Homework 3 #120
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Homework 3 #120
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spajic
approved these changes
Feb 28, 2025
| @@ -1,3 +1,11 @@ | |||
| # == Schema Information | |||
| # | ||
| # Indexes | ||
| # | ||
| # index_trips_on_from_id_and_to_id (from_id,to_id) |
| @@ -25,7 +41,7 @@ def to_h | |||
| bus: { | |||
| number: bus.number, | |||
| model: bus.model, | |||
| services: bus.services.map(&:name), | |||
| services: bus.services.pluck(:name), | |||
| def connection | ||
| @connection ||= ActiveRecord::Base.connection.raw_connection | ||
| end | ||
| end |
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| Для удобства работы с моделями добавил gem annotate. | ||
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| Перед началом оптимизации написал тест который позволит контролировать что после изменений скрипт работает валидно(spec/services/reloader_spec.rb). |
| * {"3.4.1":{"gc":"enabled","time":0.56,"gc_count":24,"memory":"14 MB"}} - medium.json | ||
| * {"3.4.1":{"gc":"enabled","time":2.6,"gc_count":243,"memory":"15 MB"}} - large.json | ||
| * {"3.4.1":{"gc":"enabled","time":24.16,"gc_count":586,"memory":"32 MB"}} - 1M.json | ||
| * {"3.4.1":{"gc":"enabled","time":222.63,"gc_count":5441,"memory":"18 MB"}} - 10M.json |
| * medium.json - 804ms | ||
| * large.json - 5800ms | ||
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| Добавил тесты для проверки конторллера и элементов страницы. |
| Добавил тесты для проверки конторллера и элементов страницы. | ||
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| ## Поиск точек роста | ||
| - `rack-mini-profiler` показывает более 1700 sql запросов при рендере страницы |
| Время загрузки уменьшилось до 1300ms. | ||
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| - В `rack-mini-profiler` вижу два запроса в таблице cities по name. | ||
| Понимаю, что из-за количества запросов добавление индекса не очень скажется на перформансе. |
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да, тут с точки зрения времени рендеринга страницы по профилировщико понятно что ускорения за счёт индексов не добиться
но если бы мы решали задачу оптимизировать БД, то там бы такие индексы могли бы помочь
| <% end %> | ||
| <ul> | ||
| <%= render partial: "trip", collection: @trips, as: :trip %> | ||
| ==================================================== |
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Есть забавная возможность задать spacer параметром: https://guides.rubyonrails.org/layouts_and_rendering.html#spacer-templates
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