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Modifications to make sorts more benchmarkable

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This commit is contained in:
hitanshu310 2025-02-10 23:19:24 +05:30
parent 6a752c9dc2
commit d84cc16d24
16 changed files with 352 additions and 77 deletions
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57
clients/src/main/java/com/hithomelabs/clients/Benchmarks/BenchMark.java Normal file
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@ -0,0 +1,57 @@
package com.hithomelabs.clients.Benchmarks;
import com.hithomelabs.princeton1.common.Apple;
import com.hithomelabs.princeton1.module5.MeasurableSort;
import com.hithomelabs.princeton1.module5.SortingMetaData;
import java.util.List;
import java.util.Random;
public class BenchMark {
private int size;
private List<MeasurableSort<Apple>> algorithms;
private Apple[] sorted;
private Apple[] reverseSorted;
private Apple[] random;
BenchMark(int size, List<MeasurableSort<Apple>> algorithms) {
this.size = size;
this.algorithms = algorithms;
sorted = new Apple[this.size];
reverseSorted = new Apple[this.size];
random = new Apple[this.size];
for (int i = 0; i < size; i++) {
sorted[i] = new Apple(i);
reverseSorted[i] = new Apple(size - i);
random[i] = new Apple(new Random().nextInt(1000));
}
}
public void run() {
for (MeasurableSort<Apple> algo: algorithms){
System.out.println("Input size: "+size);
System.out.println("Running "+algo.getClass());
System.out.println("Sorting already sorted list");
SortingMetaData metaData = new SortingMetaData();
algo.sort(sorted.clone(),Apple.COMPARE_BY_SIZE, metaData);
System.out.println(metaData);
System.out.println("Sorting reverse sorted list");
metaData = new SortingMetaData();
algo.sort(reverseSorted.clone(),Apple.COMPARE_BY_SIZE, metaData);
System.out.println(metaData);
System.out.println("Sorting randomly ordered list");
metaData = new SortingMetaData();
algo.sort(random.clone(),Apple.COMPARE_BY_SIZE, metaData);
System.out.println(metaData);
}
}
}

37
clients/src/main/java/com/hithomelabs/clients/Benchmarks/BenchMarkingClient.java Normal file
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@ -0,0 +1,37 @@
package com.hithomelabs.clients.Benchmarks;
import com.hithomelabs.princeton1.common.Apple;
import com.hithomelabs.princeton1.module5.Insertion;
import com.hithomelabs.princeton1.module5.MeasurableSort;
import com.hithomelabs.princeton1.module5.Selection;
import com.hithomelabs.princeton1.module5.Shell;
import com.hithomelabs.princeton1.module6.Merge;
import com.hithomelabs.princeton1.module7.Quick;
import java.util.ArrayList;
import java.util.List;
public class BenchMarkingClient {
public static void main(String[] args) {
List<MeasurableSort<Apple>> algorithms = new ArrayList<MeasurableSort<Apple>>();
algorithms.add(new Selection<Apple>());
algorithms.add(new Insertion<Apple>());
algorithms.add(new Shell<Apple>());
algorithms.add(new Merge<Apple>());
algorithms.add(new Quick<Apple>());
BenchMark b1 = new BenchMark(32, algorithms);
BenchMark b2 = new BenchMark(512, algorithms);
BenchMark b3 = new BenchMark(1024, algorithms);
BenchMark b4 = new BenchMark(4096,algorithms);
b1.run();
b2.run();
b3.run();
b4.run();
}
}

9
common/src/main/java/com/hithomelabs/princeton1/common/Apple.java
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@ -1,9 +1,18 @@
package com.hithomelabs.princeton1.common;
import java.util.Comparator;
import java.util.Objects;
public class Apple implements Comparable<Apple> {
private int size;
public static Comparator<Apple> COMPARE_BY_SIZE = new Comparator<Apple>() {
@Override
public int compare(Apple a1, Apple a2) {
if(a1.size < a2.size) return -1;
else if (a1.size == (a2.size)) return 0;
else return 1;
}
};
public Apple(int size) {
this.size = size;

