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/* |
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* @test |
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* @synopsis check ordering for blocking queues with 1 producer and multiple consumers |
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*/ |
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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain. Use, modify, and |
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* redistribute this code in any way without acknowledgement. |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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import java.util.concurrent.*; |
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import java.util.concurrent.ArrayBlockingQueue; |
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import java.util.concurrent.BlockingQueue; |
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import java.util.concurrent.CyclicBarrier; |
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import java.util.concurrent.ExecutorService; |
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import java.util.concurrent.Executors; |
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import java.util.concurrent.LinkedBlockingDeque; |
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import java.util.concurrent.LinkedBlockingQueue; |
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import java.util.concurrent.LinkedTransferQueue; |
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import java.util.concurrent.PriorityBlockingQueue; |
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import java.util.concurrent.SynchronousQueue; |
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public class SingleProducerMultipleConsumerLoops { |
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static final int CAPACITY = 100; |
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static final int NCPUS = Runtime.getRuntime().availableProcessors(); |
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|
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// Number of puts by producers or takes by consumers |
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static final int ITERS = 1 << 20; |
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static final ExecutorService pool = Executors.newCachedThreadPool(); |
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static boolean print = false; |
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// Number of elements passed around -- must be power of two |
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// Elements are reused from pool to minimize alloc impact |
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static final int POOL_SIZE = 1 << 8; |
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static final int POOL_MASK = POOL_SIZE-1; |
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static final Integer[] intPool = new Integer[POOL_SIZE]; |
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static { |
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for (int i = 0; i < POOL_SIZE; ++i) |
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intPool[i] = Integer.valueOf(i); |
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} |
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|
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public static void main(String[] args) throws Exception { |
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int maxConsumers = 100; |
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int iters = 10000; |
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int maxn = 12; |
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if (args.length > 0) |
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maxConsumers = Integer.parseInt(args[0]); |
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if (args.length > 0) |
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maxn = Integer.parseInt(args[0]); |
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print = false; |
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System.out.println("Warmup..."); |
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oneTest(1, 10000); |
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Thread.sleep(100); |
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oneTest(2, 10000); |
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Thread.sleep(100); |
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warmup(); |
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print = true; |
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|
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for (int i = 1; i <= maxConsumers; i += (i+1) >>> 1) { |
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for (int k = 1, i = 1; i <= maxn;) { |
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System.out.println("Consumers:" + i); |
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oneTest(i, iters); |
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Thread.sleep(100); |
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oneTest(i, ITERS); |
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if (i == k) { |
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k = i << 1; |
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i = i + (i >>> 1); |
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} |
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else |
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i = k; |
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} |
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pool.shutdown(); |
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} |
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} |
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static void oneTest(int consumers, int iters) throws Exception { |
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static void warmup() throws Exception { |
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print = false; |
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System.out.print("Warmup "); |
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int it = 2000; |
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for (int j = 5; j > 0; --j) { |
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oneTest(j, it); |
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System.out.print("."); |
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it += 1000; |
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} |
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System.gc(); |
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it = 20000; |
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for (int j = 5; j > 0; --j) { |
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oneTest(j, it); |
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System.out.print("."); |
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it += 10000; |
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} |
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System.gc(); |
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System.out.println(); |
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} |
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static void oneTest(int n, int iters) throws Exception { |
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int fairIters = iters/16; |
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|
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Thread.sleep(100); // System.gc(); |
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if (print) |
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System.out.print("ArrayBlockingQueue "); |
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oneRun(new ArrayBlockingQueue<Integer>(CAPACITY), consumers, iters); |
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System.out.print("LinkedTransferQueue "); |
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oneRun(new LinkedTransferQueue<Integer>(), n, iters); |
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Thread.sleep(100); // System.gc(); |
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if (print) |
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System.out.print("LinkedBlockingQueue "); |
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oneRun(new LinkedBlockingQueue<Integer>(CAPACITY), consumers, iters); |
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oneRun(new LinkedBlockingQueue<Integer>(), n, iters); |
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Thread.sleep(100); // System.gc(); |
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if (print) |
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System.out.print("PriorityBlockingQueue "); |
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oneRun(new PriorityBlockingQueue<Integer>(), consumers, iters/10); |
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System.out.print("LinkedBlockingQueue(cap)"); |
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oneRun(new LinkedBlockingQueue<Integer>(POOL_SIZE), n, iters); |
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Thread.sleep(100); // System.gc(); |
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if (print) |
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System.out.print("LinkedBlockingDeque "); |
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oneRun(new LinkedBlockingDeque<Integer>(), n, iters); |
