2 files changed, 83 insertions, 0 deletions
diff --git a/tasks/benchmark.rake b/tasks/benchmark.rake
new file mode 100644
index 000000000..f682f8ee1
--- /dev/null
+++ b/tasks/benchmark.rake
@@ -0,0 +1,82 @@
+module MRuby
+  BENCHMARK_REPEAT = 2
+end
+
+$dat_files = []
+
+def bm_files
+  Dir.glob("#{MRUBY_ROOT}/benchmark/*.rb")
+end
+
+def plot_file
+  File.join(MRUBY_ROOT, 'benchmark', 'bm.pdf')
+end
+
+def plot
+  opts_file = "#{MRUBY_ROOT}/benchmark/plot.gpl"
+  opts = File.read(opts_file).each_line.to_a.map(&:strip).join(';')
+  opts += ';plot '
+
+  dat_files = $dat_files.group_by {|f| File.dirname(f).split(File::SEPARATOR)[-1]}
+
+  opts += dat_files.keys.map do |data_file|
+    %Q['-' u 2:3:4:xtic(1) w hist title columnheader(1)]
+  end.join(',')
+  opts += ';'
+
+  cmd = %Q{gnuplot -p -e "#{opts}"}
+
+  IO.popen(cmd, 'w') do |p|
+    dat_files.each do |target_name, bm_files|
+      p.puts target_name
+      bm_files.each do |bm_file|
+        puts target_name
+        p.write File.read(bm_file)
+        print File.read(bm_file)
+      end
+      p.puts "e"
+    end
+  end
+end
+
+
+MRuby.each_target do |target|
+  mruby_path = "#{target.build_dir}/bin/mruby"
+  if File.file? mruby_path
+    bm_files.each do |bm_file|
+      bm_name = File.basename bm_file, ".rb"
+
+      dat_dir = File.join('benchmark', target.name)
+      dat_file = File.join(dat_dir, "#{bm_name}.dat")
+      $dat_files << dat_file
+
+      directory dat_dir
+
+      file dat_file => [bm_file, dat_dir] do |task|
+        print bm_name
+        puts "..."
+
+        data = (0...MRuby::BENCHMARK_REPEAT).map do |n|
+          str = %x{(time -f "%e %S %U" #{mruby_path} #{bm_file}) 2>&1 >/dev/null}
+          str.split(' ').map(&:to_f)
+        end
+
+        File.open(task.name, "w") do |f|
+          data = data.map {|_,r,s| (r + s) / 2.0}
+          min = data.min
+          max = data.max
+          avg = data.inject(&:+) / data.size
+          f.puts "#{bm_name.gsub('_', '-')} #{avg} #{min} #{max}"
+        end
+      end
+    end
+  end
+end
+
+file plot_file => $dat_files do
+  plot
+end
+
+task :benchmark => plot_file do
+  plot
+end
diff --git a/tasks/mruby_build.rake b/tasks/mruby_build.rake
index 8438b6ca4..66608286d 100644
--- a/tasks/mruby_build.rake
+++ b/tasks/mruby_build.rake
@@ -8,6 +8,7 @@ module MRuby
     end
 
     def each_target(&block)
+      return to_enum(:each_target) if block.nil?
       @targets.each do |key, target|
         target.instance_eval(&block)
       end