17
module5/src/main/java/com/hithomelabs/princeton1/module5/AbstractCustomSorts.java
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@ -1,17 +0,0 @@
package com.hithomelabs.princeton1.module5;
public abstract class AbstractCustomSorts<E> {
public abstract void sort(E[] arr);
public void exch(E[] arr, int j, int i) {
E temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
public boolean less(Comparable<E> e1, E e2) {
return e1.compareTo(e2) < 0;
}
}

17
module5/src/main/java/com/hithomelabs/princeton1/module5/ComparableSort.java Normal file
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@ -0,0 +1,17 @@
package com.hithomelabs.princeton1.module5;
public interface ComparableSort<E> {
void sort(E[] arr);
default void exch(E[] arr, int j, int i) {
E temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
default boolean less(Comparable<E> e1, E e2) {
return e1.compareTo(e2) < 0;
}
}

15
module5/src/main/java/com/hithomelabs/princeton1/module5/ComparatorComparableSort.java Normal file
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@ -0,0 +1,15 @@
package com.hithomelabs.princeton1.module5;
import java.util.Comparator;
public interface ComparatorComparableSort<E> extends ComparableSort<E> {
public void sort(E[] arr, Comparator<E> cmp);
public default boolean less(E v, E w, Comparator<E> cmp){
if (cmp == null)
return ComparableSort.super.less((Comparable<E>) v, w);
else
return cmp.compare(v, w) < 0;
}
}

34
module5/src/main/java/com/hithomelabs/princeton1/module5/Insertion.java
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@ -1,23 +1,41 @@
package com.hithomelabs.princeton1.module5;
public class Insertion<E> extends AbstractCustomSorts<E> {
import java.util.Comparator;
public void sort(E[] arr){
public class Insertion<E> implements MeasurableSort<E> {
public void sort(E[] arr) {
coreSortLogic(arr, null, null);
}
private void coreSortLogic(E[] arr, Comparator<E> cmp, SortingMetaData metaData) {
if (arr == null) return;
else{
else {
int N = arr.length;
// * * swap arr[i] with each element greater to it's left
for (int i = 1; i < N; i++){
for (int i = 1; i < N; i++) {
int j = i;
while(j >= 1 && less((Comparable<E>)arr[j], arr[j-1])){
exch(arr, j, j-1);
j = j-1;
while (j >= 1 && less(arr[j], arr[j - 1], cmp, metaData)) {
exch(arr, j, j - 1, metaData);
j = j - 1;
}
}
}
}
@Override
public void sort(E[] arr, Comparator<E> cmp, SortingMetaData metaData) {
if (metaData != null)
metaData.startTime();
coreSortLogic(arr, cmp, metaData);
if (metaData != null)
metaData.endTime();
}
@Override
public void sort(E[] arr, Comparator<E> cmp) {
coreSortLogic(arr, cmp, null);
}
}

22
module5/src/main/java/com/hithomelabs/princeton1/module5/MeasurableSort.java Normal file
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@ -0,0 +1,22 @@
package com.hithomelabs.princeton1.module5;
import java.util.Comparator;
public interface MeasurableSort<E> extends ComparatorComparableSort<E> {
default boolean less(E v, E w, Comparator<E> cmp, SortingMetaData metaData) {
if (metaData != null)
metaData.incrementCompares();
return ComparatorComparableSort.super.less(v, w, cmp);
}
default void exch(E[] arr, int j, int i, SortingMetaData metaData) {
if (metaData != null)
metaData.incrementExchanges();
ComparatorComparableSort.super.exch(arr, j, i);
}
public void sort(E[] arr, Comparator<E> cmp, SortingMetaData metaData);
}

