1 /* 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 */ 22 23 /* 24 * This file is available under and governed by the GNU General Public 25 * License version 2 only, as published by the Free Software Foundation. 26 * However, the following notice accompanied the original version of this 27 * file: 28 * 29 * Written by Doug Lea with assistance from members of JCP JSR-166 30 * Expert Group and released to the public domain, as explained at 31 * http://creativecommons.org/publicdomain/zero/1.0/ 32 */ 33 34 /* 35 * @test 36 * @bug 4486658 8031651 37 * @compile ProducerConsumerLoops.java 38 * @run main/timeout=3600 ProducerConsumerLoops 39 * @summary multiple producers and consumers using blocking queues 40 */ 41 42 import java.util.concurrent.*; 43 44 public class ProducerConsumerLoops { 45 static final int CAPACITY = 100; 46 47 static final ExecutorService pool = Executors.newCachedThreadPool(); 48 static boolean print = false; 49 static int producerSum; 50 static int consumerSum; 51 static synchronized void addProducerSum(int x) { 52 producerSum += x; 53 } 54 55 static synchronized void addConsumerSum(int x) { 56 consumerSum += x; 57 } 58 59 static synchronized void checkSum() { 60 if (producerSum != consumerSum) 61 throw new Error("CheckSum mismatch"); 62 } 63 64 public static void main(String[] args) throws Exception { 65 int maxPairs = 8; 66 int iters = 10000; 67 68 if (args.length > 0) 69 maxPairs = Integer.parseInt(args[0]); 70 71 print = false; 72 System.out.println("Warmup..."); 73 oneTest(1, 10000); 74 Thread.sleep(100); 75 oneTest(2, 10000); 76 Thread.sleep(100); 77 print = true; 78 79 for (int i = 1; i <= maxPairs; i += (i+1) >>> 1) { 80 System.out.println("----------------------------------------"); 81 System.out.println("Pairs: " + i); 82 oneTest(i, iters); 83 Thread.sleep(100); 84 } 85 pool.shutdown(); 86 if (! pool.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS)) 87 throw new Error(); 88 } 89 90 static void oneTest(int pairs, int iters) throws Exception { 91 oneRun(new ArrayBlockingQueue<Integer>(CAPACITY), pairs, iters); 92 oneRun(new LinkedBlockingQueue<Integer>(CAPACITY), pairs, iters); 93 oneRun(new LinkedBlockingDeque<Integer>(CAPACITY), pairs, iters); 94 oneRun(new LinkedTransferQueue<Integer>(), pairs, iters); 95 oneRun(new PriorityBlockingQueue<Integer>(), pairs, iters); 96 oneRun(new SynchronousQueue<Integer>(), pairs, iters); 97 98 if (print) 99 System.out.println("fair implementations:"); 100 101 oneRun(new SynchronousQueue<Integer>(true), pairs, iters); 102 oneRun(new ArrayBlockingQueue<Integer>(CAPACITY, true), pairs, iters); 103 } 104 105 abstract static class Stage implements Runnable { 106 final int iters; 107 final BlockingQueue<Integer> queue; 108 final CyclicBarrier barrier; 109 Stage(BlockingQueue<Integer> q, CyclicBarrier b, int iters) { 110 queue = q; 111 barrier = b; 112 this.iters = iters; 113 } 114 } 115 116 static class Producer extends Stage { 117 Producer(BlockingQueue<Integer> q, CyclicBarrier b, int iters) { 118 super(q, b, iters); 119 } 120 121 public void run() { 122 try { 123 barrier.await(); 124 int s = 0; 125 int l = hashCode(); 126 for (int i = 0; i < iters; ++i) { 127 l = LoopHelpers.compute2(l); 128 queue.put(new Integer(l)); 129 s += LoopHelpers.compute1(l); 130 } 131 addProducerSum(s); 132 barrier.await(); 133 } 134 catch (Exception ie) { 135 ie.printStackTrace(); 136 return; 137 } 138 } 139 } 140 141 static class Consumer extends Stage { 142 Consumer(BlockingQueue<Integer> q, CyclicBarrier b, int iters) { 143 super(q, b, iters); 144 } 145 146 public void run() { 147 try { 148 barrier.await(); 149 int l = 0; 150 int s = 0; 151 for (int i = 0; i < iters; ++i) { 152 l = LoopHelpers.compute1(queue.take().intValue()); 153 s += l; 154 } 155 addConsumerSum(s); 156 barrier.await(); 157 } 158 catch (Exception ie) { 159 ie.printStackTrace(); 160 return; 161 } 162 } 163 164 } 165 166 static void oneRun(BlockingQueue<Integer> q, int npairs, int iters) throws Exception { 167 if (print) 168 System.out.printf("%-18s", q.getClass().getSimpleName()); 169 LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer(); 170 CyclicBarrier barrier = new CyclicBarrier(npairs * 2 + 1, timer); 171 for (int i = 0; i < npairs; ++i) { 172 pool.execute(new Producer(q, barrier, iters)); 173 pool.execute(new Consumer(q, barrier, iters)); 174 } 175 barrier.await(); 176 barrier.await(); 177 long time = timer.getTime(); 178 checkSum(); 179 if (print) 180 System.out.println("\t: " + LoopHelpers.rightJustify(time / (iters * npairs)) + " ns per transfer"); 181 } 182 183 }