rails_3_2_middleware_cost_check.rb

require 'benchmark'

CYCLES = 1_000_000

app = lambda do |env| 
 [
   200,
   { 'Content-Type' => 'text/html' },
   ['Hello World']
 ]
end

Benchmark.bmbm do |x|
  x.report('base') { CYCLES.times { app.call({}) } }
  x.report('ActionDispatch::RequestId') { r = ActionDispatch::RequestId.new(app); CYCLES.times { r.call({}) } }
  x.report('ActionDispatch::Callbacks') { r = ActionDispatch::Callbacks.new(app); CYCLES.times { r.call({}) } }
  x.report('ActionDispatch::DebugExceptions') { r = ActionDispatch::DebugExceptions.new(app); CYCLES.times { r.call({}) } }
  x.report('ActionDispatch::ShowExceptions') { r = ActionDispatch::ShowExceptions.new(app, app); CYCLES.times { r.call({}) } }
  x.report('ActionDispatch::DebugExceptions') { r = ActionDispatch::DebugExceptions.new(app); CYCLES.times { r.call({}) } }
  x.report('ActionDispatch::Session::CookieStore') { r = ActionDispatch::Session::CookieStore.new(app); CYCLES.times { r.call({}) } }
  x.report('ActionDispatch::Head') { r = ActionDispatch::Head.new(app); CYCLES.times { r.call({}) } }
  x.report('ActionDispatch::BestStandardsSupport') { r = ActionDispatch::BestStandardsSupport.new(app); CYCLES.times { r.call({}) } }
  x.report('Rack::ConditionalGet') { r = Rack::ConditionalGet.new(app); CYCLES.times { r.call({}) } }
  x.report('Rack::ETag') { r = Rack::ETag.new(app); CYCLES.times { r.call({}) } }
  x.report('Rack::Runtime') { r = Rack::Runtime.new(app); CYCLES.times { r.call({}) } }
  x.report('Log4rExceptionable::RackFailureHandler') { r = Log4rExceptionable::RackFailureHandler.new(app); CYCLES.times { r.call({}) } }
  x.report('Honeybadger::UserInformer') { r = Honeybadger::UserInformer.new(app); CYCLES.times { r.call({}) } }
  x.report('Honeybadger::UserFeedback') { r = Honeybadger::UserFeedback.new(app); CYCLES.times { r.call({}) } }
  x.report('Honeybadger::Rack') { r = Honeybadger::Rack.new(app); CYCLES.times { r.call({}) } }
end

results.txt

Rehearsal --------------------------------------------------------------------------
base                                     1.380000   0.040000   1.420000 (  1.220000)
ActionDispatch::RequestId               23.580000   1.840000  25.420000 ( 25.243000)
ActionDispatch::Callbacks               15.950000   0.030000  15.980000 ( 15.908000)
ActionDispatch::DebugExceptions          2.620000   0.000000   2.620000 (  2.578000)
ActionDispatch::ShowExceptions           1.360000   0.010000   1.370000 (  1.347000)
ActionDispatch::DebugExceptions          2.580000   0.000000   2.580000 (  2.571000)
ActionDispatch::Session::CookieStore    10.520000   0.000000  10.520000 ( 10.441000)
ActionDispatch::Head                     1.650000   0.010000   1.660000 (  1.608000)
ActionDispatch::BestStandardsSupport     1.990000   0.010000   2.000000 (  1.972000)
Rack::ConditionalGet                     1.820000   0.020000   1.840000 (  1.828000)
Rack::ETag                              14.730000   0.000000  14.730000 ( 14.640000)
Rack::Runtime                           12.060000   0.000000  12.060000 ( 11.977000)
Log4rExceptionable::RackFailureHandler   3.980000   0.010000   3.990000 (  3.946000)
Honeybadger::UserInformer                2.080000   0.000000   2.080000 (  2.027000)
Honeybadger::UserFeedback                3.050000   0.000000   3.050000 (  3.000000)
Honeybadger::Rack                        3.490000   0.000000   3.490000 (  3.451000)
--------------------------------------------------------------- total: 104.810000sec

                                             user     system      total        real
base                                     1.220000   0.000000   1.220000 (  1.177000)
ActionDispatch::RequestId               23.380000   2.110000  25.490000 ( 25.412000)
ActionDispatch::Callbacks               16.140000   0.010000  16.150000 ( 15.897000)
ActionDispatch::DebugExceptions          2.630000   0.000000   2.630000 (  2.605000)
ActionDispatch::ShowExceptions           1.390000   0.010000   1.400000 (  1.357000)
ActionDispatch::DebugExceptions          2.580000   0.000000   2.580000 (  2.562000)
ActionDispatch::Session::CookieStore    10.440000   0.000000  10.440000 ( 10.423000)
ActionDispatch::Head                     1.600000   0.000000   1.600000 (  1.567000)
ActionDispatch::BestStandardsSupport     1.980000   0.000000   1.980000 (  1.961000)
Rack::ConditionalGet                     1.880000   0.000000   1.880000 (  1.833000)
Rack::ETag                              14.640000   0.020000  14.660000 ( 14.595000)
Rack::Runtime                           12.070000   0.020000  12.090000 ( 11.999000)
Log4rExceptionable::RackFailureHandler   3.930000   0.010000   3.940000 (  3.891000)
Honeybadger::UserInformer                2.070000   0.010000   2.080000 (  2.003000)
Honeybadger::UserFeedback                2.970000   0.000000   2.970000 (  2.957000)
Honeybadger::Rack                        3.360000   0.000000   3.360000 (  3.347000)