event.id}”, expires_in: 1.year do %> <%=
render event %> <% end %>
FRAGMENT CACHING def update expire_fragment("event-#{event.id}") end
FRAGMENT CACHING <% cache [:recent, event] do %> <%= render
event %> <% end %>
FRAGMENT CACHING ACTIVESUPPORT::CACHE.EXPAND_CACHE_KEY [:RECENT, EVENT] => "RECENT/EVENTS/12510-20141128131506743910000"
FRAGMENT CACHING <% cache :recent_attendees, expires_in: 5.minutes do %> <%=
render partial: 'recent', collection: Attendees.recent %> <% end %>
FRAGMENT CACHING <% cache(cache_key_for_attendees) do %> <%= render partial: 'recent',
collection: Attendees.recent %> <% end %>
FRAGMENT CACHING module AttendeesHelper def cache_key_for_attendees count = Attendee.count max_updated_at
= Attendee.maximum(:updated_at).try(:utc).try(:to_s, :number) "attendees/all-#{count}-#{max_updated_at}" end end
FRAGMENT CACHING <% cache(cache_key_for_attendees) do %> <%= render partial: 'recent',
collection: Attendees.recent %> <% end %>
PROBLEMA COM TEMPLATE
CACHE Digests <!-- app/views/events/show.html.erb --> <% cache ["v1", @event] do%>
<h1>Team: <%= @event.title %></h1> <%= render @event.attendees %> <% end %> <!-- app/views/attendees/_attendee.html.erb --> <% cache ["v1", attendee] do %> <span><%= attendee.name %></span> <span><%= attendee.email %></span> <% end %>
CACHE Digests
CACHE Digests
RUSSIAN DOLL
Russian Doll
Russian Doll <% cache(cache_key_for_attendees) do %> All available attendees: <%
Attendee.all.each do |a| %> <% cache(a) do %> <p><%= a.name %></p> <% end %> <% end %> <% end %>
KNOWING IS NOT ENOUGH WE MUST APPLY
WILLING IS NOT ENOUGH WE MUST DO