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package sort
import (
"algorithms/ds"
"fmt"
"testing"
)
// Store results here to avoid compiler optimizations
var benchResult ds.ArrayList
var benchResultInt []int
const minLength int = 1
const maxLength int = 10000
const maxSlowLength int = 10000
var arrayListCache map[string]ds.ArrayList
type sortAlgorithm func(ds.ArrayList) ds.ArrayList
type sortAlgorithmInt func([]int) []int
func TestSelectionSort(t *testing.T) {
for i := minLength; i <= maxSlowLength; i *= 10 {
test(Selection, i, t)
}
}
func TestInsertionSort(t *testing.T) {
for i := minLength; i <= maxSlowLength; i *= 10 {
test(Insertion, i, t)
}
}
func TestShellSort(t *testing.T) {
for i := minLength; i <= maxLength; i *= 10 {
test(Shell, i, t)
}
}
func TestMergeSort(t *testing.T) {
for i := minLength; i <= maxLength; i *= 10 {
test(Merge, i, t)
}
}
func TestBottomUpMergeSort(t *testing.T) {
t.Log("Parallel merge sort")
for i := minLength; i <= maxLength; i *= 10 {
test(BottomUpMerge, i, t)
}
test(BottomUpMerge, maxLength*2, t)
}
func TestParallelMergeSort(t *testing.T) {
t.Log("Bottom-up merge sort")
for i := minLength; i <= maxLength; i *= 10 {
test(ParallelMerge, i, t)
}
}
func TestQuickSort(t *testing.T) {
for i := minLength; i <= maxLength; i *= 10 {
test(Quick, i, t)
}
}
func TestParallelQuickSort(t *testing.T) {
for i := minLength; i <= maxLength; i *= 10 {
test(ParallelQuick, i, t)
}
}
func TestQuick3WaySort(t *testing.T) {
for i := minLength; i <= maxLength; i *= 10 {
test(Quick3Way, i, t)
}
}
func TestShuffleSort(t *testing.T) {
for i := 10; i <= maxLength; i *= 10 {
testShuffle(Shuffle, i, t)
}
}
func BenchmarkInsertionSort(b *testing.B) {
for i := minLength; i <= maxSlowLength; i *= 10 {
benchmark(Insertion, i, b)
}
}
func BenchmarkSelectionSort(b *testing.B) {
for i := minLength; i <= maxSlowLength; i *= 10 {
benchmark(Selection, i, b)
}
}
func BenchmarkShellSort(b *testing.B) {
for i := minLength; i <= maxLength; i *= 10 {
benchmark(Shell, i, b)
}
}
func BenchmarkMergeSort(b *testing.B) {
for i := minLength; i <= maxLength; i *= 10 {
benchmark(Merge, i, b)
}
}
func BenchmarkBottomUpMergeSort(b *testing.B) {
for i := minLength; i <= maxLength; i *= 10 {
benchmark(BottomUpMerge, i, b)
}
}
func BenchmarkParallelMergeSort(b *testing.B) {
for i := minLength; i <= maxLength; i *= 10 {
benchmark(ParallelMerge, i, b)
}
}
func BenchmarkQuickSort(b *testing.B) {
for i := minLength; i <= maxLength; i *= 10 {
benchmark(Quick, i, b)
}
}
func BenchmarkParallelQuickSort(b *testing.B) {
for i := minLength; i <= maxLength; i *= 10 {
benchmark(ParallelQuick, i, b)
}
}
func BenchmarkQuick3WaySort(b *testing.B) {
for i := minLength; i <= maxLength; i *= 10 {
benchmark(Quick3Way, i, b)
}
}
/*
func BenchmarkShuffleSort(b *testing.B) {
for i := minLength; i <= maxLength; i *= 10 {
benchmark(Shuffle, i, b)
}
}
*/
func test(sort sortAlgorithm, l int, t *testing.T) {
cb := func(t *testing.T) {
t.Parallel()
a := makeRandomIntegers(l, -1)
a = sort(a)
if !a.Sorted() {
t.Errorf("Array not sorted: %v", a)
}
}
t.Run(fmt.Sprintf("%d", l), cb)
}
func testShuffle(sort sortAlgorithm, l int, t *testing.T) {
cb := func(t *testing.T) {
t.Parallel()
a := sort(ds.NewAscendingArrayList(l))
if a.Sorted() {
t.Errorf("Array sorted: %v", a.FirstN(10))
}
}
t.Run(fmt.Sprintf("%d", l), cb)
}
func benchmark(sort sortAlgorithm, l int, b *testing.B) {
a := makeRandomIntegers(l, -1)
b.Run(fmt.Sprintf("random(%d)", l), func(b *testing.B) {
b.ResetTimer()
for i := 0; i < b.N; i++ {
benchResult = sort(a)
}
})
a = ds.NewAscendingArrayList(l)
b.Run(fmt.Sprintf("ascending(%d)", l), func(b *testing.B) {
b.ResetTimer()
for i := 0; i < b.N; i++ {
benchResult = sort(a)
}
})
a = ds.NewDescendingArrayList(l)
b.Run(fmt.Sprintf("descending(%d)", l), func(b *testing.B) {
b.ResetTimer()
for i := 0; i < b.N; i++ {
benchResult = sort(a)
}
})
}
func makeRandomIntegers(l, max int) ds.ArrayList {
// Use a cache to make sure that all all sorting algos use the same
// random sequences.
if arrayListCache == nil {
arrayListCache = make(map[string]ds.ArrayList)
}
key := fmt.Sprintf("random(%d, %d)", l, max)
if a, ok := arrayListCache[key]; ok {
return a
}
a := ds.NewRandomArrayList(l, max)
arrayListCache[key] = a
return a
}
|
