#150 Rails Metal

Feb 23, 2009 | 9 minutes | Performance, Rails 2.3

Rails Metal is a way to bypass the standard Rails request process for a performance boost. In this episode you will learn how to shave off a few milliseconds using Metal.

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There is a newer version of this episode, see the revised episode.

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          bash
        
script/generate metal processes_list
script/server -e production -d
ab -n 100 http://127.0.0.1:3000/processes/list
ab -n 100 http://127.0.0.1:3000/processes_list

          app/metal/processes_list.rb
        
require(File.dirname(__FILE__) + "/../../config/environment") unless defined?(Rails)

class ProcessesList
  def self.call(env)
    if env["PATH_INFO"] =~ /^\/processes_list/
      [200, {"Content-Type" => "text/html"}, [`ps -axcr -o "pid,pcpu,pmem,time,comm"`]]
    else
      [404, {"Content-Type" => "text/html"}, ["Not Found"]]
    end
  end
end

          processes/index.html.erb
        
<pre id="processes">Gathering processes...</pre>

<%= periodically_call_remote :url => "/processes_list", :update => "processes", :frequency => 3, :method => :get %>