graph.rb

require 'gruff'

concurrencies = { 
  0 => "1",
  1 => "10",
  2 => "20",
  3 => "50",
  4 => "100"
}

titles = [ 
  { key: :request, description: "Requests per second" },
  { key: :time,    description: "Time per request"    }   
]

targets = [ 
  { host: "test1.com", description: "php-fpm + nginx"     },  
  { host: "test2.com", description: "php-fpm + apache2.2" },
  { host: "test3.com", description: "apache2.2 (mod_php)" },
  { host: "test4.com", description: "php-fpm + apache2.4" },
  { host: "test5.com", description: "apache2.4 (mod_php)" }
]

loop_count    = 1 
request_times = 1000

titles.each do |title|
  regex = (title[:key] == :request) ? /Requests per second:\s*(.+?) \[/ : /Time per request:\s*(.+?) \[ms\] \(mean\)/

  targets.each do |target|
    target[:results] = concurrencies.values.map do |concurrency|
      results = []

      loop_count.times do
        `ab -n #{request_times} -c #{concurrency} http://#{target[:host]}/bench.php` =~ regex
        results << $1.to_f
      end 

      average = results.map(&:to_f).inject(0.0) { |r, i| r += i } / results.size
      ("%0.2f" % average).to_f
    end 
  end 

  # targets = [{:host=>"test1.com", :description=>"php-fpm + nginx", :results=>["40.89", "190.78", "270.74"]}, {:host=>"test2.com", :description=>"php-fpm + apache2.2", :results=>["29.81", "176.78", "217.16"]}, {:host=>"test3.com", :description=>"apache2.2 (mod_php)", :results=>["30.20", "165.30", "205.03"]}, {:host=>"test4.com", :description=>"php-fpm + apache2.4", :results=>["28.70", "158.23", "217.65"]}, {:host=>"test5.com", :description=>"apache2.4 (mod_php)", :results=>["41.54", "169.19", "265.83"]}]
  
  # output STDOUT 
  puts title[:description]
  targets.each do |target|
    puts "#{target[:description]}, #{target[:results]}"
  end

  # create graph
  g = Gruff::Line.new
  g.title = title[:description]

  targets.each do |target|
    g.data(target[:description], target[:results])
  end

  g.labels = concurrencies

  file_name = "#{title[:key]}_#{Time.now.strftime("%Y%m%d-%H%M%S")}.png"
  g.write(file_name)
end