use strict;
use warnings;

use Parallel::ForkManager;
use MCE::Shared;

my $pm = Parallel::ForkManager->new(3);

my @group = (
   [ 'f1','f2','f3' ],
   [ 'f4','f5','f6' ],
   [ 'f7','f8','f9' ]
);

my $quality = MCE::Shared->array;

foreach my $i (@group) {
   $pm->start and next;
   foreach my $term (@$i) {
      warn "No such file. - $term\n" and next if ! -e $term;
      ...
      my $IsGood = ...;
      $quality->push($IsGood);
   }
   $pm->finish;
}

$pm->wait_all_children;

print join("\n", $quality->vals), "\n";