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#!/usr/bin/perl
#
# benchmark-cpu.pl: benchmark CPU optimizations of mpg123
#
# initially written by Nicholas J Humfrey <njh@aelius.com>, placed in the public domain
#
use strict;
#use Time::HiRes qw/time/;
my $MPG123_CMD = shift @ARGV;
my @TEST_FILES = @ARGV;
die "Please specify full path to mpg123 >= 1.7.0 and a test MP3 file to decode" if (scalar(@ARGV) < 1);
die "mpg123 command does not exist" unless (-e $MPG123_CMD);
die "mpg123 command is not executable" unless (-x $MPG123_CMD);
for(@TEST_FILES)
{
die "test MP3 file does not exist" unless (-e $_);
}
# Force unbuffed output on STDOUT
#$|=1; # why?
# Check the CPUs available
my $cpulist = `$MPG123_CMD --test-cpu`;
chomp( $cpulist );
die "Failed to get list of available CPU optimizations" unless ($cpulist =~ s/^Supported decoders: //);
my @cpus = split( / /, $cpulist );
my @encs = qw(s16 f32);
printf STDERR ("Found %d CPU optimizations to test...\n\n", scalar(@cpus) );
print "#mpg123 benchmark (user CPU time in seconds for decoding)\n";
print "#decoder";
for(@encs){ print " t_$_/s"; }
print "\n";
my $allret = 0;
foreach my $cpu (@cpus)
{
print "$cpu";
foreach my $e (@encs)
{
# using user CPU time
my @start_time = times();
my $ret = system($MPG123_CMD, '-q', '--cpu', $cpu, '-e', $e, '-t', @TEST_FILES );
my @end_time = times();
my $runtime = $end_time[2] - $start_time[2];
if($ret)
{
print STDERR "Execution of $MPG123_CMD failed with code $ret!\n";
$runtime = 0;
$allret = 1;
}
# third entry is child user time
printf(" %4.2f", $runtime);
}
print("\n");
}
exit($allret);
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