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diff --git a/docs/content/en/troubleshooting/build-performance.md b/docs/content/en/troubleshooting/build-performance.md new file mode 100644 index 000000000..e0700f381 --- /dev/null +++ b/docs/content/en/troubleshooting/build-performance.md @@ -0,0 +1,101 @@ +--- +title: Build Performance +linktitle: Build Performance +description: An overview of features used for diagnosing and improving performance issues in site builds. +date: 2017-03-12 +publishdate: 2017-03-12 +lastmod: 2017-03-12 +keywords: [performance, build] +categories: [troubleshooting] +menu: + docs: + parent: "troubleshooting" +weight: 3 +slug: +aliases: [] +toc: true +--- + +{{% note %}} +The example site used below is from https://github.com/gohugoio/hugo/tree/master/examples/blog +{{% /note %}} + +## Template Metrics + +Hugo is a very fast static site generator, but it is possible to write +inefficient templates. Hugo's *template metrics* feature is extremely helpful +in pinpointing which templates are executed most often and how long those +executions take **in terms of CPU time**. + +| Metric Name | Description | +|---------------------|-------------| +| cumulative duration | The cumulative time spent executing a given template. | +| average duration | The average time spent executing a given template. | +| maximum duration | The maximum time a single execution took for a given template. | +| count | The number of times a template was executed. | +| template | The template name. | + +``` +▶ hugo --templateMetrics +Started building sites ... + +Built site for language en: +0 draft content +0 future content +0 expired content +2 regular pages created +22 other pages created +0 non-page files copied +0 paginator pages created +4 tags created +3 categories created +total in 18 ms + +Template Metrics: + + cumulative average maximum + duration duration duration count template + ---------- -------- -------- ----- -------- + 6.419663ms 583.605µs 994.374µs 11 _internal/_default/rss.xml + 4.718511ms 1.572837ms 3.880742ms 3 indexes/category.html + 4.642666ms 2.321333ms 3.282842ms 2 posts/single.html + 4.364445ms 396.767µs 2.451372ms 11 partials/header.html + 2.346069ms 586.517µs 903.343µs 4 indexes/tag.html + 2.330919ms 211.901µs 2.281342ms 11 partials/header.includes.html + 1.238976ms 103.248µs 446.084µs 12 posts/li.html + 972.16µs 972.16µs 972.16µs 1 _internal/_default/sitemap.xml + 953.597µs 953.597µs 953.597µs 1 index.html + 822.263µs 822.263µs 822.263µs 1 indexes/post.html + 567.498µs 51.59µs 112.205µs 11 partials/navbar.html + 348.22µs 31.656µs 88.249µs 11 partials/meta.html + 346.782µs 173.391µs 276.176µs 2 posts/summary.html + 235.184µs 21.38µs 124.383µs 11 partials/footer.copyright.html + 132.003µs 12µs 117.999µs 11 partials/menu.html + 72.547µs 6.595µs 63.764µs 11 partials/footer.html +``` + +{{% note %}} +**A Note About Parallelism** + +Hugo builds pages in parallel where multiple pages are generated +simultaneously. Because of this parallelism, the sum of "cumulative duration" +values is usually greater than the actual time it takes to build a site. +{{% /note %}} + + +## Cached Partials + +Some `partial` templates such as sidebars or menus are executed many times +during a site build. Depending on the content within the `partial` template and +the desired output, the template may benefit from caching to reduce the number +of executions. The [`partialCached`][partialCached] template function provides +caching capabilities for `partial` templates. + +{{% tip %}} +Note that you can create cached variants of each `partial` by passing additional +parameters to `partialCached` beyond the initial context. See the +`partialCached` documentation for more details. +{{% /tip %}} + + +[partialCached]:{{< ref "/functions/partialCached.md" >}} |