HW2: all done including bonus
This commit is contained in:
Claudio Maggioni
parent
171a7aa764
commit
ffd8fbf895
10 changed files with 477 additions and 43 deletions
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@ -1,17 +1,7 @@
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11
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11
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||||
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|
||||
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||||
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<state key="FacetStructureConfigurable.UI">
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<splitter-proportions>
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<option name="proportions">
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<state key="ModuleStructureConfigurable.UI">
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<settings>
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<last-edited>Ex3</last-edited>
|
||||
<splitter-proportions>
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<option name="proportions">
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<list>
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<option value="0.2" />
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<option value="0.6" />
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<state key="ProjectLibrariesConfigurable.UI">
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<splitter-proportions>
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<option name="proportions">
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<list>
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<option value="0.2" />
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</list>
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</settings>
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</state>
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</states>
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|
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</project>
|
||||
|
|
@ -4,6 +4,7 @@ import util.Prime;
|
|||
import util.PrimeCounter;
|
||||
import java.util.concurrent.ForkJoinPool;
|
||||
import java.util.concurrent.RecursiveTask;
|
||||
import java.util.concurrent.ThreadPoolExecutor;
|
||||
|
||||
public class ForkJoinPoolPrimeCounter implements PrimeCounter {
|
||||
|
||||
|
|
@ -15,10 +16,8 @@ public class ForkJoinPoolPrimeCounter implements PrimeCounter {
|
|||
}
|
||||
|
||||
public int countPrimes(int[] nums) {
|
||||
int count = 0;
|
||||
// TODO: Complete method countPrimes
|
||||
|
||||
return count;
|
||||
final ForkJoinPool p = new ForkJoinPool();
|
||||
return p.invoke(new CountPrimes(nums, 0, nums.length - 1));
|
||||
}
|
||||
|
||||
private static class CountPrimes extends RecursiveTask<Integer> {
|
||||
|
|
@ -47,15 +46,14 @@ public class ForkJoinPoolPrimeCounter implements PrimeCounter {
|
|||
return count;
|
||||
}
|
||||
else {
|
||||
int right, left, rightAns, leftAns;
|
||||
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 int mid = low + (high - low) / 2;
|
||||
|
||||
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
14
hw2/Ex3/src/parallel/StreamsPrimeCounter.java
Normal 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();
|
||||
}
|
||||
}
|
||||
|
|
@ -4,11 +4,7 @@ import util.Prime;
|
|||
import java.util.List;
|
||||
import util.PrimeCounter;
|
||||
import java.util.ArrayList;
|
||||
import java.util.concurrent.Future;
|
||||
import java.util.concurrent.TimeUnit;
|
||||
import java.util.concurrent.Callable;
|
||||
import java.util.concurrent.Executors;
|
||||
import java.util.concurrent.ExecutorService;
|
||||
import java.util.concurrent.*;
|
||||
|
||||
public class ThreadPoolPrimeCounter implements PrimeCounter {
|
||||
|
||||
|
|
@ -19,9 +15,20 @@ public class ThreadPoolPrimeCounter implements PrimeCounter {
|
|||
}
|
||||
|
||||
public int countPrimes(int[] nums) throws Exception {
|
||||
int count = 0;
|
||||
// TODO: Complete method countPrimes
|
||||
final ExecutorService e = Executors.newFixedThreadPool(numThreads);
|
||||
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;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -1,6 +1,10 @@
|
|||
package test;
|
||||
|
||||
import parallel.StreamsPrimeCounter;
|
||||
import util.PrimeCounter;
|
||||
|
||||
import java.util.HashMap;
|
||||
import java.util.Map;
|
||||
import java.util.stream.IntStream;
|
||||
import parallel.CallablePrimeCounter;
|
||||
import parallel.ThreadPoolPrimeCounter;
|
||||
|
|
@ -13,22 +17,26 @@ public class Tester {
|
|||
public static final int LOW = 2;
|
||||
public static final int HIGH = 11201609;
|
||||
private PrimeCounter strategy;
|
||||
private static Map<int[], Long> checkMap = new HashMap<>();
|
||||
|
||||
private void setStrategy(PrimeCounter strategy) {
|
||||
this.strategy = strategy;
|
||||
}
|
||||
|
||||
private int countPrimes(int[] array) {
|
||||
private long countPrimes(int[] array) {
|
||||
return new SequentialPrimeCounter().countPrimes(array);
|
||||
}
|
||||
|
||||
private void testImplementation(int[] array, String name)
|
||||
throws Exception {
|
||||
|
||||
checkMap.computeIfAbsent(array, k -> countPrimes(array));
|
||||
long result = checkMap.get(array);
|
||||
|
||||
long startTime = System.nanoTime();
|
||||
int count = strategy.countPrimes(array);
|
||||
long endTime = System.nanoTime();
|
||||
long result = countPrimes(array);
|
||||
|
||||
if (count != result) {
|
||||
// Informing if the implementation failed
|
||||
System.err.printf("- ERROR: %s; Expected: %d; Found: %d\n",
|
||||
|
|
@ -55,8 +63,6 @@ public class Tester {
|
|||
tester.setStrategy(new CallablePrimeCounter(NUM_THREADS));
|
||||
tester.testImplementation(numbers, "Parallel - Callable version");
|
||||
|
||||
// TODO: Uncomment to test additional implementations
|
||||
/*
|
||||
// Parallel - ThreadPool implementation
|
||||
tester.setStrategy(new ThreadPoolPrimeCounter(NUM_THREADS));
|
||||
tester.testImplementation(numbers, "Parallel - ThreadPool version");
|
||||
|
|
@ -66,8 +72,7 @@ public class Tester {
|
|||
tester.testImplementation(numbers, "Parallel - ForkJoinPool version");
|
||||
|
||||
// Parallel - Streams implementation - BONUS
|
||||
//tester.setStrategy(new StreamsPrimeCounter());
|
||||
//tester.testImplementation(numbers, "Parallel - Streams version");
|
||||
*/
|
||||
tester.setStrategy(new StreamsPrimeCounter());
|
||||
tester.testImplementation(numbers, "Parallel - Streams version");
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Reference in a new issue