Add task for running and plotting benchmarks

.gitignore

@@ -2,6 +2,8 @@
 *.bak
 *.d
 *.o
+benchmark/**/*.dat
+benchmark/*.pdf
 *.orig
 *.pdb
 *.rej

Rakefile

@@ -29,6 +29,8 @@ load "#{MRUBY_ROOT}/tasks/libmruby.rake"
 load "#{MRUBY_ROOT}/tasks/mrbgems_test.rake"
 load "#{MRUBY_ROOT}/test/mrbtest.rake"
 
+load "#{MRUBY_ROOT}/tasks/benchmark.rake"
+
 ##############################
 # generic build targets, rules
 task :default => :all

benchmark/ao-render.rb

@@ -5,8 +5,8 @@
 # mruby version by Hideki Miura
 #
 
-IMAGE_WIDTH = 256
-IMAGE_HEIGHT = 256
+IMAGE_WIDTH = 64
+IMAGE_HEIGHT = 64
 NSUBSAMPLES = 2
 NAO_SAMPLES = 8
 

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

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