add benchmark for Rational

test/Benchmark/app/benchmark.rb

@@ -28,4 +28,7 @@ autorelease_pool { bm_string }
 puts "*** Time ***"
 autorelease_pool { bm_time }
 
+puts "*** Rational ***"
+autorelease_pool { bm_rational }
+
 exit(0)

test/Benchmark/app/benchmark/rational.rb

@@ -0,0 +1,9 @@
+def bm_rational
+  Benchmark.benchmark("", 30, "%r\n") do |x|
+    rational_new(x)
+    rational_plus(x)
+    rational_minus(x)
+    rational_divide(x)
+    rational_multiply(x)
+  end
+end

test/Benchmark/app/benchmark/rational/divide.rb

@@ -0,0 +1,21 @@
+def rational_divide(x)
+  rat1 = Rational(3, 2.5)
+  rat2 = Rational(3, 4)
+  x.report "/ Rational" do
+    500000.times do
+      rat1 / rat2
+    end
+  end
+
+  x.report "/ Fixnum" do
+    500000.times do
+      rat1 / 10
+    end
+  end
+
+  x.report "/ Float" do
+    500000.times do
+      rat1 / 4.5
+    end
+  end
+end

test/Benchmark/app/benchmark/rational/minus.rb

@@ -0,0 +1,21 @@
+def rational_minus(x)
+  rat1 = Rational(3, 2.5)
+  rat2 = Rational(3, 4)
+  x.report "- Rational" do
+    500000.times do
+      rat1 - rat2
+    end
+  end
+
+  x.report "- Fixnum" do
+    500000.times do
+      rat1 - 10
+    end
+  end
+
+  x.report "- Float" do
+    500000.times do
+      rat1 - 4.5
+    end
+  end
+end

test/Benchmark/app/benchmark/rational/multiply.rb

@@ -0,0 +1,21 @@
+def rational_multiply(x)
+  rat1 = Rational(3, 2.5)
+  rat2 = Rational(3, 4)
+  x.report "* Rational" do
+    500000.times do
+      rat1 * rat2
+    end
+  end
+
+  x.report "* Fixnum" do
+    500000.times do
+      rat1 * 10
+    end
+  end
+
+  x.report "* Float" do
+    500000.times do
+      rat1 * 4.5
+    end
+  end
+end

test/Benchmark/app/benchmark/rational/new.rb

@@ -0,0 +1,8 @@
+def rational_new(x)
+  x.report "Rational(x, y)" do
+    200000.times do
+      Rational(3, 2.5)
+    end
+  end
+
+end

test/Benchmark/app/benchmark/rational/plus.rb

@@ -0,0 +1,21 @@
+def rational_plus(x)
+  rat1 = Rational(3, 2.5)
+  rat2 = Rational(3, 4)
+  x.report "+ Rational" do
+    500000.times do
+      rat1 + rat2
+    end
+  end
+
+  x.report "+ Fixnum" do
+    500000.times do
+      rat1 + 10
+    end
+  end
+
+  x.report "+ Float" do
+    500000.times do
+      rat1 + 4.5
+    end
+  end
+end