Mastering Go - Second Edition

The Go scheduler

The UNIX kernel scheduler is responsible for the execution of the threads of a program. On the other hand, the Go runtime has its own scheduler, which is responsible for the execution of the goroutines using a technique known as m:n scheduling, where m goroutines are executed using n operating system threads using multiplexing. The Go scheduler is the Go component responsible for the way and the order in which the goroutines of a Go program get executed. This makes the Go scheduler a really important part of the Go programming language, as everything in a Go program is executed as a goroutine.

Be aware that as the Go scheduler only deals with the goroutines of a single program, its operation is much simpler, cheaper, and ...