test/loops/CancelledProducerConsumerLoops.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/licenses/publicdomain
 */
import java.util.concurrent.*;

public class CancelledProducerConsumerLoops {
    static final int CAPACITY =      100;
    static final long TIMEOUT = 100;

    static final ExecutorService pool = Executors.newCachedThreadPool();
    static boolean print = false;

    public static void main(String[] args) throws Exception {
        int maxPairs = 8;
        int iters = 1000000;

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

        print = true;

        for (int i = 1; i <= maxPairs; i += (i+1) >>> 1) {
            System.out.println("Pairs:" + i);
            try {
                oneTest(i, iters);
            }
            catch(BrokenBarrierException bb) {
                // OK, ignore
            }
            Thread.sleep(100);
        }
        pool.shutdown();
   }

    static void oneRun(BlockingQueue<Integer> q, int npairs, int iters) throws Exception {
        LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
        CyclicBarrier barrier = new CyclicBarrier(npairs * 2 + 1, timer);
        Future[] prods = new Future[npairs];
        Future[] cons = new Future[npairs];

        for (int i = 0; i < npairs; ++i) {
            prods[i] = pool.submit(new Producer(q, barrier, iters));
            cons[i] = pool.submit(new Consumer(q, barrier, iters));
        }
        barrier.await();
        Thread.sleep(TIMEOUT);
        boolean tooLate = false;

        for (int i = 1; i < npairs; ++i) {
            if (!prods[i].cancel(true))
                tooLate = true;
            if (!cons[i].cancel(true))
                tooLate = true;
        }

        Object p0 = prods[0].get();
        Object c0 = cons[0].get();

        if (!tooLate) {
            for (int i = 1; i < npairs; ++i) {
                if (!prods[i].isDone() || !prods[i].isCancelled())
                    throw new Error("Only one producer thread should complete");
                if (!cons[i].isDone() || !cons[i].isCancelled())
                    throw new Error("Only one consumer thread should complete");
            }
        }
        else
            System.out.print("(cancelled too late) ");

        long endTime = System.nanoTime();
        long time = endTime - timer.startTime;
        if (print) {
            double secs = (double)(time) / 1000000000.0;
            System.out.println("\t " + secs + "s run time");
        }
    }

    static void oneTest(int pairs, int iters) throws Exception {

        if (print)
            System.out.print("ArrayBlockingQueue      ");
        oneRun(new ArrayBlockingQueue<Integer>(CAPACITY), pairs, iters);

        if (print)
            System.out.print("LinkedBlockingQueue     ");
        oneRun(new LinkedBlockingQueue<Integer>(CAPACITY), pairs, iters);


        if (print)
            System.out.print("SynchronousQueue        ");
        oneRun(new SynchronousQueue<Integer>(), pairs, iters / 8);


        if (print)
            System.out.print("SynchronousQueue(fair)  ");
        oneRun(new SynchronousQueue<Integer>(true), pairs, iters / 8);

        /* Can legitimately run out of memory before cancellation
        if (print)
            System.out.print("PriorityBlockingQueue   ");
        oneRun(new PriorityBlockingQueue<Integer>(ITERS / 2 * pairs), pairs, iters / 4);
        */
    }

    static abstract class Stage implements Callable {
        final BlockingQueue<Integer> queue;
        final CyclicBarrier barrier;
        final int iters;
        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 Object call() throws Exception {
            barrier.await();
            int s = 0;
            int l = 4321;
            for (int i = 0; i < iters; ++i) {
                l = LoopHelpers.compute1(l);
                s += LoopHelpers.compute2(l);
                if (!queue.offer(new Integer(l), 1, TimeUnit.SECONDS))
                    break;
            }
            return new Integer(s);
        }
    }

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

        public Object call() throws Exception {
            barrier.await();
            int l = 0;
            int s = 0;
            for (int i = 0; i < iters; ++i) {
                Integer x = queue.poll(1, TimeUnit.SECONDS);
                if (x == null)
                    break;
                l = LoopHelpers.compute1(x.intValue());
                s += l;
            }
            return new Integer(s);
        }
    }