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Thread.sleep(100); // System.gc(); |
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if (print) |
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System.out.print("ArrayBlockingQueue "); |
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oneRun(new ArrayBlockingQueue<Integer>(POOL_SIZE), n, iters); |
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Thread.sleep(100); // System.gc(); |
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if (print) |
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System.out.print("SynchronousQueue "); |
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oneRun(new SynchronousQueue<Integer>(), consumers, iters); |
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oneRun(new SynchronousQueue<Integer>(), n, iters); |
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Thread.sleep(100); // System.gc(); |
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if (print) |
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System.out.print("SynchronousQueue(fair) "); |
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oneRun(new SynchronousQueue<Integer>(true), n, iters); |
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Thread.sleep(100); // System.gc(); |
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if (print) |
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System.out.print("LinkedTransferQueue(xfer)"); |
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oneRun(new LTQasSQ<Integer>(), n, iters); |
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Thread.sleep(100); // System.gc(); |
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if (print) |
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System.out.print("LinkedTransferQueue(half)"); |
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oneRun(new HalfSyncLTQ<Integer>(), n, iters); |
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Thread.sleep(100); // System.gc(); |
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if (print) |
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System.out.print("PriorityBlockingQueue "); |
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oneRun(new PriorityBlockingQueue<Integer>(), n, fairIters); |
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Thread.sleep(100); // System.gc(); |
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if (print) |
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System.out.print("ArrayBlockingQueue(fair)"); |
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oneRun(new ArrayBlockingQueue<Integer>(CAPACITY, true), consumers, iters/10); |
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oneRun(new ArrayBlockingQueue<Integer>(POOL_SIZE, true), n, fairIters); |
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} |
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static abstract class Stage implements Runnable { |
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abstract static class Stage implements Runnable { |
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final int iters; |
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final BlockingQueue<Integer> queue; |
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final CyclicBarrier barrier; |
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volatile int result; |
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Stage (BlockingQueue<Integer> q, CyclicBarrier b, int iters) { |
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queue = q; |
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Stage(BlockingQueue<Integer> q, CyclicBarrier b, int iters) { |
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queue = q; |
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barrier = b; |
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this.iters = iters; |
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} |
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public void run() { |
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try { |
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barrier.await(); |
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int r = hashCode(); |
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for (int i = 0; i < iters; ++i) { |
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queue.put(new Integer(i)); |
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r = LoopHelpers.compute7(r); |
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Integer v = intPool[r & POOL_MASK]; |
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queue.put(v); |
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} |
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barrier.await(); |
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result = 432; |
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} |
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catch (Exception ie) { |
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ie.printStackTrace(); |
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return; |
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catch (Exception ie) { |
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ie.printStackTrace(); |
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return; |
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} |
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} |
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} |
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static class Consumer extends Stage { |
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Consumer(BlockingQueue<Integer> q, CyclicBarrier b, int iters) { |
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Consumer(BlockingQueue<Integer> q, CyclicBarrier b, int iters) { |
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super(q, b, iters); |
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} |
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barrier.await(); |
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int l = 0; |
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int s = 0; |
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int last = -1; |
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for (int i = 0; i < iters; ++i) { |
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Integer item = queue.take(); |
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int v = item.intValue(); |
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if (v < last) |
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throw new Error("Out-of-Order transfer"); |
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last = v; |
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l = LoopHelpers.compute1(v); |
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s += l; |
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s += item.intValue(); |
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} |
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barrier.await(); |
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result = s; |
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if (s == 0) System.out.print(" "); |
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} |
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catch (Exception ie) { |
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ie.printStackTrace(); |
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return; |
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catch (Exception ie) { |
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ie.printStackTrace(); |
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return; |
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} |
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} |
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System.out.println("\t: " + LoopHelpers.rightJustify(time / (iters * nconsumers)) + " ns per transfer"); |
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} |
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static final class LTQasSQ<T> extends LinkedTransferQueue<T> { |
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LTQasSQ() { super(); } |
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public void put(T x) { |
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try { super.transfer(x); } |
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catch (InterruptedException ex) { throw new Error(ex); } |
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} |
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} |
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static final class HalfSyncLTQ<T> extends LinkedTransferQueue<T> { |
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int calls; |
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HalfSyncLTQ() { super(); } |
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public void put(T x) { |
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if ((++calls & 1) == 0) |
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super.put(x); |
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else { |
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try { super.transfer(x); } |
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catch (InterruptedException ex) { throw new Error(ex); } |
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} |
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} |
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} |
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} |
