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2.066s 1.750s 1.654s 1.504s 1.476s 1.392s 1.388s 1.237s 1.222s 1.219s
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CHAPTER 13 PERFORMANCE OPTIMIZATION
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DB Times Summary: ALL REQUESTS: Unknown: CatalogController#index: CatalogController#show: AboutController#index:
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Count 266 197 28 21 20
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Avg 0.006 0.000 0.052 0.003 0.000
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Std Dev Min 0.019 0.000 0.000 0.032 0.012 0.000 0.000 0.024 0.000 0.000
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Max 0.165 0.000 0.165 0.057 0.001
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Slowest Total DB Times: CatalogController#index took 0.165s CatalogController#index took 0.156s CatalogController#index took 0.077s CatalogController#index took 0.063s CatalogController#index took 0.062s CatalogController#index took 0.058s CatalogController#index took 0.057s CatalogController#show took 0.057s CatalogController#index took 0.054s CatalogController#index took 0.054s ----------------------------------------------------------------------Render Times Summary: ALL REQUESTS: Unknown: CatalogController#index: CatalogController#show: AboutController#index: Slowest Total Render Times: CatalogController#index CatalogController#index CatalogController#index CatalogController#index CatalogController#index CatalogController#index CatalogController#index CatalogController#index CatalogController#index CatalogController#index Count 266 197 28 21 20 Avg 0.099 0.000 0.915 0.018 0.020 Std Dev Min 0.306 0.000 0.000 0.377 0.079 0.010 0.000 0.429 0.000 0.013 Max 1.934 0.000 1.934 0.371 0.055
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1.934s 1.554s 1.524s 1.403s 1.396s 1.266s 1.208s 1.122s 1.102s 1.100s
CHAPTER 13 PERFORMANCE OPTIMIZATION
The first listing in the output is a summary of the complete request times. After that are similar summaries for the times needed in the database and for the rendering. A summary lists the different requested actions, the count of times they were requested, and the statistics of their performance (including average, minimum, and maximum times and the standard deviation). From this listing, it is pretty easy to see which actions tend to be the slowest. If a slow action is also a very popular action, it is a good candidate for being optimized in one way or another. Following the statistical analysis is a list of the slowest individual action loads in each category. An astute reader can see that the slowest request time should match the Max field value in the ALL REQUESTS row in the statistical analysis. From the analysis, you can see that the three actions that had been requested are pretty much equally popular. However, the index page in CatalogController is clearly the slowest, and its request times are more than one second on average. Next, take a look at what happens in the action by using the action_grep command included in the Production Log Analyzer package: $ sudo action_grep CatalogController#index /var/log/production.log Sep 28 12:17:50 emporium rails[10500]: Processing CatalogController#index (for 81.193.72.157 at 2006-09-28 12:17:50) [GET] Sep 28 12:17:50 emporium rails[10500]: Session ID: ba0a2e9b205ed0da9390dc08ea00d114 Sep 28 12:17:50 emporium rails[10500]: Parameters: {"action"=>"index", "controller"=>"catalog"} Sep 28 12:17:50 emporium rails[10500]: Globalize::Language Columns (0.002259) SHOW FIELDS FROM globalize_languages Sep 28 12:17:50 emporium rails[10500]: Globalize::Language Load (0.000155) SELECT * FROM globalize_languages WHERE (globalize_languages.`iso_639_1` = 'en' ) LIMIT 1 Sep 28 12:17:50 emporium rails[10500]: Cart Load (0.000108) SELECT * FROM carts WHERE (carts.id = 107) LIMIT 1 Sep 28 12:17:50 emporium rails[10500]: Book Count (0.000156) SELECT COUNT(DISTINCT books.id) FROM books LEFT OUTER JOIN authors_books ON authors_books.book_id = books.id LEFT OUTER JOIN authors ON authors.id =authors_books.author_id LEFT OUTER JOIN publishers ON publishers.id = books.publisher_id Sep 28 12:17:50 emporium rails[10500]: Globalize::Language Load (0.000650) SELECT * FROM globalize_languages WHERE (globalize_languages.`rfc_3066` = 'en-US' ) LIMIT 1 Sep 28 12:17:50 emporium rails[10500]: Globalize::Language Load (0.000140) SELECT * FROM globalize_languages WHERE (globalize_languages.`iso_639_1` = 'en' ) LIMIT 1 Sep 28 12:17:50 emporium rails[10500]: Book Columns (0.002050) SHOW FIELDS FROM books Sep 28 12:17:50 emporium rails[10500]: Author Columns (0.001774) SHOW FIELDS FROM authors
CHAPTER 13 PERFORMANCE OPTIMIZATION
Sep 28 12:17:50 emporium rails[10500]: Publisher Columns (0.001681) SHOW FIELDS FROM publishers Sep 28 12:17:50 emporium rails[10500]: Book Load IDs For Limited Eager Loading (0.000133) SELECT id FROM books ORDER BY books.id desc LIMIT 0, 10 The command gives a lot of output about what has been happening in the index actions in CatalogController. You can see that most of the database traffic is related to the Globalize plugin. However, if you take a closer look at the Production Log Analyzer output, you will see that most of the time is not spent in the database, but in rendering the page (0.052 second vs. 0.915 second). We should find out what is taking so much time in rendering the page. And that s where Action Profiler comes in.
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