Is there a reason you used threads in the rust example instead of tasks? I think it would have been more useful to compare against proper rust async concurrency: I ran 200k sleep tasks over 12 threads using `async-std` and each thread only used up ~30% cpu (~60% on `tokio`), and <10% with 20k tasks.

What is the proper way to call `Process::sleep` in your example? I don't see it in the lunatic crate or documentation, and I can't compare results without running the same test in lunatic.

Edit: I guess async rust is mentioned, but it doesn't really explain in detail what lunatic is solving that async rust doesn't provide, besides a vague "more simple" and "extra features," which the example doesn't really show.