| /* |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file: |
| * |
| * Written by Doug Lea with assistance from members of JCP JSR-166 |
| * Expert Group and released to the public domain, as explained at |
| * http://creativecommons.org/licenses/publicdomain |
| */ |
| |
| /* |
| * @test |
| * @bug 4486658 |
| * @compile ProducerConsumerLoops.java |
| * @run main/timeout=3600 ProducerConsumerLoops |
| * @summary multiple producers and consumers using blocking queues |
| */ |
| |
| import java.util.concurrent.*; |
| |
| public class ProducerConsumerLoops { |
| static final int CAPACITY = 100; |
| |
| static final ExecutorService pool = Executors.newCachedThreadPool(); |
| static boolean print = false; |
| static int producerSum; |
| static int consumerSum; |
| static synchronized void addProducerSum(int x) { |
| producerSum += x; |
| } |
| |
| static synchronized void addConsumerSum(int x) { |
| consumerSum += x; |
| } |
| |
| static synchronized void checkSum() { |
| if (producerSum != consumerSum) |
| throw new Error("CheckSum mismatch"); |
| } |
| |
| public static void main(String[] args) throws Exception { |
| int maxPairs = 8; |
| int iters = 10000; |
| |
| if (args.length > 0) |
| maxPairs = Integer.parseInt(args[0]); |
| |
| print = false; |
| System.out.println("Warmup..."); |
| oneTest(1, 10000); |
| Thread.sleep(100); |
| oneTest(2, 10000); |
| Thread.sleep(100); |
| print = true; |
| |
| for (int i = 1; i <= maxPairs; i += (i+1) >>> 1) { |
| System.out.println("----------------------------------------"); |
| System.out.println("Pairs: " + i); |
| oneTest(i, iters); |
| Thread.sleep(100); |
| } |
| pool.shutdown(); |
| if (! pool.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS)) |
| throw new Error(); |
| } |
| |
| static final class LTQasSQ<T> extends LinkedTransferQueue<T> { |
| LTQasSQ() { super(); } |
| public void put(T x) { |
| try { super.transfer(x); } |
| catch (InterruptedException ex) { throw new Error(); } |
| } |
| private final static long serialVersionUID = 42; |
| } |
| |
| static final class HalfSyncLTQ<T> extends LinkedTransferQueue<T> { |
| HalfSyncLTQ() { super(); } |
| public void put(T x) { |
| if (ThreadLocalRandom.current().nextBoolean()) |
| super.put(x); |
| else { |
| try { super.transfer(x); } |
| catch (InterruptedException ex) { throw new Error(); } |
| } |
| } |
| private final static long serialVersionUID = 42; |
| } |
| |
| static void oneTest(int pairs, int iters) throws Exception { |
| oneRun(new ArrayBlockingQueue<Integer>(CAPACITY), pairs, iters); |
| oneRun(new LinkedBlockingQueue<Integer>(CAPACITY), pairs, iters); |
| oneRun(new LinkedBlockingDeque<Integer>(CAPACITY), pairs, iters); |
| oneRun(new LinkedTransferQueue<Integer>(), pairs, iters); |
| oneRun(new LTQasSQ<Integer>(), pairs, iters); |
| oneRun(new HalfSyncLTQ<Integer>(), pairs, iters); |
| oneRun(new PriorityBlockingQueue<Integer>(), pairs, iters); |
| oneRun(new SynchronousQueue<Integer>(), pairs, iters); |
| |
| if (print) |
| System.out.println("fair implementations:"); |
| |
| oneRun(new SynchronousQueue<Integer>(true), pairs, iters); |
| oneRun(new ArrayBlockingQueue<Integer>(CAPACITY, true), pairs, iters); |
| } |
| |
| static abstract class Stage implements Runnable { |
| final int iters; |
| final BlockingQueue<Integer> queue; |
| final CyclicBarrier barrier; |
| Stage (BlockingQueue<Integer> q, CyclicBarrier b, int iters) { |
| queue = q; |
| barrier = b; |
| this.iters = iters; |
| } |
| } |
| |
| static class Producer extends Stage { |
| Producer(BlockingQueue<Integer> q, CyclicBarrier b, int iters) { |
| super(q, b, iters); |
| } |
| |
| public void run() { |
| try { |
| barrier.await(); |
| int s = 0; |
| int l = hashCode(); |
| for (int i = 0; i < iters; ++i) { |
| l = LoopHelpers.compute2(l); |
| queue.put(new Integer(l)); |
| s += LoopHelpers.compute1(l); |
| } |
| addProducerSum(s); |
| barrier.await(); |
| } |
| catch (Exception ie) { |
| ie.printStackTrace(); |
| return; |
| } |
| } |
| } |
| |
| static class Consumer extends Stage { |
| Consumer(BlockingQueue<Integer> q, CyclicBarrier b, int iters) { |
| super(q, b, iters); |
| } |
| |
| public void run() { |
| try { |
| barrier.await(); |
| int l = 0; |
| int s = 0; |
| for (int i = 0; i < iters; ++i) { |
| l = LoopHelpers.compute1(queue.take().intValue()); |
| s += l; |
| } |
| addConsumerSum(s); |
| barrier.await(); |
| } |
| catch (Exception ie) { |
| ie.printStackTrace(); |
| return; |
| } |
| } |
| |
| } |
| |
| static void oneRun(BlockingQueue<Integer> q, int npairs, int iters) throws Exception { |
| if (print) |
| System.out.printf("%-18s", q.getClass().getSimpleName()); |
| LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer(); |
| CyclicBarrier barrier = new CyclicBarrier(npairs * 2 + 1, timer); |
| for (int i = 0; i < npairs; ++i) { |
| pool.execute(new Producer(q, barrier, iters)); |
| pool.execute(new Consumer(q, barrier, iters)); |
| } |
| barrier.await(); |
| barrier.await(); |
| long time = timer.getTime(); |
| checkSum(); |
| if (print) |
| System.out.println("\t: " + LoopHelpers.rightJustify(time / (iters * npairs)) + " ns per transfer"); |
| } |
| |
| } |