Jersey would most likely be re-using threads in a ...

# ktor

[mp]

Jersey would most likely be re-using threads in a thread pool. Ktor uses a certain number of threads for the underlying i/o engine (e.g. netty) -- I'm not sure what the default thread pool sizing policy is for that. Your code will run on those, and the threads will move on to service other coroutines when a given coroutine suspends.