diff --git a/ChangeLog b/ChangeLog
index ff703adcd2..46e89329b6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Nov  3 02:35:32 2014  Koichi Sasada  <ko1@atdot.net>
+
+	* sample/simple-bench.rb: added to measure performance of simple
+	  lines.
+
 Mon Nov  3 02:33:43 2014  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c (obj_info): show T_STRING more details.
diff --git a/sample/simple-bench.rb b/sample/simple-bench.rb
new file mode 100644
index 0000000000..f3a5380b1d
--- /dev/null
+++ b/sample/simple-bench.rb
@@ -0,0 +1,140 @@
+require 'benchmark'
+
+def foo0
+end
+def foo3 a, b, c
+end
+def foo6 a, b, c, d, e, f
+end
+
+def iter0
+  yield
+end
+
+def iter1
+  yield 1
+end
+
+def iter3
+  yield 1, 2, 3
+end
+
+def iter6
+  yield 1, 2, 3, 4, 5, 6
+end
+
+(1..6).each{|i|
+  kws = (1..i).map{|e| "k#{e}: #{e}"}
+  eval %Q{
+    def foo_kw#{i}(#{kws.join(', ')})
+    end
+  }
+
+  kws = (1..i).map{|e| "k#{e}:"}
+  eval %Q{
+    def foo_required_kw#{i}(#{kws.join(', ')})
+    end
+  }
+}
+
+(1..6).each{|i|
+  kws = (1..i).map{|e| "k#{e}: #{e} + 1"}
+  eval %Q{
+    def foo_complex_kw#{i}(#{kws.join(', ')})
+    end
+  }
+}
+
+(1..6).each{|i|
+  kws = (1..i).map{|e| "k#{e}: #{e}"}
+  eval %Q{
+    def iter_kw#{i}
+      yield #{kws.join(', ')}
+    end
+  }
+}
+
+ary1 = [1]
+ary2 = [[1, 2, 3, 4, 5]]
+
+test_methods = %Q{
+  # empty 1
+  # empty 2
+  foo0
+  foo3 1, 2, 3
+  foo6 1, 2, 3, 4, 5, 6
+  foo_kw1
+  foo_kw2
+  foo_kw3
+  foo_kw4
+  foo_kw5
+  foo_kw6
+  foo_kw6 k1: 1
+  foo_kw6 k1: 1, k2: 2
+  foo_kw6 k1: 1, k2: 2, k3: 3
+  foo_kw6 k1: 1, k2: 2, k3: 3, k4: 4
+  foo_kw6 k1: 1, k2: 2, k3: 3, k4: 4, k5: 5
+  foo_kw6 k1: 1, k2: 2, k3: 3, k4: 4, k5: 5, k6: 6
+  foo_required_kw1 k1: 1
+  foo_required_kw2 k1: 1, k2: 2
+  foo_required_kw3 k1: 1, k2: 2, k3: 3
+  foo_required_kw4 k1: 1, k2: 2, k3: 3, k4: 4
+  foo_required_kw5 k1: 1, k2: 2, k3: 3, k4: 4, k5: 5
+  foo_required_kw6 k1: 1, k2: 2, k3: 3, k4: 4, k5: 5, k6: 6
+  foo_complex_kw1
+  foo_complex_kw2
+  foo_complex_kw3
+  foo_complex_kw4
+  foo_complex_kw5
+  foo_complex_kw6
+  foo_complex_kw6 k1: 1
+  foo_complex_kw6 k1: 1, k2: 2
+  foo_complex_kw6 k1: 1, k2: 2, k3: 3
+  foo_complex_kw6 k1: 1, k2: 2, k3: 3, k4: 4
+  foo_complex_kw6 k1: 1, k2: 2, k3: 3, k4: 4, k5: 5
+  foo_complex_kw6 k1: 1, k2: 2, k3: 3, k4: 4, k5: 5, k6: 6
+  iter0{}
+  iter1{}
+  iter1{|a|}
+  iter3{}
+  iter3{|a|}
+  iter3{|a, b, c|}
+  iter6{}
+  iter6{|a|}
+  iter6{|a, b, c, d, e, f, g|}
+  iter0{|k1: nil, k2: nil, k3: nil, k4: nil, k5: nil, k6: nil|}
+  iter_kw1{|k1: nil, k2: nil, k3: nil, k4: nil, k5: nil, k6: nil|}
+  iter_kw2{|k1: nil, k2: nil, k3: nil, k4: nil, k5: nil, k6: nil|}
+  iter_kw3{|k1: nil, k2: nil, k3: nil, k4: nil, k5: nil, k6: nil|}
+  iter_kw4{|k1: nil, k2: nil, k3: nil, k4: nil, k5: nil, k6: nil|}
+  iter_kw5{|k1: nil, k2: nil, k3: nil, k4: nil, k5: nil, k6: nil|}
+  iter_kw6{|k1: nil, k2: nil, k3: nil, k4: nil, k5: nil, k6: nil|}
+  ary1.each{|e|}
+  ary1.each{|e,|}
+  ary1.each{|a, b, c, d, e|}
+  ary2.each{|e|}
+  ary2.each{|e,|}
+  ary2.each{|a, b, c, d, e|}
+}
+
+N = 10_000_000
+
+max_line = test_methods.each_line.max_by{|line| line.strip.size}
+max_size = max_line.strip.size
+
+Benchmark.bm(max_size){|x|
+
+  str = test_methods.each_line.map{|line| line.strip!
+    next if line.empty?
+    %Q{
+      x.report(#{line.dump}){
+        i = 0
+        while i<#{N}
+          #{line}
+          i+=1
+        end
+      }
+    }
+  }.join("\n")
+  eval str
+}