Conversion of Cumul.java to Go

cumul.go

// Code from http://lemire.me/blog/archives/2012/07/23/is-cc-worth-it/
// Converted to Go by Nick Craig-Wood
// Runs in pretty much identical time to the "basic sum (C++-like)" code

package main

import (
	"fmt"
	"time"
)

func sum(data []int) {
	for i := range data[1:] {
		data[i+1] += data[i]
	}
}

func givemeanarray(N int) []int {
	bigarray := make([]int, N)
	for k := range bigarray {
		bigarray[k] = k + k/3
	}
	return bigarray
}

func test(N int) {
	for t := 0; t < 10; t++ {
		data := givemeanarray(N)
		bef := time.Now()
		sum(data)
		duration := time.Since(bef).Seconds()
		fmt.Println(float64(N) / duration / 1E6)
	}
}

func main() {
	test(50 * 1000 * 1000)
}