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In Go, the scheduler is implemented as part of the runtime and is responsible for managing goroutines, which are lightweight threads. Key principles:

• There are multiple system threads (M) on which goroutines (G) run.
• The scheduler links goroutines to threads via P (processor) objects, which manage queues of ready-to-run goroutines.
• Goroutines are placed in a queue, and the scheduler selects the next one to execute.
• If a goroutine blocks (e.g., on I/O), the scheduler switches to another.

Example of creating and starting a goroutine:

package main

import (
    "fmt"
    "time"
)

func task(id int) {
    fmt.Printf("Task %d started\n", id)
    time.Sleep(time.Second)
    fmt.Printf("Task %d finished\n", id)
}

func main() {
    for i := 1; i <= 3; i++ {
        go task(i) // start a goroutine
    }
    time.Sleep(2 * time.Second) // wait for completion
}

This way, the Go scheduler efficiently distributes the execution of multiple goroutines across a limited number of system threads, ensuring concurrency and parallelism.