25
module5/src/main/java/com/hithomelabs/princeton1/module5/Selection.java
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@ -1,23 +1,42 @@
package com.hithomelabs.princeton1.module5;
public class Selection<E> extends AbstractCustomSorts<E>{
import java.util.Comparator;
public class Selection<E> implements MeasurableSort<E> {
/*
* * Selection sort "selects" the smallest element and swaps it with arr[0] of the array
* * Then proceeds to do the same swapping arr[i] with arr[i:arr.length-1]
*/
public void sort(E[] arr){
coreSortLogic(arr, null, null);
}
private void coreSortLogic(E[] arr, Comparator<E> cmp, SortingMetaData metaData){
if (arr == null) return;
Comparable<E>[] arr1 = (Comparable<E>[]) arr;
for(int i = 0; i < arr1.length - 1; i++){
int minIndex = i;
for(int j = i+1; j < arr.length; j ++){
if (less((Comparable<E>) arr[j], arr[minIndex])) minIndex = j;
if (less(arr[j], arr[minIndex], cmp, metaData)) minIndex = j;
}
exch(arr, i, minIndex);
exch(arr, i, minIndex, metaData);
}
}
@Override
public void sort(E[] arr, Comparator<E> cmp, SortingMetaData metaData) {
if (metaData != null)
metaData.startTime();
coreSortLogic(arr, cmp, metaData);
if (metaData != null)
metaData.endTime();
}
@Override
public void sort(E[] arr, Comparator<E> cmp) {
coreSortLogic(arr, cmp, null);
}
}

44
module5/src/main/java/com/hithomelabs/princeton1/module5/Shell.java
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@ -1,13 +1,9 @@
package com.hithomelabs.princeton1.module5;
public class Shell<E> extends AbstractCustomSorts<E> {
import java.util.ArrayList;
import java.util.Comparator;
// * * sample metadata class to compare no. of sorts and compares, shell sort vs insertion sort
private class MetaData{
int compares;
int swaps;
}
public class Shell<E> implements MeasurableSort<E> {
/*
* * We will be performing h sort
@ -24,7 +20,10 @@ public class Shell<E> extends AbstractCustomSorts<E> {
*/
@Override
public void sort(E[] arr) {
MetaData metaData = new MetaData();
coreSortLogic(arr,null,null);
}
private void coreSortLogic(E[] arr, Comparator<E> cmp, SortingMetaData metaData){
int N = arr.length;
int h = 1;
// * * Calculates the largest value of h greater than n
@ -32,22 +31,18 @@ public class Shell<E> extends AbstractCustomSorts<E> {
h = 3 * h + 1;
}
while (h >= 1) {
h = hsort(arr, h, metaData);
h = hsort(arr, h, cmp, metaData);
h = h / 3;
}
System.out.println("Array sorted (shell sort) with " + metaData.compares + " compares and " + metaData.swaps + " swaps");
}
private int hsort(E[] arr, int h, MetaData metadata) {
private int hsort(E[] arr, int h, Comparator<E> cmp, SortingMetaData metaData) {
int N = arr.length;
for(int i = h; i < N; i++){
int j = i;
++metadata.compares;
while(j >= h && less((Comparable<E>) arr[j], arr[j-h])){
++metadata.swaps;
exch(arr, j, j-h);
while(j >= h && less(arr[j], arr[j-h], cmp, metaData)){
exch(arr, j, j-h, metaData);
j = j - h;
++metadata.compares;
}
}
return h;
@ -57,10 +52,21 @@ public class Shell<E> extends AbstractCustomSorts<E> {
* Will just be comparing the number of saps taken across both implementations
*/
public void insertionSort(E[] arr){
MetaData metaData = new MetaData();
int h = 1;
h = hsort(arr, h, metaData);
System.out.println("Array sorted (insertion sort) with " + metaData.compares + " compares and " + metaData.swaps + " swaps");
h = hsort(arr, h, null, null);
}
@Override
public void sort(E[] arr, Comparator<E> cmp, SortingMetaData metaData) {
if (metaData != null)
metaData.startTime();
coreSortLogic(arr, cmp, metaData);
if (metaData != null)
metaData.endTime();
}
@Override
public void sort(E[] arr, Comparator<E> cmp) {
coreSortLogic(arr, cmp, null);
}
}

