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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, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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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.Random; |
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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.Phaser; |
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import java.util.concurrent.PriorityBlockingQueue; |
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import java.util.concurrent.SynchronousQueue; |
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public class MultipleProducersSingleConsumerLoops { |
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static final int CAPACITY = 100; |
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static final int NCPUS = Runtime.getRuntime().availableProcessors(); |
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static final ExecutorService pool = Executors.newCachedThreadPool(); |
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static boolean print = false; |
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static int producerSum; |
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static int consumerSum; |
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static synchronized void addProducerSum(int x) { |
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producerSum += x; |
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} |
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throw new Error("CheckSum mismatch"); |
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} |
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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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// Number of puts by producers or takes by consumers |
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static final int ITERS = 1 << 20; |
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|
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// max lag between a producer and consumer to avoid |
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// this becoming a GC test rather than queue test. |
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static final int LAG = (1 << 12); |
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static final int LAG_MASK = LAG - 1; |
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|
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public static void main(String[] args) throws Exception { |
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int maxProducers = 100; |
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int iters = 100000; |
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int maxn = 12; // NCPUS * 3 / 2; |
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if (args.length > 0) |
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maxProducers = 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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for (int i = 1; i <= maxProducers; i += (i+1) >>> 1) { |
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for (int k = 1, i = 1; i <= maxn;) { |
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System.out.println("Producers:" + 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 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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static void oneTest(int producers, int iters) throws Exception { |
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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), producers, 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), producers, iters); |
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oneRun(new LinkedBlockingQueue<Integer>(), n, iters); |
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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("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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// Don't run PBQ since can legitimately run out of memory |
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// if (print) |
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// System.out.print("PriorityBlockingQueue "); |
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// oneRun(new PriorityBlockingQueue<Integer>(), producers, 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>(), producers, 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), producers, iters); |
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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), producers, 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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Stage (BlockingQueue<Integer> q, CyclicBarrier b, int iters) { |
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queue = q; |
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final Phaser lagPhaser; |
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final int lag; |
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Stage(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s, |
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int iters, int lag) { |
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queue = q; |
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barrier = b; |
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lagPhaser = s; |
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this.iters = iters; |
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this.lag = lag; |
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} |
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} |
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static class Producer extends Stage { |
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Producer(BlockingQueue<Integer> q, CyclicBarrier b, int iters) { |
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super(q, b, iters); |
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Producer(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s, |
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int iters, int lag) { |
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super(q, b, s, iters, lag); |
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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 s = 0; |
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int l = hashCode(); |
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int ps = 0; |
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int r = hashCode(); |
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int j = 0; |
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for (int i = 0; i < iters; ++i) { |
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l = LoopHelpers.compute1(l); |
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l = LoopHelpers.compute2(l); |
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queue.put(new Integer(l)); |
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s += l; |
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r = LoopHelpers.compute7(r); |
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Integer v = intPool[r & POOL_MASK]; |
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int k = v.intValue(); |
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queue.put(v); |
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ps += k; |
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if (++j == lag) { |
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j = 0; |
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lagPhaser.arriveAndAwaitAdvance(); |
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} |
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} |
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addProducerSum(s); |
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addProducerSum(ps); |
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barrier.await(); |
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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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super(q, b, iters); |
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Consumer(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s, |
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int iters, int lag) { |
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super(q, b, s, iters, lag); |
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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 s = 0; |
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int cs = 0; |
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int j = 0; |
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for (int i = 0; i < iters; ++i) { |
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s += queue.take().intValue(); |
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Integer v = queue.take(); |
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int k = v.intValue(); |
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cs += k; |
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if (++j == lag) { |
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j = 0; |
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lagPhaser.arriveAndAwaitAdvance(); |
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} |
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} |
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addConsumerSum(s); |
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addConsumerSum(cs); |
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barrier.await(); |
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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 void oneRun(BlockingQueue<Integer> q, int nproducers, int iters) throws Exception { |
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static void oneRun(BlockingQueue<Integer> q, int n, int iters) throws Exception { |
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LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer(); |
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CyclicBarrier barrier = new CyclicBarrier(nproducers + 2, timer); |
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for (int i = 0; i < nproducers; ++i) { |
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pool.execute(new Producer(q, barrier, iters)); |
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CyclicBarrier barrier = new CyclicBarrier(n + 2, timer); |
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Phaser s = new Phaser(n + 1); |
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for (int i = 0; i < n; ++i) { |
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pool.execute(new Producer(q, barrier, s, iters, LAG)); |
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} |
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pool.execute(new Consumer(q, barrier, iters * nproducers)); |
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pool.execute(new Consumer(q, barrier, s, iters * n, LAG * n)); |
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barrier.await(); |
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barrier.await(); |
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long time = timer.getTime(); |
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checkSum(); |
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if (print) |
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System.out.println("\t: " + LoopHelpers.rightJustify(time / (iters * nproducers)) + " ns per transfer"); |
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System.out.println("\t: " + LoopHelpers.rightJustify(time / (iters * (n + 1))) + " 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(); } |
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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) { |
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throw new Error(); |
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} |
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} |
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} |
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} |
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} |
