Hi. Just a thought, but shouldnt you be reinitializing your variables before each test pass? Specifically

@hitwords
[download]

Otherwise if the test data size is at all signifigant youll end up holidng multiple copies of it in memory. This could lead to excessive swapping and the like.

Also I dont userstand your use of the sub run. cmpthese will execute count_it anyway so I dont see the purpose at all. A last point is that

while($word = <WORDS>){
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rings a bell somewhere. Its not that same thing iirc as saying

while (<WORDS>) {
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Although i could be wrong. I cant remember where this opinion comes from.

I would have expected your benchmark to look more like:

use Benchmark qw/cmpthese/;

cmpthese 1,{
read_proc => <<'EOFCODE',
    open(my $words,"words.txt") or die("Wordlist unavaliable.\n");
    my $hitcounter=0;
    my @hitwords;
    my $counter=0;
    my @words = <$words>;
    close($words);
    foreach my $word (@words){
        chomp $word;
        if ($word =~ m/[aeiouyAEIOUY]{4,}/){
          push(@hitwords,$word);
          $hitcounter++; 
        }
        $counter++;
    }
EOFCODE

for_proc => <<'EOFCODE',
    open(my $words,"words.txt") or die("Wordlist unavaliable.\n");
    my $hitcounter=0;
    my @hitwords;
    my $counter=0;
    foreach my $word (<$words>){
        chomp $word;
        if ($word =~ m/[aeiouyAEIOUY]{4,}/){
           push(@hitwords,$word);
           $hitcounter++; 
        }
        $counter++;
    }
    close($words);
EOFCODE
while_proc => <<'EOFCODE',
    open(my $words,"words.txt") or die("Wordlist unavaliable.\n");
    my $hitcounter=0;
    my @hitwords;
    my $counter=0;
    while(<$words>){
        chomp;
        if (m/[aeiouyAEIOUY]{4,}/){
           push(@hitwords,$_);
           $hitcounter++; 
        }
        $counter++;
    }
    close($words);
EOFCODE
};
[download]

--- demerphq
my friends call me, usually because I'm late....

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