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slice_split_test.go
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/
slice_split_test.go
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package main_test
import (
"testing"
)
func makeTestSlice(n int) []int {
s := make([]int, n)
for i := 0; i < n; i++ {
s[i] = i
}
return s
}
func sum(numbers []int, start int, end int, c chan int) {
sum := 0
for i := start; i < end; i++ {
sum += numbers[i]
}
c <- sum
}
func directSum(arr []int) int {
sum := 0
for _, v := range arr {
sum += v
}
return sum
}
// Sum the numbers in a slice using numberOfSplit go routines
func splitSum(c chan int, arr []int, numberOfSplit int) int {
splitSize := len(arr) / numberOfSplit
for i := 0; i < numberOfSplit; i++ {
start := i * splitSize
end := (i + 1) * splitSize
if i == numberOfSplit-1 {
end = len(arr)
}
go sum(arr, start, end, c)
}
sum := 0
for i := 0; i < numberOfSplit; i++ {
sum += <-c
}
return sum
}
const chanCapacity = 24
var c = make(chan int)
func TestSliceSplit(t *testing.T) {
arr := makeTestSlice(1007)
sum := splitSum(c, arr, 10)
t.Log("Sum from go routines: ", sum)
// check:
dSum := directSum(arr)
if dSum != sum {
t.Errorf("Mismatch in sums: %d %d", dSum, sum)
}
}
const howMany = 1000023
func BenchmarkDirectSum(b *testing.B) {
arr := makeTestSlice(howMany)
for i := 0; i < b.N; i++ {
directSum(arr)
}
}
func BenchmarkSplitSlice(b *testing.B) {
arr := makeTestSlice(howMany)
for i := 0; i < b.N; i++ {
splitSum(c, arr, chanCapacity)
}
}