optimize task 4

.gitignore

@@ -43,6 +43,8 @@ latest.dump
 /public/packs-test
 /node_modules
 config/database.yml
+/config/newrelic.yml
+
 
 # Ignore storybook static site generation
 storybook-static/

Gemfile

@@ -62,6 +62,7 @@ gem "jquery-rails", "~> 4.3"
 gem "kaminari", "~> 1.1"
 gem "libhoney", "~> 1.11"
 gem "liquid", "~> 4.0"
+gem 'newrelic_rpm'
 gem "nokogiri", "~> 1.10"
 gem "octokit", "~> 4.13"
 gem "omniauth", "~> 1.9"
@@ -75,6 +76,7 @@ gem "pundit", "~> 2.0"
 gem "pusher", "~> 1.3"
 gem "pusher-push-notifications", "~> 1.0"
 gem "rack-host-redirect", "~> 1.3"
+gem 'rack-mini-profiler'
 gem "rack-timeout", "~> 0.5"
 gem "rails", "~> 5.1.6"
 gem "rails-assets-airbrake-js-client", "~> 1.5", source: "https://rails-assets.org"

Gemfile.lock

@@ -646,9 +646,12 @@ GEM
     net-smtp (0.5.1)
       net-protocol
     netrc (0.11.0)
+    newrelic_rpm (9.17.0)
     nio4r (2.7.4)
     nokogiri (1.15.7-aarch64-linux)
       racc (~> 1.4)
+    nokogiri (1.15.7-x86_64-linux)
+      racc (~> 1.4)
     notiffany (0.1.3)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -726,6 +729,8 @@ GEM
     rack (2.2.11)
     rack-host-redirect (1.3.0)
       rack
+    rack-mini-profiler (3.3.1)
+      rack (>= 1.2.0)
     rack-protection (2.2.4)
       rack
     rack-proxy (0.7.7)
@@ -1011,6 +1016,7 @@ GEM
 
 PLATFORMS
   aarch64-linux
+  x86_64-linux
 
 DEPENDENCIES
   actionpack-action_caching (~> 1.2)
@@ -1081,6 +1087,7 @@ DEPENDENCIES
   liquid (~> 4.0)
   memory_profiler (~> 0.9)
   nakayoshi_fork
+  newrelic_rpm
   nokogiri (~> 1.10)
   octokit (~> 4.13)
   omniauth (~> 1.9)
@@ -1098,6 +1105,7 @@ DEPENDENCIES
   pusher (~> 1.3)
   pusher-push-notifications (~> 1.0)
   rack-host-redirect (~> 1.3)
+  rack-mini-profiler
   rack-timeout (~> 0.5)
   rails (~> 5.1.6)
   rails-assets-airbrake-js-client (~> 1.5)!

app/views/stories/_main_stories_feed.html.erb

@@ -55,7 +55,9 @@
     <% if !user_signed_in? && i == 4 %>
       <%= render "stories/sign_in_invitation" %>
     <% end %>
-    <%= render "articles/single_story", story: story %>
+    <%= cache ['single_story', story], expires_in: 24.hours do %>
+      <%= render "articles/single_story", story: story %>
+    <% end %>
   <% end %>
 <% end %>
 <% if @stories.size > 1 %>

case-study.md

@@ -0,0 +1,41 @@
+# Case-study оптимизации
+
+ApacheBench:
+```
+Concurrency Level:      5
+Time taken for tests:   47.600 seconds
+Complete requests:      100
+Failed requests:        0
+Total transferred:      15984100 bytes
+HTML transferred:       15937400 bytes
+Requests per second:    2.10 [#/sec] (mean)
+Time per request:       2380.021 [ms] (mean)
+Time per request:       476.004 [ms] (mean, across all concurrent requests)
+Transfer rate:          327.93 [Kbytes/sec] received
+
+```
+В задаче имеется подсказка, что заметное время занимает рендеринг partial-ов single_story.html.erb. Однако я этого не увидела
+
+**rack-mini-profiler** показывает первую загрузку страницы за 7480ms, повторные же в пределах 700ms из-за встроенных кэшей
+Наибольшее время (2250ms) `articles/_sidebar.html.erb`
+
+**New Relic**
+Web transactions time - 2600ms из них ruby занимает 2008ms.
+most time consuming - stories#index
+stories#index  - 790ms
+layouts/application.html.erb - 624ms
+single_story.html.erb - 206ms
+articles/sidebar.html.erb - 120ms
+
+Я  закэшировала single_story, тогда
+ApacheBench
+```
+Requests per second:    7.16 [#/sec] (mean)
+Time per request:       698.126 [ms] (mean)
+Time per request:       139.625 [ms] (mean, across all concurrent requests)
+Transfer rate:          1121.84 [Kbytes/sec] received
+```
+
+**rack-mini-profiler** показывает время загрузки 350ms
+Время загрузки по **NewRelic** тоже уменьшилось, см скриншот.
+Но почему это работает - я не понимаю, ведь single_story не выглядела как основная точка роста.