test/loops/ProducerConsumerLoops.java

/*
 * 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/publicdomain/zero/1.0/
 */

import java.util.*;
import java.util.concurrent.*;
//import jsr166y.*;

public class ProducerConsumerLoops {
    static final int NCPUS = Runtime.getRuntime().availableProcessors();
    static final Random rng = new Random();
    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");
    }

    // Number of elements passed around -- must be power of two
    // Elements are reused from pool to minimize alloc impact
    static final int POOL_SIZE = 1 << 7;
    static final int POOL_MASK = POOL_SIZE-1;
    static final Integer[] intPool = new Integer[POOL_SIZE];
    static {
        for (int i = 0; i < POOL_SIZE; ++i)
            intPool[i] = Integer.valueOf(i);
    }

    // Number of puts by producers or takes by consumers
    static final int ITERS = 1 << 20;

    // max lag between a producer and consumer to avoid
    // this becoming a GC test rather than queue test.
    // Used only per-pair to lessen impact on queue sync
    static final int LAG_MASK = (1 << 12) - 1;

    public static void main(String[] args) throws Exception {
        int maxPairs = NCPUS * 3 / 2;

        if (args.length > 0)
            maxPairs = Integer.parseInt(args[0]);

        warmup();
        print = true;
        for (int k = 1, i = 1; i <= maxPairs;) {
            System.out.println("Pairs:" + i);
            oneTest(i, ITERS);
            if (i == k) {
                k = i << 1;
                i = i + (i >>> 1);
            }
            else
                i = k;
        }
        pool.shutdown();
    }

    static void warmup() throws Exception {
        print = false;
        System.out.print("Warmup ");
        int it = 2000;
        for (int j = 5; j > 0; --j) {
            oneTest(j, it);
            System.out.print(".");
            it += 1000;
        }
        System.gc();
        it = 20000;
        for (int j = 5; j > 0; --j) {
            oneTest(j, it);
            System.out.print(".");
            it += 10000;
        }
        System.gc();
        System.out.println();
    }

    static void oneTest(int n, int iters) throws Exception {
        int fairIters = iters/16;

        Thread.sleep(100); // System.gc();
        if (print)
            System.out.print("LinkedTransferQueue     ");
        oneRun(new LinkedTransferQueue<Integer>(), n, iters);

        Thread.sleep(100); // System.gc();
        if (print)
            System.out.print("LinkedBlockingQueue     ");
        oneRun(new LinkedBlockingQueue<Integer>(), n, iters);

        Thread.sleep(100); // System.gc();
        if (print)
            System.out.print("LinkedBlockingQueue(cap)");
        oneRun(new LinkedBlockingQueue<Integer>(POOL_SIZE), n, iters);

        Thread.sleep(100); // System.gc();
        if (print)
            System.out.print("LinkedBlockingDeque     ");
        oneRun(new LinkedBlockingDeque<Integer>(), n, iters);

        Thread.sleep(100); // System.gc();
        if (print)
            System.out.print("ArrayBlockingQueue      ");
        oneRun(new ArrayBlockingQueue<Integer>(POOL_SIZE), n, iters);

        Thread.sleep(100); // System.gc();
        if (print)
            System.out.print("SynchronousQueue        ");
        oneRun(new SynchronousQueue<Integer>(), n, iters);


        Thread.sleep(100); // System.gc();
        if (print)
            System.out.print("SynchronousQueue(fair)  ");
        oneRun(new SynchronousQueue<Integer>(true), n, iters);

        Thread.sleep(100); // System.gc();
        if (print)
            System.out.print("LinkedTransferQueue(xfer)");
        oneRun(new LTQasSQ<Integer>(), n, iters);

        Thread.sleep(100); // System.gc();
        if (print)
            System.out.print("LinkedTransferQueue(half)");
        oneRun(new HalfSyncLTQ<Integer>(), n, iters);

        Thread.sleep(100); // System.gc();
        if (print)
            System.out.print("PriorityBlockingQueue   ");
        oneRun(new PriorityBlockingQueue<Integer>(), n, fairIters);

        Thread.sleep(100); // System.gc();
        if (print)
            System.out.print("ArrayBlockingQueue(fair)");
        oneRun(new ArrayBlockingQueue<Integer>(POOL_SIZE, true), n, fairIters);

