You are looking for the fork command. Fork creates two running processes, one the original and one the clone. A process may fork itself as often as it wants. This is how you do your 150 child processes.
in reply to spawning multiple child processes
Several people have built modules around fork, such as parallel::forkmanager or parallel::taskmanager can't remember names.
In your case, however, I think you just want to fork 150 times. Read the man page very closely, it takes a bit to wrap your mind around it.
I didn't believe in evil until I dated it.