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HW2: all done including bonus

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This commit is contained in:
Claudio Maggioni 2019-11-11 00:36:16 +01:00
parent 171a7aa764
commit ffd8fbf895
10 changed files with 477 additions and 43 deletions
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26
hw2/Ex2/.idea/workspace.xml
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11
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20
hw2/Ex3/src/parallel/ForkJoinPoolPrimeCounter.java
View file

@ -4,6 +4,7 @@ import util.Prime;
import util.PrimeCounter; import util.PrimeCounter;
import java.util.concurrent.ForkJoinPool; import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.RecursiveTask; import java.util.concurrent.RecursiveTask;
import java.util.concurrent.ThreadPoolExecutor;
public class ForkJoinPoolPrimeCounter implements PrimeCounter { public class ForkJoinPoolPrimeCounter implements PrimeCounter {
@ -15,10 +16,8 @@ public class ForkJoinPoolPrimeCounter implements PrimeCounter {
} }
public int countPrimes(int[] nums) { public int countPrimes(int[] nums) {
int count = 0; final ForkJoinPool p = new ForkJoinPool();
// TODO: Complete method countPrimes return p.invoke(new CountPrimes(nums, 0, nums.length - 1));
return count;
} }
private static class CountPrimes extends RecursiveTask<Integer> { private static class CountPrimes extends RecursiveTask<Integer> {
@ -47,15 +46,14 @@ public class ForkJoinPoolPrimeCounter implements PrimeCounter {
return count; return count;
} }
else { else {
int right, left, rightAns, leftAns; final int mid = low + (high - low) / 2;
right = left = rightAns = leftAns = 0;
right = low + ((int) Math.floor((high - low) / 2 ) - 1);
left = low + ((int) Math.ceil((high - low) / 2 ));
// TODO: Complete method compute
final CountPrimes leftTask = new CountPrimes(nums, low, mid);
final CountPrimes rightTask = new CountPrimes(nums, mid + 1, high);
rightTask.fork();
return leftAns + rightAns;
return leftTask.compute() + rightTask.join();
} }
} }
} }

14
hw2/Ex3/src/parallel/StreamsPrimeCounter.java Normal file
View file

@ -0,0 +1,14 @@
package parallel;
import util.Prime;
import util.PrimeCounter;
import java.util.Arrays;
public class StreamsPrimeCounter implements PrimeCounter {
@Override
public int countPrimes(int[] nums) throws Exception {
return Arrays.stream(nums).parallel().map(n -> Prime.isPrime(n) ? 1 : 0).sum();
}
}

21
hw2/Ex3/src/parallel/ThreadPoolPrimeCounter.java
View file

@ -4,11 +4,7 @@ import util.Prime;
import java.util.List; import java.util.List;
import util.PrimeCounter; import util.PrimeCounter;
import java.util.ArrayList; import java.util.ArrayList;
import java.util.concurrent.Future; import java.util.concurrent.*;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.Callable;
import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;
public class ThreadPoolPrimeCounter implements PrimeCounter { public class ThreadPoolPrimeCounter implements PrimeCounter {
@ -19,9 +15,20 @@ public class ThreadPoolPrimeCounter implements PrimeCounter {
} }
public int countPrimes(int[] nums) throws Exception { public int countPrimes(int[] nums) throws Exception {
int count = 0; final ExecutorService e = Executors.newFixedThreadPool(numThreads);
// TODO: Complete method countPrimes final int step = (int) Math.ceil((double) nums.length / numThreads);
final List<Future<Integer>> results = new ArrayList<>(numThreads);
for (int i = 0; i < nums.length; i += step) {
results.add(e.submit(new CountPrimes(nums, i, i + step)));
}
e.shutdown();
int count = 0;
for (Future<Integer> result : results) {
count += result.get();
}
return count; return count;
} }

19
hw2/Ex3/src/test/Tester.java
View file

@ -1,6 +1,10 @@
package test; package test;
import parallel.StreamsPrimeCounter;
import util.PrimeCounter; import util.PrimeCounter;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.IntStream; import java.util.stream.IntStream;
import parallel.CallablePrimeCounter; import parallel.CallablePrimeCounter;
import parallel.ThreadPoolPrimeCounter; import parallel.ThreadPoolPrimeCounter;
@ -13,22 +17,26 @@ public class Tester {
public static final int LOW = 2; public static final int LOW = 2;
public static final int HIGH = 11201609; public static final int HIGH = 11201609;
private PrimeCounter strategy; private PrimeCounter strategy;
private static Map<int[], Long> checkMap = new HashMap<>();
private void setStrategy(PrimeCounter strategy) { private void setStrategy(PrimeCounter strategy) {
this.strategy = strategy; this.strategy = strategy;
} }
private int countPrimes(int[] array) { private long countPrimes(int[] array) {
return new SequentialPrimeCounter().countPrimes(array); return new SequentialPrimeCounter().countPrimes(array);
} }
private void testImplementation(int[] array, String name) private void testImplementation(int[] array, String name)
throws Exception { throws Exception {
checkMap.computeIfAbsent(array, k -> countPrimes(array));
long result = checkMap.get(array);
long startTime = System.nanoTime(); long startTime = System.nanoTime();
int count = strategy.countPrimes(array); int count = strategy.countPrimes(array);
long endTime = System.nanoTime(); long endTime = System.nanoTime();
long result = countPrimes(array);
if (count != result) { if (count != result) {
// Informing if the implementation failed // Informing if the implementation failed
System.err.printf("- ERROR: %s; Expected: %d; Found: %d\n", System.err.printf("- ERROR: %s; Expected: %d; Found: %d\n",
@ -55,8 +63,6 @@ public class Tester {
tester.setStrategy(new CallablePrimeCounter(NUM_THREADS)); tester.setStrategy(new CallablePrimeCounter(NUM_THREADS));
tester.testImplementation(numbers, "Parallel - Callable version"); tester.testImplementation(numbers, "Parallel - Callable version");
// TODO: Uncomment to test additional implementations
/*
// Parallel - ThreadPool implementation // Parallel - ThreadPool implementation
tester.setStrategy(new ThreadPoolPrimeCounter(NUM_THREADS)); tester.setStrategy(new ThreadPoolPrimeCounter(NUM_THREADS));
tester.testImplementation(numbers, "Parallel - ThreadPool version"); tester.testImplementation(numbers, "Parallel - ThreadPool version");
@ -66,8 +72,7 @@ public class Tester {
tester.testImplementation(numbers, "Parallel - ForkJoinPool version"); tester.testImplementation(numbers, "Parallel - ForkJoinPool version");
// Parallel - Streams implementation - BONUS // Parallel - Streams implementation - BONUS
//tester.setStrategy(new StreamsPrimeCounter()); tester.setStrategy(new StreamsPrimeCounter());
//tester.testImplementation(numbers, "Parallel - Streams version"); tester.testImplementation(numbers, "Parallel - Streams version");
*/
} }
} }