    }

    abstract static class Stage implements Runnable {
        final int iters;
        final BlockingQueue<Integer> queue;
        final CyclicBarrier barrier;
        final Phaser lagPhaser;
        Stage(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s, int iters) {
            queue = q;
            barrier = b;
            lagPhaser = s;
            this.iters = iters;
        }
    }

    static class Producer extends Stage {
        Producer(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s,
                 int iters) {
            super(q, b, s, iters);
        }

        public void run() {
            try {
                barrier.await();
                int ps = 0;
                int r = hashCode();
                for (int i = 0; i < iters; ++i) {
                    r = LoopHelpers.compute7(r);
                    Integer v = intPool[r & POOL_MASK];
                    int k = v.intValue();
                    queue.put(v);
                    ps += k;
                    if ((i & LAG_MASK) == LAG_MASK)
                        lagPhaser.arriveAndAwaitAdvance();
                }
                addProducerSum(ps);
                barrier.await();
            }
            catch (Exception ie) {
                ie.printStackTrace();
                return;
            }
        }
    }

    static class Consumer extends Stage {
        Consumer(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s,
                 int iters) {
            super(q, b, s, iters);
        }

        public void run() {
            try {
                barrier.await();
                int cs = 0;
                for (int i = 0; i < iters; ++i) {
                    Integer v = queue.take();
                    int k = v.intValue();
                    cs += k;
                    if ((i & LAG_MASK) == LAG_MASK)
                        lagPhaser.arriveAndAwaitAdvance();
                }
                addConsumerSum(cs);
                barrier.await();
            }
            catch (Exception ie) {
                ie.printStackTrace();
                return;
            }
        }

    }

    static void oneRun(BlockingQueue<Integer> q, int n, int iters) throws Exception {
        LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
        CyclicBarrier barrier = new CyclicBarrier(n * 2 + 1, timer);
        for (int i = 0; i < n; ++i) {
            Phaser s = new Phaser(2);
            pool.execute(new Producer(q, barrier, s, iters));
            pool.execute(new Consumer(q, barrier, s, iters));
        }
        barrier.await();
        barrier.await();
        long time = timer.getTime();
        checkSum();
        if (print)
            System.out.println("\t: " + LoopHelpers.rightJustify(time / (iters * n)) + " ns per transfer");
    }

