いまさらですが、手軽で便利ですね、Cache::File。
手元にあるいろいろな Perl プログラムをキャッシュ化中。

Chris Leishman / Cache-2.04 - search.cpan.org
http://search.cpan.org/~cleishman/Cache-2.04/

#!/usr/bin/perl
use strict;
use warnings;

use Cache::File;
my $cache = Cache::File->new(cache_root => '/var/tmp/cache-test',
                             lock_level => Cache::File::LOCK_LOCAL(),
                             default_expires => '3 weeks');

my $key = "Yokuaru Namae";
my $data = $cache->get($key);
if ($data) {
    print "$key -> $data\n";
} else {
    $data = "Taro Yamada";
    $cache->set($key, $data, '10 minutes');
}

$key = "1374";
my Cache::Entry $entry = $cache->entry($key);
if ($entry->exists()) {
    $data = $entry->get();
} else {
    $data = "imi nashi san kyuu";
    $entry->set($data, '10 minutes');
}
print $entry->key(), " -> ", $entry->get(), "\n";
print "size = ", $entry->size(), "\n";
$entry->set_expiry('10 minutes');
#$entry->remove();

追記：
- [を] Cache::File で Storable[2006-10-24-6]
- [を] Cache::File の cache_umask[2006-11-27-5]