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#!/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);
}
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