drawohara - Rails components are slow?

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drawohara @twatter

Rails components are slow?

It’s been said on the net that Rails’ components are slow - to the point of being unusable. However, this quick, and admittedly incomplete, test seems to indicate little difference for this simple example. Note that the example uses the compoentry.rb code I outlined in this post.

### simple controller
class BarController < ApplicationController
  def initialize
    @foo = 42
    @bar = ‘forty-two’
  end
  def foo
    render :text => @foo
  end
  def bar
    render :text => @bar
  end
  def foobar
    render :text => [@foo, @bar].inspect #=> [42, “forty-two”]
  end
end

### benchmarking
cfp:~/src/ruby/componentry/componentry-0.0.0/sample/rails > ab -n 25 -c 4 http://localhost:3000/bar/foobar|grep ‘Requests’
Requests per second: 7.05 [#/sec] (mean)

### controller which uses the the BarController via components
class FooController < ApplicationController
  def foobar
    # get a handle on, and parameterize, a bar controller
    bar_controller = component_for(:controller => ‘bar’) do
      @foo = 42
      @bar = ‘forty-two’
    end

    # call two actions on the bar controller, reusing the entire
    # model+view+controller
    foo = bar_controller.content_for :action => ‘foo’
    bar = bar_controller.content_for :action => ‘bar’

    render :text => [foo, bar].inspect #=> [42, “forty-two”]
  end
end

### benchmarking
cfp:~/src/ruby/componentry/componentry-0.0.0/sample/rails > ab -n 25 -c 4 http://localhost:3000/foo/foobar|grep ‘Requests’
Requests per second: 6.79 [#/sec] (mean)

So, in my mind, this seems to at least suggest that the above two requests, one with and one without components, are essentially the same. My reading of the rails source doesn’t show any significant work being done when components are used, many objects are dup’d when possible, so this makes sense to me.

Do you have code showing that they are significantly slower? If so drop me a line at ara[dot]t[dot]howard[at]gmail[dot]com.

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