I'm trying to fork for each batch of a fetchall_arrayref():

my $indexers = Parallel::ForkManager->new(14);
while (my $data = $r->fetchall_arrayref(undef, 5000)){
         $indexers->start and next;
         ..  do stuff ..
         $indexers->finish;
}
$indexers->wait_all_children;
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But that just processes the chunks 14 times. If I reverse the order, I chunk and process the data again 14 times. What's the best way to combine these and actually fire off forks for batches of DBI results? Thanks all for helping a new junior monk here...