Parallel example

main.go

package main

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

func main() {
	//runtime.GOMAXPROCS(runtime.NumCPU())
	//runtime.GOMAXPROCS(1)
	startTime := time.Now().Unix()

	names := []string{"Phil", "Noodles", "Barbaro"}

	var wg sync.WaitGroup
	wg.Add(len(names))

	for _, name := range names {
		go printName(name, &wg)
	}

	wg.Wait()

	endTime := time.Now().Unix()
	duration := endTime - startTime
	fmt.Println("\nDone in", duration, "seconds")
}

func printName(n string, wg *sync.WaitGroup) {
	result := 0.0
	for i := 0; i < 100000000; i++ {
		result += 3 / math.Pi * math.Sin(2)
	}
	fmt.Println("Name: ", n)
	wg.Done()
}