* benchmark/driver.rb: some refactoring.

  (1) Remove `average differential'.
  In this benchmark driver, We should not care about `average'.
  We use fastest score because this score should not include
  any disturbances (affections of background process, etc).
  If you care about timing affect, I recommend `median'
  score with more than 5 examinations rather than simple
  `average' score (`average' score was affected by error scores).
  (2) Show log file name.
  (3) Change default directory from './' to driver's directory.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37224 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,16 @@
+Tue Oct 16 21:59:01 2012  Koichi Sasada  <[email protected]>
+
+	* benchmark/driver.rb: some refactoring.
+	  (1) Remove `average differential'.
+	      In this benchmark driver, We should not care about `average'.
+	      We use fastest score because this score should not include
+	      any disturbances (affections of background process, etc).
+	      If you care about timing affect, I recommend `median'
+	      score with more than 5 examinations rather than simple
+	      `average' score (`average' score was affected by error scores).
+	  (2) Show log file name.
+	  (3) Change default directory from './' to driver's directory.
+
 Tue Oct 16 14:56:23 2012  Nobuyoshi Nakada  <[email protected]>
 
 	* file.c (rb_file_join): need to check again after any conversion run.

benchmark/driver.rb

@@ -113,10 +113,7 @@ def show_results
       output "minimum results in each #{@repeat} measurements."
     end
 
-    difference = "\taverage difference" if @execs.length == 2
-    total_difference = 0
-
-    output "name\t#{@execs.map{|(_, v)| v}.join("\t")}#{difference}"
+    output "name\t#{@execs.map{|(_, v)| v}.join("\t")}"
     @results.each{|v, result|
       rets = []
       s = nil
@@ -137,18 +134,12 @@ def show_results
         rets << sprintf("%.3f", r)
       }
 
-      if difference
-        diff = average(result.last) - average(result.first)
-        total_difference += diff
-        rets << sprintf("%.3f", diff)
-      end
-
       output "#{v}#{s}\t#{rets.join("\t")}"
     }
 
-    if difference and @verbose
-      output '-----------------------------------------------------------'
-      output "average total difference is #{total_difference}"
+    if @opt[:output]
+      output
+      output "Log file: #{@opt[:output]}"
     end
   end
 
@@ -234,7 +225,7 @@ def measure executable, file
 if __FILE__ == $0
   opt = {
     :execs => ['ruby'],
-    :dir => './',
+    :dir => File.dirname(__FILE__),
     :repeat => 1,
     :output => "bmlog-#{Time.now.strftime('%Y%m%d-%H%M%S')}.#{$$}",
   }