Rate FileFind  FixedOP
FileFind 163/s       --     -70%
FixedOP  546/s     235%       --

##</code><code>##

use File::Find;
use File::stat;
use strict;
use Benchmark qw(:all);

my $dirname = './';
my $oldestfile;
my $filename;

cmpthese (-2, {'FixedOP' => 'op ();', 'FileFind' => 'ff ()'});

sub op
{
$oldestfile = 0;
$filename = "No BOT REPORT: ERROR";

opendir(DIR, $dirname) or die "can't opendir $dirname: $!";
while (my $file = readdir(DIR))
  {
  if ($file =~ /\.txt$/)
    {
    my $x = stat($dirname.$file)->mtime ();
    if ( $x > $oldestfile) {
      $oldestfile = $x;
      $filename = $file;
    }
  }
}
#print "Oldest file >$filename< last touched $oldestfile\n";

closedir(DIR);
}


sub ff
{
$oldestfile = 0;
$filename = "No BOT REPORT: ERROR";

find (\&search, $dirname);
#print "Oldest file >$filename< last touched $oldestfile\n";

  sub search
  {
  if (-d $File::Find::name)
     {
     $File::Find::prune = 1 if $File::Find::name ne '.';
     return;
     }

  return if $File::Find::name !~ /\.txt$/;
  return if (my $x = stat($File::Find::name)->mtime ()) <= $oldestfile;
  $oldestfile = $x;
  $filename = $File::Find::name;
  }
}