Most likely you're going to simply be throttled by IO speed. However, your above code could in theory be simplified by limiting the split to only 3 parts, and by adding the dup check to the while loop. Assuming that dup count is all you really care about.
if ($file =~ $spec_text){
my $file_date = (split(/\./,$file))[3];
open(IN, '<', $file) or die("open failed: $!");
my $count_uniq = 0;
my %seen;
while (<IN>) {
chomp;
my ($ele0, $ele1, undef) = split ';', $_, 3;
$count_uniq++ if !$seen{"$ele0;$ele1;$file_date"}++;
}
print "$.\n"; # Total number of lines.
print "$count_uniq\n";
close(IN);
}
- Miller