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.
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.