34
module5/src/main/java/com/hithomelabs/princeton1/module5/SortingMetaData.java Normal file
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@ -0,0 +1,34 @@
package com.hithomelabs.princeton1.module5;
public class SortingMetaData {
private double tick;
private double tok;
private int exchanges;
private int compares;
public double timeElapsed(){
return tok - tick;
}
public void startTime(){
tick = System.nanoTime();
}
public void endTime(){
tok = System.nanoTime();
}
public void incrementCompares(){
++compares;
}
public void incrementExchanges(){
++exchanges;
}
@Override
public String toString() {
return "Time elapsed: " + this.timeElapsed() + " nano-seconds \nCompares: "+this.compares+ "\nSwaps: "+this.exchanges;
}
}

4
module5/src/test/java/com/hithomelabs/princeton1/module5/SortTest.java
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@ -11,7 +11,7 @@ import java.util.Random;
class SortTest {
private ArrayList<Apple> apples;
private AbstractCustomSorts<Apple> sortingAlgorithm;
private ComparableSort<Apple> sortingAlgorithm;
private Random random;
@BeforeEach
@ -21,7 +21,7 @@ class SortTest {
random = new Random();
}
private void testSort(AbstractCustomSorts<Apple> sortingAlgorithm) {
private void testSort(ComparableSort<Apple> sortingAlgorithm) {
for (int i = 0; i < 100; i++)
apples.add(new Apple(random.nextInt(100)));

57
module6/src/main/java/com/hithomelabs/princeton1/module6/Merge.java
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@ -1,46 +1,73 @@
package com.hithomelabs.princeton1.module6;
import com.hithomelabs.princeton1.module5.AbstractCustomSorts;
import com.hithomelabs.princeton1.module5.ComparableSort;
import com.hithomelabs.princeton1.module5.MeasurableSort;
import com.hithomelabs.princeton1.module5.SortingMetaData;
import java.util.Arrays;
import java.util.Comparator;
public class Merge<E> extends AbstractCustomSorts<E> {
public class Merge<E> implements MeasurableSort<E> {
@Override
public void sort(E[] arr) {
coreSortLogic(arr, null, null);
}
private void coreSortLogic(E[] arr, Comparator<E> cmp, SortingMetaData metaData) {
int N = arr.length;
// * * aux is a helper array required for merge
E[] aux = Arrays.copyOf(arr, N);
mergesort(arr, aux, 0, N-1);
mergesort(arr, aux, 0, N - 1, cmp, metaData);
}
private void mergesort(E[] arr, E[] aux, int lo, int hi) {
private void mergesort(E[] arr, E[] aux, int lo, int hi, Comparator<E> cmp, SortingMetaData metaData) {
if (hi <= lo) return;
int mid = lo + (hi - lo)/2;
mergesort(arr, aux, lo, mid);
mergesort(arr, aux, mid+1, hi);
merge(arr, aux, lo, mid, hi);
int mid = lo + (hi - lo) / 2;
mergesort(arr, aux, lo, mid, cmp, metaData);
mergesort(arr, aux, mid + 1, hi, cmp, metaData);
merge(arr, aux, lo, mid, hi, cmp, metaData);
}
private void merge(E[] arr, E[] aux, int lo, int mid, int hi) {
private void merge(E[] arr, E[] aux, int lo, int mid, int hi, Comparator<E> cmp, SortingMetaData metaData) {
// * * creating backup of original array
for (int i = lo; i <= hi; i++)
aux[i] = arr[i];
int i = lo;
int j = mid+1;
for (int k = lo; k <= hi; k++){
int j = mid + 1;
for (int k = lo; k <= hi; k++) {
// * If i has already reached mid, no need to compare we insert at pointer k
if(i > mid) arr[k] = aux[j++];
else if(j > hi) arr[k] = aux[i++];
else if(less((Comparable<E>) aux[i], aux[j])) arr[k] = aux[i++];
if (i > mid) {
arr[k] = aux[j++];
if (metaData != null)
metaData.incrementCompares();
} else if (j > hi) {
arr[k] = aux[i++];
if (metaData != null)
metaData.incrementCompares();
} else if (less( aux[i], aux[j], cmp, metaData)) {
arr[k] = aux[i++];
}
else arr[k] = aux[j++];
}
}
@Override
public void sort(E[] arr, Comparator<E> cmp, SortingMetaData metaData) {
if (metaData != null)
metaData.startTime();
coreSortLogic(arr, cmp, metaData);
if (metaData != null)
metaData.endTime();
}
@Override
public void sort(E[] arr, Comparator<E> cmp) {
coreSortLogic(arr, cmp, null);
}
}

