Use siege to benchmark specific routes in your app.

coordinated_siege.rb

#!/usr/bin/env ruby

if ARGV.empty?
  warn "Need a list of URLs to benchmark"
  exit 1
end

class Siege
  REQUESTS = 10
  CONCURRENCY = 1

  attr_reader :url

  def initialize(url)
    @url = url
  end

  def attack!
    parse_results `siege -c#{CONCURRENCY} -r#{REQUESTS} \"#{url}\" 2>&1`
    print_result
    STDOUT.flush
  end

  # ** SIEGE 2.71
  # ** Preparing 1 concurrent users for battle.
  # The server is now under siege..      done.
  #
  # Transactions:              4 hits
  # Availability:         100.00 %
  # Elapsed time:           2.38 secs
  # Data transferred:         0.02 MB
  # Response time:            0.60 secs
  # Transaction rate:         1.68 trans/sec
  # Throughput:           0.01 MB/sec
  # Concurrency:            1.00
  # Successful transactions:           4
  # Failed transactions:             0
  # Longest transaction:          0.60
  # Shortest transaction:         0.59

  def parse_results(results)
    @results = results.lines
    @transactions = parse_value('Transactions').to_i
    @average_response = parse_value('Response time').to_f
    @longest_response = parse_value('Longest transaction').to_f
    @shortest_response = parse_value('Shortest transaction').to_f
    @successes = parse_value('Successful transactions').to_i
    @failures = parse_value('Failed transactions').to_i
  end

  def parse_value(label)
    @results.grep(%r{^#{label}:}).first.split(':')[1].strip
  end

  def print_result
    puts "#{url},#{@average_response},#{@shortest_response},#{@longest_response},#{@transactions},#{@successes},#{@failures}"
  end
end

# Chop a file into urls
def urls_to_array(text)
  text.lines.reject { |line| line.start_with?('#') }.map(&:chomp)
end


# Print CSV header
puts %w[url avg min max reqs succ fail].join(',')
urls_to_array(ARGF).each { |url| Siege.new(url).attack! }