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docs git-subtree-split: 39af43ef11c23b8eaea7e17b59ff065a169305ac
87 lines
3.6 KiB
Markdown
87 lines
3.6 KiB
Markdown
---
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title: Build Performance
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description: An overview of features used for diagnosing and improving performance issues in site builds.
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menu:
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docs:
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parent: troubleshooting
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weight: 3
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toc: true
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---
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## Template Metrics
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Hugo is a very fast static site generator, but it is possible to write
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inefficient templates. Hugo's _template metrics_ feature is extremely helpful
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in pinpointing which templates are executed most often and how long those
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executions take **in terms of CPU time**.
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| Metric Name | Description |
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| ------------------- | -------------------------------------------------------------- |
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| cumulative duration | The cumulative time spent executing a given template. |
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| average duration | The average time spent executing a given template. |
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| maximum duration | The maximum time a single execution took for a given template. |
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| count | The number of times a template was executed. |
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| template | The template name. |
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```txt
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▶ hugo --templateMetrics
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Started building sites ...
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Built site for language en:
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0 draft content
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0 future content
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0 expired content
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2 regular pages created
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22 other pages created
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0 non-page files copied
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0 paginator pages created
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4 tags created
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3 categories created
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total in 18 ms
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Template Metrics:
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cumulative average maximum
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duration duration duration count template
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---------- -------- -------- ----- --------
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6.419663ms 583.605µs 994.374µs 11 _internal/_default/rss.xml
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4.718511ms 1.572837ms 3.880742ms 3 indexes/category.html
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4.642666ms 2.321333ms 3.282842ms 2 posts/single.html
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4.364445ms 396.767µs 2.451372ms 11 partials/header.html
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2.346069ms 586.517µs 903.343µs 4 indexes/tag.html
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2.330919ms 211.901µs 2.281342ms 11 partials/header.includes.html
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1.238976ms 103.248µs 446.084µs 12 posts/li.html
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972.16µs 972.16µs 972.16µs 1 _internal/_default/sitemap.xml
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953.597µs 953.597µs 953.597µs 1 index.html
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822.263µs 822.263µs 822.263µs 1 indexes/post.html
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567.498µs 51.59µs 112.205µs 11 partials/navbar.html
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348.22µs 31.656µs 88.249µs 11 partials/meta.html
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346.782µs 173.391µs 276.176µs 2 posts/summary.html
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235.184µs 21.38µs 124.383µs 11 partials/footer.copyright.html
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132.003µs 12µs 117.999µs 11 partials/menu.html
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72.547µs 6.595µs 63.764µs 11 partials/footer.html
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```
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{{% note %}}
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**A Note About Parallelism**
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Hugo builds pages in parallel where multiple pages are generated
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simultaneously. Because of this parallelism, the sum of "cumulative duration"
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values is usually greater than the actual time it takes to build a site.
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{{% /note %}}
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## Cached Partials
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Some `partial` templates such as sidebars or menus are executed many times
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during a site build. Depending on the content within the `partial` template and
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the desired output, the template may benefit from caching to reduce the number
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of executions. The [`partialCached`][partialcached] template function provides
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caching capabilities for `partial` templates.
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{{% note %}}
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Note that you can create cached variants of each `partial` by passing additional
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parameters to `partialCached` beyond the initial context. See the
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`partialCached` documentation for more details.
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{{% /note %}}
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[partialCached]: /functions/partialcached
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