testing/sisyphus/bin/mips.pl

   1 #!/usr/bin/perl -w
   2 # -*- Mode: Perl; tab-width: 4; indent-tabs-mode: nil; -*-
   3 # ***** BEGIN LICENSE BLOCK *****
   4 # Version: MPL 1.1/GPL 2.0/LGPL 2.1
   5 #
   6 # The contents of this file are subject to the Mozilla Public License Version
   7 # 1.1 (the "License"); you may not use this file except in compliance with
   8 # the License. You may obtain a copy of the License at
   9 # http://www.mozilla.org/MPL/
  10 #
  11 # Software distributed under the License is distributed on an "AS IS" basis,
  12 # WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  13 # for the specific language governing rights and limitations under the
  14 # License.
  15 #
  16 # The Original Code is Mozilla Automated Testing Code.
  17 #
  18 # The Initial Developer of the Original Code is
  19 # Mozilla Corporation.
  20 # Portions created by the Initial Developer are Copyright (C) 2008
  21 # the Initial Developer. All Rights Reserved.
  22 #
  23 # Contributor(s): Bob Clary <bob@bclary.com>
  24 #
  25 # Alternatively, the contents of this file may be used under the terms of
  26 # either the GNU General Public License Version 2 or later (the "GPL"), or
  27 # the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28 # in which case the provisions of the GPL or the LGPL are applicable instead
  29 # of those above. If you wish to allow use of your version of this file only
  30 # under the terms of either the GPL or the LGPL, and not to allow others to
  31 # use your version of this file under the terms of the MPL, indicate your
  32 # decision by deleting the provisions above and replace them with the notice
  33 # and other provisions required by the GPL or the LGPL. If you do not delete
  34 # the provisions above, a recipient may use your version of this file under
  35 # the terms of any one of the MPL, the GPL or the LGPL.
  36 #
  37 # ***** END LICENSE BLOCK *****
  38
  39 # Calculate a relative speed measurement based on
  40 # iterating over a simple loop in perl. Print the
  41 # result as millions of iterations per cpu second.
  42
  43 sub mips
  44 {
  45     my $tries = 3;        # repeat count to get average
  46     my $m     = 1000000;  # scale to million iterations/second
  47     my $l     = 10000000; # number of iterations to time
  48     my $cpu   = 0;        # cpu time accumlator
  49     my $dummy = 0;        # dummy variable to prevent optimizations
  50     my $i;
  51     my $start;
  52     my $stop;
  53     my $a;
  54
  55     for ($a = 0; $a < $tries; ++$a)
  56     {
  57         $start = (times)[0];
  58         for ($i = 0; $i < $l; ++$i)
  59         {
  60             $dummy += $i;
  61         }
  62         $stop = (times)[0];
  63         $cpu += $stop - $start;
  64     }
  65     $cpu /= $tries;
  66
  67     print "" . int($l/($cpu*$m)) . "\n";
  68
  69     return $dummy; # reuse dummy variable
  70 }
  71
  72 mips;