GO Concurrency Performance

concurrency.go

package main

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

func process(data int) int {
	time.Sleep(time.Second * 2)

	return data * 2
}

func processData(wg *sync.WaitGroup, resultDest *int, data int) {

	defer wg.Done()

	processData := process(data)

	*resultDest = processData
}

func main() {
	start := time.Now()

	var wg sync.WaitGroup
	input := []int{1, 2, 3, 4, 5}
	result := make([]int, len(input))

	for i, v := range input {
		wg.Add(1)

		go processData(&wg, &result[i], v)
	}

	wg.Wait()

	fmt.Println(time.Since(start))
	fmt.Println(result)
}