diff -r 000000000000 -r 4f2f89ce4247 WebKitTools/Scripts/compare-timing-files
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKitTools/Scripts/compare-timing-files	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,88 @@
+#!/usr/bin/perl
+
+# Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1.  Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+# 2.  Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in the
+#     documentation and/or other materials provided with the distribution.
+# 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+#     its contributors may be used to endorse or promote products derived
+#     from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# This script takes two files that are lists of timings and compares them.
+
+use warnings;
+use strict;
+use Getopt::Long;
+
+my $usage = "compare-timing-files [-c|--count results] oldFile newFile";
+
+my $count = 1;
+GetOptions("c|count=i" => \$count);
+
+my ($file1, $file2) = @ARGV;
+die "$usage\n" unless ($file1 && $file2 && @ARGV == 2);
+
+my ($oldAverage, $oldRange, $oldRangePercent) = parseResults($file1);
+my ($newAverage, $newRange, $newRangePercent) = parseResults($file2);
+
+print "\n===== $file1 =====\n";
+if ($count == 1) {
+    print("fastest run: $oldAverage\n");
+} else {
+    print("average of fastest $count runs: $oldAverage\n");
+    printf("range of fastest $count runs: %.2f%% (%d)\n", $oldRangePercent, $oldRange);
+}
+
+print "\n===== $file2 =====\n";
+if ($count == 1) {
+    print("fastest run: $newAverage\n");
+} else {
+    print("average of fastest $count runs: $newAverage\n");
+    printf("range of fastest $count runs: %.2f%% (%d)\n", $newRangePercent, $newRange);
+}
+
+my $gainOrLoss = $newAverage <= $oldAverage ? "GAIN" : "LOSS";
+my $difference = abs($newAverage - $oldAverage);
+my $differencePercent = $difference / $oldAverage * 100;
+printf("\nperformance %s of %.2f%% (%.1f / %.1f)\n", $gainOrLoss, $differencePercent, $difference, $oldAverage);
+print "\n";
+
+sub parseResults
+{
+    my ($file) = @_;
+    
+    open(FILE, $file) or die "Couldn't open file: $file";
+    my @results = <FILE>;
+    close(FILE);
+
+    @results = sort(@results);
+    my $total = 0;
+    for (my $i = 0; $i < $count; $i++) {
+        $results[$i] =~ s/\D*//; # cut out non-digits
+        $total += $results[$i]; 
+    }
+    my $average = $total / $count;
+    my $range = $results[$count - 1] - $results[0];
+    my $rangePercent = $range / $results[$count - 1] * 100;
+
+    return ($average, $range, $rangePercent);
+}
+