diff --git a/ChangeLog b/ChangeLog
index f8cd53fcaf..9d52866098 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Fri Oct 19 10:20:10 2012  Koichi Sasada  <ko1@atdot.net>
+
+	* benchmark/driver.rb: add new option `--ruby-arg [ARG]'
+	  which is passed as a launch parameter for each ruby's execution.
+	  ($ ruby [ARG] [File])
+
 Thu Oct 18 18:42:35 2012  Koichi Sasada  <ko1@atdot.net>
 
 	* insns.def (opt_send_simple): move the location of
diff --git a/benchmark/driver.rb b/benchmark/driver.rb
index cea5d55b28..f93ccb3eb1 100644
--- a/benchmark/driver.rb
+++ b/benchmark/driver.rb
@@ -76,6 +76,7 @@ class BenchmarkDriver
     @verbose = opt[:quiet] ? false : (opt[:verbose] || false)
     @output = opt[:output] ? open(opt[:output], 'w') : nil
     @loop_wl1 = @loop_wl2 = nil
+    @ruby_arg = opt[:ruby_arg] || nil
     @opt = opt
 
     # [[name, [[r-1-1, r-1-2, ...], [r-2-1, r-2-2, ...]]], ...]
@@ -235,7 +236,9 @@ class BenchmarkDriver
   end
 
   def measure executable, file
-    cmd = "#{executable} #{file}"
+    cmd = "#{executable} #{@ruby_arg} #{file}"
+
+    output cmd
     m = Benchmark.measure{
       `#{cmd}`
     }
@@ -274,6 +277,9 @@ if __FILE__ == $0
     o.on('-o', '--output-file [FILE]', "Output file"){|f|
       opt[:output] = f
     }
+    o.on('--ruby-arg [ARG]', "Optional argument for ruby"){|a|
+      opt[:ruby_arg] = a
+    }
     o.on('-q', '--quiet', "Run without notify information except result table."){|q|
       opt[:quiet] = q
     }