Here's something I wrote recently to fork 6 processes at a time (on more than 6 jobs): 
#!/usr/bin/perl
use strict;
use warnings;
use Parallel::ForkManager;

my $pm = Parallel::ForkManager->new( 6 );
my %kids;

local $SIG{ INT } = sub {
    print "\nCaught interrupt, shutting down...";
    kill 9, keys %kids;
    $pm->wait_all_children;
    print "done.\n";
    exit;
};
# Remove child pid from running table
$pm->run_on_finish(
    sub {
        my $pid = shift;
        delete $kids{ $pid };
    }
);
for my $job ( @jobs ) {  # Whatever
    if ( my $pid = $pm->start ) {
        $kids{ $pid }++;
        print "Started $job...\n";
    }
    else {
        local $SIG{ INT } = sub { $pm->finish };        
        system( $job ); 
        $pm->finish;
    }
}
$pm->wait_all_children;

[download]

(edit) looks like I didn't reply to the parent, whoops.

In reply to Re^2: loop over to utilize all cpus by blakew
in thread loop over to utilize all cpus by Anonymous Monk

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