instead of P::FM, use Proc::Queue, it allows you to set a minimum time interval between forks: 

use Proc::Queue size => 2,
                delay => 3.0,
                qw(system_back);

foreach(@temp_files) {
    system_back("$program < $_");
}

1 while wait != -1;

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In reply to Re: How would I add a pause b/t forks in my $pid = $pm->start and next; by salva
in thread How would I add a pause b/t forks in my $pid = $pm->start and next; by axl163

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