    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(); }
        }
    }

    static final class HalfSyncLTQ<T> extends LinkedTransferQueue<T> {
        int calls;
        HalfSyncLTQ() { super(); }
        public void put(T x) {
            if ((++calls & 1) == 0)
                super.put(x);
            else {
                try { super.transfer(x);
                } catch (InterruptedException ex) {
                    throw new Error();
                }
            }
        }
    }
}
Revision:	1.8
Committed:	Thu Dec 18 18:13:06 2014 UTC (9 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.7:	+1 -2 lines
Log Message:	move k = 1 into loop initializer
#	User	Rev	Content
1	dl	1.1	/*
2			* Written by Doug Lea with assistance from members of JCP JSR-166
3	dl	1.2	* Expert Group and released to the public domain, as explained at
4	jsr166	1.7	* http://creativecommons.org/publicdomain/zero/1.0/
5	dl	1.1	*/
6
7	dl	1.3	import java.util.*;
8	dl	1.1	import java.util.concurrent.*;
9	dl	1.3	//import jsr166y.*;
10	dl	1.1
11			public class ProducerConsumerLoops {
12	dl	1.3	static final int NCPUS = Runtime.getRuntime().availableProcessors();
13			static final Random rng = new Random();
14	dl	1.1	static final ExecutorService pool = Executors.newCachedThreadPool();
15			static boolean print = false;
16			static int producerSum;
17			static int consumerSum;
18			static synchronized void addProducerSum(int x) {
19			producerSum += x;
20			}
21
22			static synchronized void addConsumerSum(int x) {
23			consumerSum += x;
24			}
25
26			static synchronized void checkSum() {
27			if (producerSum != consumerSum)
28			throw new Error("CheckSum mismatch");
29			}
30
31	dl	1.3	// Number of elements passed around -- must be power of two
32			// Elements are reused from pool to minimize alloc impact
33			static final int POOL_SIZE = 1 << 7;
34			static final int POOL_MASK = POOL_SIZE-1;
35			static final Integer[] intPool = new Integer[POOL_SIZE];
36			static {
37	jsr166	1.4	for (int i = 0; i < POOL_SIZE; ++i)
38	dl	1.3	intPool[i] = Integer.valueOf(i);
39			}
40
41			// Number of puts by producers or takes by consumers
42			static final int ITERS = 1 << 20;
43
44	jsr166	1.4	// max lag between a producer and consumer to avoid
45	dl	1.3	// this becoming a GC test rather than queue test.
46			// Used only per-pair to lessen impact on queue sync
47			static final int LAG_MASK = (1 << 12) - 1;
48
49	dl	1.1	public static void main(String[] args) throws Exception {
50	dl	1.3	int maxPairs = NCPUS * 3 / 2;
51	dl	1.1
52	jsr166	1.4	if (args.length > 0)
53	dl	1.1	maxPairs = Integer.parseInt(args[0]);
54
55	dl	1.3	warmup();
56	dl	1.1	print = true;
57	jsr166	1.8	for (int k = 1, i = 1; i <= maxPairs;) {
58	dl	1.1	System.out.println("Pairs:" + i);
59	dl	1.3	oneTest(i, ITERS);
60	dl	1.1	if (i == k) {
61			k = i << 1;
62			i = i + (i >>> 1);
63	jsr166	1.4	}
64			else
65	dl	1.1	i = k;
66			}
67			pool.shutdown();
68	dl	1.3	}
69	dl	1.1
70	dl	1.3	static void warmup() throws Exception {
71			print = false;
72			System.out.print("Warmup ");
73			int it = 2000;
74			for (int j = 5; j > 0; --j) {
75	jsr166	1.4	oneTest(j, it);
76	dl	1.3	System.out.print(".");
77			it += 1000;
78			}
79			System.gc();
80			it = 20000;
81			for (int j = 5; j > 0; --j) {
82	jsr166	1.4	oneTest(j, it);
83	dl	1.3	System.out.print(".");
84			it += 10000;
85			}
86			System.gc();
87			System.out.println();
88			}
89
90			static void oneTest(int n, int iters) throws Exception {
91			int fairIters = iters/16;
92
93			Thread.sleep(100); // System.gc();
94	dl	1.1	if (print)
95	dl	1.3	System.out.print("LinkedTransferQueue ");
96			oneRun(new LinkedTransferQueue<Integer>(), n, iters);
97	dl	1.1
98	dl	1.3	Thread.sleep(100); // System.gc();
99	dl	1.1	if (print)
100			System.out.print("LinkedBlockingQueue ");
101	dl	1.3	oneRun(new LinkedBlockingQueue<Integer>(), n, iters);
102
103			Thread.sleep(100); // System.gc();
104			if (print)
105			System.out.print("LinkedBlockingQueue(cap)");
106			oneRun(new LinkedBlockingQueue<Integer>(POOL_SIZE), n, iters);
107	dl	1.1
108	dl	1.3	Thread.sleep(100); // System.gc();
109	dl	1.1	if (print)
110			System.out.print("LinkedBlockingDeque ");
111	dl	1.3	oneRun(new LinkedBlockingDeque<Integer>(), n, iters);
112	jsr166	1.4
113	dl	1.3	Thread.sleep(100); // System.gc();
114			if (print)
115			System.out.print("ArrayBlockingQueue ");
