What is the difference between goroutines and traditional execution threads?

Goroutines in Go are lightweight execution threads managed by the Go runtime, unlike traditional operating system threads.

Main differences:

• Lightweight: Goroutines occupy much less memory (usually a few kilobytes), whereas system threads require significantly more resources.

• Scalability: Thousands or even millions of goroutines can be launched simultaneously, which is difficult with traditional threads.

• Scheduling: The goroutine scheduler is built into the Go runtime and efficiently distributes goroutines across system threads.

• Synchronization: Channels are often used for communication between goroutines, simplifying data exchange and synchronization.

Example of creating a goroutine:

func sayHello() {
    fmt.Println("Hello from goroutine")
}

func main() {
    go sayHello() // launches a goroutine
    time.Sleep(time.Second) // waits for the goroutine to complete
}

Thus, goroutines are an efficient way to perform parallel code execution with lower overhead than traditional threads.