Selgitage, miks ei saa otse seostada lõimede arvu goroutine'ide arvuga Go keeles.

In Go, the number of goroutines does not match the number of operating system threads because goroutines are lightweight threads managed by the Go runtime, not by the OS.

Main reasons:

• Multiplexing: The Go runtime distributes many goroutines over a limited number of system threads and switches between them efficiently.
• Lightweight: Creating a goroutine requires much fewer resources than creating a system thread.
• Go scheduler: Manages the execution of goroutines, allowing thousands of them to run on multiple threads.

Therefore, the number of goroutines cannot be directly mapped to the number of threads — usually, many goroutines run on a single thread, which allows efficient resource utilization and simplifies concurrent programming.

Example:

runtime.GOMAXPROCS(4) // Sets the number of OS threads

for i := 0; i < 1000; i++ {
    go func(id int) {
        fmt.Println("Goroutine", id)
    }(i)
}

Here, 1000 goroutines will operate on 4 OS threads.