116			oneRun(new ArrayBlockingQueue<Integer>(POOL_SIZE), n, iters);
117	dl	1.1
118	dl	1.3	Thread.sleep(100); // System.gc();
119	dl	1.1	if (print)
120			System.out.print("SynchronousQueue ");
121	dl	1.3	oneRun(new SynchronousQueue<Integer>(), n, iters);
122	dl	1.1
123	jsr166	1.4
124	dl	1.3	Thread.sleep(100); // System.gc();
125	dl	1.1	if (print)
126			System.out.print("SynchronousQueue(fair) ");
127	dl	1.3	oneRun(new SynchronousQueue<Integer>(true), n, iters);
128
129			Thread.sleep(100); // System.gc();
130			if (print)
131			System.out.print("LinkedTransferQueue(xfer)");
132			oneRun(new LTQasSQ<Integer>(), n, iters);
133	dl	1.1
134	dl	1.3	Thread.sleep(100); // System.gc();
135			if (print)
136			System.out.print("LinkedTransferQueue(half)");
137			oneRun(new HalfSyncLTQ<Integer>(), n, iters);
138	jsr166	1.4
139	dl	1.3	Thread.sleep(100); // System.gc();
140	dl	1.1	if (print)
141			System.out.print("PriorityBlockingQueue ");
142	dl	1.3	oneRun(new PriorityBlockingQueue<Integer>(), n, fairIters);
143	dl	1.1
144	dl	1.3	Thread.sleep(100); // System.gc();
145	dl	1.1	if (print)
146			System.out.print("ArrayBlockingQueue(fair)");
147	dl	1.3	oneRun(new ArrayBlockingQueue<Integer>(POOL_SIZE, true), n, fairIters);
148	dl	1.1
149			}
150	jsr166	1.4
151	jsr166	1.6	abstract static class Stage implements Runnable {
152	dl	1.1	final int iters;
153			final BlockingQueue<Integer> queue;
154			final CyclicBarrier barrier;
155	dl	1.3	final Phaser lagPhaser;
156	jsr166	1.5	Stage(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s, int iters) {
157	jsr166	1.4	queue = q;
158	dl	1.1	barrier = b;
159	dl	1.3	lagPhaser = s;
160	dl	1.1	this.iters = iters;
161			}
162			}
163
164			static class Producer extends Stage {
165	dl	1.3	Producer(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s,
166			int iters) {
167			super(q, b, s, iters);
168	dl	1.1	}
169
170			public void run() {
171			try {
172			barrier.await();
173	dl	1.3	int ps = 0;
174			int r = hashCode();
175	dl	1.1	for (int i = 0; i < iters; ++i) {
176	dl	1.3	r = LoopHelpers.compute7(r);
177			Integer v = intPool[r & POOL_MASK];
178			int k = v.intValue();
179			queue.put(v);
180			ps += k;
181			if ((i & LAG_MASK) == LAG_MASK)
182			lagPhaser.arriveAndAwaitAdvance();
183	dl	1.1	}
184	dl	1.3	addProducerSum(ps);
185	dl	1.1	barrier.await();
186			}
187	jsr166	1.4	catch (Exception ie) {
188			ie.printStackTrace();
189			return;
190	dl	1.1	}
191			}
192			}
193
194			static class Consumer extends Stage {
195	dl	1.3	Consumer(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s,
196	jsr166	1.4	int iters) {
197	dl	1.3	super(q, b, s, iters);
198	dl	1.1	}
199
200			public void run() {
201			try {
202			barrier.await();
203	dl	1.3	int cs = 0;
204	dl	1.1	for (int i = 0; i < iters; ++i) {
205	dl	1.3	Integer v = queue.take();
206			int k = v.intValue();
207			cs += k;
208			if ((i & LAG_MASK) == LAG_MASK)
209			lagPhaser.arriveAndAwaitAdvance();
210	dl	1.1	}
211	dl	1.3	addConsumerSum(cs);
212	dl	1.1	barrier.await();
213			}
214	jsr166	1.4	catch (Exception ie) {
215			ie.printStackTrace();
216			return;
217	dl	1.1	}
218			}
219
220			}
221
222	dl	1.3	static void oneRun(BlockingQueue<Integer> q, int n, int iters) throws Exception {
223	dl	1.1	LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
224	dl	1.3	CyclicBarrier barrier = new CyclicBarrier(n * 2 + 1, timer);
225			for (int i = 0; i < n; ++i) {
226			Phaser s = new Phaser(2);
227			pool.execute(new Producer(q, barrier, s, iters));
228			pool.execute(new Consumer(q, barrier, s, iters));
229	dl	1.1	}
230			barrier.await();
231			barrier.await();
232			long time = timer.getTime();
233			checkSum();
234			if (print)
235	dl	1.3	System.out.println("\t: " + LoopHelpers.rightJustify(time / (iters * n)) + " ns per transfer");
236			}
237
238			static final class LTQasSQ<T> extends LinkedTransferQueue<T> {
239			LTQasSQ() { super(); }
240			public void put(T x) {
241	jsr166	1.4	try { super.transfer(x);
242	dl	1.3	} catch (InterruptedException ex) { throw new Error(); }
243			}
244	dl	1.1	}
245
246	dl	1.3	static final class HalfSyncLTQ<T> extends LinkedTransferQueue<T> {
247			int calls;
248			HalfSyncLTQ() { super(); }
249			public void put(T x) {
250			if ((++calls & 1) == 0)
251			super.put(x);
252			else {
253	jsr166	1.4	try { super.transfer(x);
254			} catch (InterruptedException ex) {
255			throw new Error();
256	dl	1.3	}
257			}
258			}
259			}
260	dl	1.1	}