1 files changed, 152 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/testing/performance/ruby.rb b/activesupport/lib/active_support/testing/performance/ruby.rb
new file mode 100644
index 0000000000..b29ec6719c
--- /dev/null
+++ b/activesupport/lib/active_support/testing/performance/ruby.rb
@@ -0,0 +1,152 @@
+begin
+  require 'ruby-prof'
+rescue LoadError
+  $stderr.puts 'Specify ruby-prof as application\'s dependency in Gemfile to run benchmarks.'
+  exit
+end
+
+module ActiveSupport
+  module Testing
+    module Performance
+      DEFAULTS.merge!(
+        if ARGV.include?('--benchmark')
+          { :metrics => [:wall_time, :memory, :objects, :gc_runs, :gc_time] }
+        else
+          { :min_percent => 0.01,
+            :metrics => [:process_time, :memory, :objects],
+            :formats => [:flat, :graph_html, :call_tree, :call_stack] }
+        end).freeze
+      
+      protected
+        def run_gc
+          GC.start
+        end
+
+      class Profiler < Performer
+        def initialize(*args)
+          super
+          @supported = @metric.measure_mode rescue false
+        end
+
+        def run
+          return unless @supported
+
+          RubyProf.measure_mode = @metric.measure_mode
+          RubyProf.start
+          RubyProf.pause
+          full_profile_options[:runs].to_i.times { run_test(@metric, :profile) }
+          @data = RubyProf.stop
+          @total = @data.threads.values.sum(0) { |method_infos| method_infos.max.total_time }
+        end
+
+        def record
+          return unless @supported
+
+          klasses = full_profile_options[:formats].map { |f| RubyProf.const_get("#{f.to_s.camelize}Printer") }.compact
+
+          klasses.each do |klass|
+            fname = output_filename(klass)
+            FileUtils.mkdir_p(File.dirname(fname))
+            File.open(fname, 'wb') do |file|
+              klass.new(@data).print(file, full_profile_options.slice(:min_percent))
+            end
+          end
+        end
+
+        protected
+          def output_filename(printer_class)
+            suffix =
+              case printer_class.name.demodulize
+                when 'FlatPrinter';                 'flat.txt'
+                when 'FlatPrinterWithLineNumbers';  'flat_line_numbers.txt'
+                when 'GraphPrinter';                'graph.txt'
+                when 'GraphHtmlPrinter';            'graph.html'
+                when 'GraphYamlPrinter';            'graph.yml'
+                when 'CallTreePrinter';             'tree.txt'
+                when 'CallStackPrinter';            'stack.html'
+                when 'DotPrinter';                  'graph.dot'
+                else printer_class.name.sub(/Printer$/, '').underscore
+              end
+
+            "#{super()}_#{suffix}"
+          end
+      end
+
+      module Metrics
+        class Base
+          def measure_mode
+            self.class::Mode
+          end
+          
+          def profile
+            RubyProf.resume
+            yield
+          ensure
+            RubyProf.pause
+          end
+
+          protected
+            # overridden by each implementation
+            def with_gc_stats
+              yield
+            end
+        end
+        
+        class ProcessTime < Time
+          Mode = RubyProf::PROCESS_TIME if RubyProf.const_defined?(:PROCESS_TIME)
+
+          def measure
+            RubyProf.measure_process_time
+          end
+        end
+
+        class WallTime < Time
+          Mode = RubyProf::WALL_TIME if RubyProf.const_defined?(:WALL_TIME)
+
+          def measure
+            RubyProf.measure_wall_time
+          end
+        end
+
+        class CpuTime < Time
+          Mode = RubyProf::CPU_TIME if RubyProf.const_defined?(:CPU_TIME)
+
+          def initialize(*args)
+            # FIXME: yeah my CPU is 2.33 GHz
+            RubyProf.cpu_frequency = 2.33e9 unless RubyProf.cpu_frequency > 0
+            super
+          end
+
+          def measure
+            RubyProf.measure_cpu_time
+          end
+        end
+
+        class Memory < DigitalInformationUnit
+          Mode = RubyProf::MEMORY if RubyProf.const_defined?(:MEMORY)
+        end
+
+        class Objects < Amount
+          Mode = RubyProf::ALLOCATIONS if RubyProf.const_defined?(:ALLOCATIONS)
+        end
+
+        class GcRuns < Amount
+          Mode = RubyProf::GC_RUNS if RubyProf.const_defined?(:GC_RUNS)
+        end
+
+        class GcTime < Time
+          Mode = RubyProf::GC_TIME if RubyProf.const_defined?(:GC_TIME)
+        end
+      end
+    end
+  end
+end
+
+if RUBY_VERSION.between?('1.9.2', '2.0')
+  require 'active_support/testing/performance/ruby/yarv'
+elsif RUBY_VERSION.between?('1.8.6', '1.9')
+  require 'active_support/testing/performance/ruby/mri'
+else
+  $stderr.puts 'Update your ruby interpreter to be able to run benchmarks.'
+  exit
+end