for my $host (@hosts) {
    if (!$pm->start("cmd1 on $host")) {
        exec(@cmd1, $host);
        print(STDERR "cmd1 exec failed: $!\n");
        _exit($!); 
    }
    if (!$pm->start("cmd2 on $host")) {
        exec(@cmd2, $host);
        print(STDERR "cmd2 exec failed: $!\n");
        _exit($!); 
    }
}