4
module6/src/test/java/com/hithomelabs/princeton1/module6/MergeTest.java
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@ -1,6 +1,6 @@
package com.hithomelabs.princeton1.module6;
import com.hithomelabs.princeton1.module5.AbstractCustomSorts;
import com.hithomelabs.princeton1.module5.ComparableSort;
import com.hithomelabs.princeton1.common.Apple;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
@ -14,7 +14,7 @@ import static org.junit.jupiter.api.Assertions.*;
class MergeTest {
private AbstractCustomSorts<Apple> sortingAlgorithm;
private ComparableSort<Apple> sortingAlgorithm;
private ArrayList<Apple> apples;
private Random random;

39
module7/src/main/java/com/hithomelabs/princeton1/module7/Quick.java
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@ -1,13 +1,16 @@
package com.hithomelabs.princeton1.module7;
import com.hithomelabs.princeton1.module5.AbstractCustomSorts;
import com.hithomelabs.princeton1.module5.MeasurableSort;
import com.hithomelabs.princeton1.module5.SortingMetaData;
import java.util.Comparator;
public class Quick<E> extends AbstractCustomSorts<E> {
public class Quick<E> implements MeasurableSort<E> {
@Override
public void sort(E[] arr) {
int N = arr.length;
quickSort(arr, 0, N - 1);
quickSort(arr, 0, N - 1, null, null);
}
public void altSort(E[] arr) {
@ -31,24 +34,40 @@ public class Quick<E> extends AbstractCustomSorts<E> {
altQuickSort(arr, i, hi);
}
private void quickSort(E[] arr, int lo, int hi) {
private void quickSort(E[] arr, int lo, int hi, Comparator<E> cmp, SortingMetaData metaData) {
if (lo >= hi) return;
int i = lo;
int j = hi+1;
while(true){
while(less((Comparable<E>) arr[++i], arr[lo])){
while(less( arr[++i], arr[lo], cmp, metaData)){
if(i == hi) break;
}
while(!less((Comparable<E>) arr[--j], arr[lo])){
while(!less(arr[--j], arr[lo], cmp, metaData)){
if (j == lo ) break;
}
if(j<=i) break;
exch(arr, i , j);
exch(arr, i , j, metaData);
}
exch(arr, j, lo);
quickSort(arr, lo, j-1);
quickSort(arr, j+1, hi);
exch(arr, j, lo, metaData);
quickSort(arr, lo, j-1, cmp, metaData);
quickSort(arr, j+1, hi, cmp, metaData);
}
@Override
public void sort(E[] arr, Comparator<E> cmp) {
int N = arr.length;
quickSort(arr, 0, N - 1, cmp, null);
}
public void sort(E[] arr, Comparator<E> cmp, SortingMetaData metaData) {
if(metaData != null){
metaData.startTime();
}
int N = arr.length;
quickSort(arr, 0, N - 1, cmp, metaData);
if (metaData != null)
metaData.endTime();
}
}

12
module7/src/test/java/com/hithomelabs/princeton1/module7/QuickTest.java
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@ -46,6 +46,18 @@ class QuickTest {
Assertions.assertArrayEquals(sorted, arr);
}
@Test
@DisplayName("testing Comparator sort")
public void testComparatorSort(){
for(int i = 0; i < 100; i++)
apples.add(new Apple(random.nextInt(1000)));
Apple[] arr = apples.toArray(new Apple[apples.size()]);
quick.sort(arr, Apple.COMPARE_BY_SIZE);
apples.sort(Apple.COMPARE_BY_SIZE);
Apple[] sorted = apples.toArray(new Apple[apples.size()]);
Assertions.assertArrayEquals(sorted, arr);
}
@AfterEach
void tearDown() {