> For the complete documentation index, see [llms.txt](https://kelby.gitbook.io/rails-beginner-s-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kelby.gitbook.io/rails-beginner-s-guide/activesupport/actiondispatch_-_benchmarkable_.md).

# Benchmarkable

**耗时统计**

执行某程序，用了多少时间？

```
benchmark
```

使用举例：

```ruby
<% benchmark 'Process data files', level: :info, silence: true do %>
  <%= expensive_and_chatty_files_operation %>
<% end %>
```

可先用 gem 'newrelic' 等大致定位，然后使用 benchmark 实现精确定位。

链接 [标准库 Benchmark](http://ruby-doc.org/stdlib-2.2.0/libdoc/benchmark/rdoc/Benchmark.html)