create_goroutine_test.go

package main
        
import (
	"testing"
	"strconv"
	"sync"
)
        
func BenchmarkCreateGoroutine(b *testing.B) {
	nums := []int {
		1, 4, 16, 64, 256, 1024, 4096, 16384, 65536,
	}
	for _, num := range nums {
		name := strconv.Itoa(num)
		b.Run(name, func(b *testing.B) { 
			b.ResetTimer()
			for i := 0; i < b.N/num; i++ {
				var wg sync.WaitGroup
				wg.Add(num)
				for j := 0; j < num; j++ {
					go func() {
						wg.Done()
					}()
				}
				wg.Wait()
			}
		})
	}
}