1000 Goroutines

main.go

package main

import (
	"fmt"
	"runtime"
	"sync"
	"time"
)

func main() {
	const n int = 1000
	const maxProcs int = 2

	runtime.GOMAXPROCS(maxProcs)

	var wg sync.WaitGroup
	wg.Add(n)
	for i := 0; i < n; i++ {
		go func(i int) {
			defer wg.Done()

			time.Sleep(time.Duration(i) * time.Millisecond)
			fmt.Printf("goroutine #%d, num goroutines: %d\n", i, runtime.NumGoroutine())
		}(i)
	}

	wg.Wait()
}