rails_watcher

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Help you benchmark / analyze / understand your Rails application.

rails_watcher 최신버젼 다운로드

최종 버전 다운로드 (.zip)

// repository documentation

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# Rails Watcher
Help you benchmark / analyze / understand your Rails application.

## Usage
Add `rails_watcher` to your `Gemfile`.

```ruby
# rails_watcher will slow down your application, suggest only enable on development environment.
gem 'rails_watcher', require: ENV['RAILS_WATCHER'], group: :development
```

Start your Rails application with `RAILS_WATCHER`.
```sh
$ RAILS_WATCHER=true rails s
```

Then make some requests to your application, if the response time slow than 10 ms (could be configured), `Rails Watcher` will capture the all details for your request.

By default, `Rails Watcher` will save captured data to `#{Rails.root}/tmp/rails_watcher`.

## View Result
If you use default configuration of `Rails Watcher`, you could use `rails_watcher_viewer` to view result:
```sh
$ gem install -N rails_watcher_viewer
$ cd application_folder/tmp/rails_watcher
$ rails_watcher_viewer
```
View `localhost:4567`, you could see the list of your requests:
![list](https://raw.githubusercontent.com/piecehealth/rails_watcher/master/list.png)
You can navigate to details page, the `Expensive methods` table show the slow methods ordered by `net cost`:
![detail1](https://raw.githubusercontent.com/piecehealth/rails_watcher/master/detail1.png)
### How to calculate `net cost`
```ruby
@a = 1
def sample_method
  sleep @a
  inner_method()
  @a += 1
end

def inner_method
  sleep @a * 3
end

sample_method() # will take 1 + 3 = 4 seconds
sample_method() # will take 2 + 6 = 8 seconds
```
The net cost of sample_method should be 1 + 2 = 3 seconds, the total cost of sample_method should be 4 + 8 = 12 seconds.

![detail2](https://raw.githubusercontent.com/piecehealth/rails_watcher/master/detail2.png)
The `Call Stack` section show the call stacks of your application.
Please notice that, it only show the methods inside your application plus any methods you want to watch, which means the Ruby build-in methods and methods inside any gem will not be captured by default. It is great helpful for trouble shooting.

## License
The gem is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT).

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