Well the thing is, Goroutines are not threads, they're coroutines. The go runtime uses up to a real thread per cpu core, and all your goroutines are run on thos

Well the thing is, Goroutines are not threads, they're coroutines. The go runtime uses up to a real thread per cpu core, and all your goroutines are run on those (fewer) real threads. The runtime also manages a shared thread pool for blocking syscalls e.g. local disk access and some kinds of name resolution depending on OS. But starting 10 goroutines is much cheaper than spawning 10 threads.