As I understand it on Linux processes and threads are implemented in almost the same way, just that threads share memory. I've heard it said several times that the idea that processes are "heavier" is a bit of a myth. I guess they need to allocate heap space and threads don't. I'm not an expert, just mentioning because it sounded like you might be believing something which is at odds with what people say about processes and threads on Linux.
I'm not a Linux kernel dev but I think this is true! Not sure what's up with the downvotes.
You can create a process/thread chimera with certain system calls, and get something that is in-between a thread and process if you want, which is neat but maybe not that useful.
Creating processes on Linux is actually much faster than people seem to realize. I can spawn at least a few thousand a second from a quick test of spawning bash instances.
