Let's say you're implementing a map function to run in parallel, how do you decide how many threads to spawn. There seems to be a pretty heavy cost to spawning a thread per cell when the list is very long, instead of having each thread process a few cells each. What's this topic called? What do I need to search for best practices?

@neauoire I would think spawning one thread per CPU and then having them sleep until work is ready to be sent to them would be the regular way to do things