}
Revision:	1.5
Committed:	Thu Oct 29 23:09:07 2009 UTC (14 years, 6 months ago) by jsr166
Branch:	MAIN
Changes since 1.4:	+7 -7 lines
Log Message:	whitespace
#	User	Rev	Content
1	dl	1.1	/*
2			* Written by Doug Lea with assistance from members of JCP JSR-166
3	dl	1.4	* Expert Group and released to the public domain, as explained at
4			* http://creativecommons.org/licenses/publicdomain
5	dl	1.1	*/
6			import java.util.concurrent.*;
7
8			public class CancelledProducerConsumerLoops {
9			static final int CAPACITY = 100;
10	jsr166	1.5	static final long TIMEOUT = 100;
11	dl	1.1
12			static final ExecutorService pool = Executors.newCachedThreadPool();
13			static boolean print = false;
14
15			public static void main(String[] args) throws Exception {
16			int maxPairs = 8;
17			int iters = 1000000;
18
19	jsr166	1.5	if (args.length > 0)
20	dl	1.1	maxPairs = Integer.parseInt(args[0]);
21
22			print = true;
23	jsr166	1.5
24	dl	1.1	for (int i = 1; i <= maxPairs; i += (i+1) >>> 1) {
25			System.out.println("Pairs:" + i);
26			try {
27			oneTest(i, iters);
28			}
29			catch(BrokenBarrierException bb) {
30			// OK, ignore
31			}
32			Thread.sleep(100);
33			}
34			pool.shutdown();
35			}
36
37			static void oneRun(BlockingQueue<Integer> q, int npairs, int iters) throws Exception {
38			LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
39			CyclicBarrier barrier = new CyclicBarrier(npairs * 2 + 1, timer);
40			Future[] prods = new Future[npairs];
41			Future[] cons = new Future[npairs];
42	jsr166	1.5
43	dl	1.1	for (int i = 0; i < npairs; ++i) {
44			prods[i] = pool.submit(new Producer(q, barrier, iters));
45			cons[i] = pool.submit(new Consumer(q, barrier, iters));
46			}
47			barrier.await();
48			Thread.sleep(TIMEOUT);
49			boolean tooLate = false;
50
51			for (int i = 1; i < npairs; ++i) {
52			if (!prods[i].cancel(true))
53			tooLate = true;
54			if (!cons[i].cancel(true))
55			tooLate = true;
56			}
57
58			Object p0 = prods[0].get();
59			Object c0 = cons[0].get();
60
61			if (!tooLate) {
62			for (int i = 1; i < npairs; ++i) {
63			if (!prods[i].isDone() \|\| !prods[i].isCancelled())
64			throw new Error("Only one producer thread should complete");
65			if (!cons[i].isDone() \|\| !cons[i].isCancelled())
66			throw new Error("Only one consumer thread should complete");
67			}
68			}
69			else
70			System.out.print("(cancelled too late) ");
71
72			long endTime = System.nanoTime();
73			long time = endTime - timer.startTime;
74			if (print) {
75			double secs = (double)(time) / 1000000000.0;
76			System.out.println("\t " + secs + "s run time");
77			}
78			}
79
80			static void oneTest(int pairs, int iters) throws Exception {
81
82			if (print)
83			System.out.print("ArrayBlockingQueue ");
84			oneRun(new ArrayBlockingQueue<Integer>(CAPACITY), pairs, iters);
85
86			if (print)
87			System.out.print("LinkedBlockingQueue ");
88			oneRun(new LinkedBlockingQueue<Integer>(CAPACITY), pairs, iters);
89
90
91			if (print)
92			System.out.print("SynchronousQueue ");
93			oneRun(new SynchronousQueue<Integer>(), pairs, iters / 8);
94
95
96			if (print)
97			System.out.print("SynchronousQueue(fair) ");
98			oneRun(new SynchronousQueue<Integer>(true), pairs, iters / 8);
99
100	dl	1.3	/* Can legitimately run out of memory before cancellation
101	dl	1.1	if (print)
102			System.out.print("PriorityBlockingQueue ");
103			oneRun(new PriorityBlockingQueue<Integer>(ITERS / 2 * pairs), pairs, iters / 4);
104	dl	1.3	*/
105	dl	1.1	}
106	jsr166	1.5
107	dl	1.1	static abstract class Stage implements Callable {
108			final BlockingQueue<Integer> queue;
109			final CyclicBarrier barrier;
110			final int iters;
111			Stage (BlockingQueue<Integer> q, CyclicBarrier b, int iters) {
112	jsr166	1.5	queue = q;
113	dl	1.1	barrier = b;
114			this.iters = iters;
115			}
116			}
117
118			static class Producer extends Stage {
119			Producer(BlockingQueue<Integer> q, CyclicBarrier b, int iters) {
120			super(q, b, iters);
121			}
122
123			public Object call() throws Exception {
124			barrier.await();
125			int s = 0;
126			int l = 4321;
127			for (int i = 0; i < iters; ++i) {
128			l = LoopHelpers.compute1(l);
129			s += LoopHelpers.compute2(l);
130			if (!queue.offer(new Integer(l), 1, TimeUnit.SECONDS))
131			break;
132			}
133			return new Integer(s);
134			}
135			}
136
137			static class Consumer extends Stage {
138	jsr166	1.5	Consumer(BlockingQueue<Integer> q, CyclicBarrier b, int iters) {
139	dl	1.1	super(q, b, iters);
140			}
141
142			public Object call() throws Exception {
143			barrier.await();
144			int l = 0;
145			int s = 0;
146			for (int i = 0; i < iters; ++i) {
147			Integer x = queue.poll(1, TimeUnit.SECONDS);
148			if (x == null)
149			break;
150			l = LoopHelpers.compute1(x.intValue());
151			s += l;
152			}
153			return new Integer(s);
154			}
155			}
156
157
158			}