test/loops/MultipleProducersSingleConsumerLoops.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 MultipleProducersSingleConsumerLoops {
    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 << 8;
    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.
    static final int LAG = (1 << 12);
    static final int LAG_MASK = LAG - 1;

    public static void main(String[] args) throws Exception {
        int maxn = 12; // NCPUS * 3 / 2;

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

        warmup();
        print = true;
        for (int k = 1, i = 1; i <= maxn;) {
            System.out.println("Producers:" + 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;
        final int lag;
        Stage(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s,
              int iters, int lag) {
            queue = q;
            barrier = b;
            lagPhaser = s;
            this.iters = iters;
            this.lag = lag;
        }
    }

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

        public void run() {
            try {
                barrier.await();
                int ps = 0;
                int r = hashCode();
                int j = 0;
                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 (++j == lag) {
                        j = 0;
                        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, int lag) {
            super(q, b, s, iters, lag);
        }

        public void run() {
            try {
                barrier.await();
                int cs = 0;
                int j = 0;
                for (int i = 0; i < iters; ++i) {
                    Integer v = queue.take();
                    int k = v.intValue();
                    cs += k;
                    if (++j == lag) {
                        j = 0;
                        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, timer);
        Phaser s = new Phaser(n + 1);
        for (int i = 0; i < n; ++i) {
            pool.execute(new Producer(q, barrier, s, iters, LAG));
        }
        pool.execute(new Consumer(q, barrier, s, iters * n, LAG * n));
        barrier.await();
        barrier.await();
        long time = timer.getTime();
        checkSum();
        if (print)
            System.out.println("\t: " + LoopHelpers.rightJustify(time / (iters * (n + 1))) + " 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:	1.9
Committed:	Thu Dec 18 18:13:06 2014 UTC (9 years, 4 months ago) by jsr166
Branch:	MAIN
Changes since 1.8:	+1 -2 lines
Log Message:	move k = 1 into loop initializer
#	Content
1	/*
2	* Written by Doug Lea with assistance from members of JCP JSR-166
3	* Expert Group and released to the public domain, as explained at
4	* http://creativecommons.org/publicdomain/zero/1.0/
5	*/
6
7	import java.util.*;
8	import java.util.concurrent.*;
9	//import jsr166y.*;
10
11	public class MultipleProducersSingleConsumerLoops {
12	static final int NCPUS = Runtime.getRuntime().availableProcessors();
13	static final Random rng = new Random();
14	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	// 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 << 8;
34	static final int POOL_MASK = POOL_SIZE-1;
35	static final Integer[] intPool = new Integer[POOL_SIZE];
36	static {
37	for (int i = 0; i < POOL_SIZE; ++i)
38	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	// max lag between a producer and consumer to avoid
45	// this becoming a GC test rather than queue test.
46	static final int LAG = (1 << 12);
47	static final int LAG_MASK = LAG - 1;
48
49	public static void main(String[] args) throws Exception {
50	int maxn = 12; // NCPUS * 3 / 2;
51
52	if (args.length > 0)
53	maxn = Integer.parseInt(args[0]);
54
55	warmup();
56	print = true;
57	for (int k = 1, i = 1; i <= maxn;) {
58	System.out.println("Producers:" + i);
59	oneTest(i, ITERS);
60	if (i == k) {
61	k = i << 1;
62	i = i + (i >>> 1);
63	}
64	else
65	i = k;
66	}
67	pool.shutdown();
68	}
69
70	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	oneTest(j, it);
76	System.out.print(".");
77	it += 1000;
78	}
79	System.gc();
80	it = 20000;
81	for (int j = 5; j > 0; --j) {
82	oneTest(j, it);
83	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	if (print)
95	System.out.print("LinkedTransferQueue ");
96	oneRun(new LinkedTransferQueue<Integer>(), n, iters);
97
98	Thread.sleep(100); // System.gc();
99	if (print)
100	System.out.print("LinkedBlockingQueue ");
101	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
108	Thread.sleep(100); // System.gc();
109	if (print)
110	System.out.print("LinkedBlockingDeque ");
111	oneRun(new LinkedBlockingDeque<Integer>(), n, iters);
112
113	Thread.sleep(100); // System.gc();
114	if (print)
115	System.out.print("ArrayBlockingQueue ");
116	oneRun(new ArrayBlockingQueue<Integer>(POOL_SIZE), n, iters);
117
118	Thread.sleep(100); // System.gc();
119	if (print)
120	System.out.print("SynchronousQueue ");
121	oneRun(new SynchronousQueue<Integer>(), n, iters);
122
123
124	Thread.sleep(100); // System.gc();
125	if (print)
126	System.out.print("SynchronousQueue(fair) ");
127	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
134	Thread.sleep(100); // System.gc();
135	if (print)
136	System.out.print("LinkedTransferQueue(half)");
137	oneRun(new HalfSyncLTQ<Integer>(), n, iters);
138
139	Thread.sleep(100); // System.gc();
140	if (print)
141	System.out.print("PriorityBlockingQueue ");
142	oneRun(new PriorityBlockingQueue<Integer>(), n, fairIters);
143
144	Thread.sleep(100); // System.gc();
145	if (print)
146	System.out.print("ArrayBlockingQueue(fair)");
147	oneRun(new ArrayBlockingQueue<Integer>(POOL_SIZE, true), n, fairIters);
148
149
150	}
151
152	abstract static class Stage implements Runnable {
153	final int iters;
154	final BlockingQueue<Integer> queue;
155	final CyclicBarrier barrier;
156	final Phaser lagPhaser;
157	final int lag;
158	Stage(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s,
159	int iters, int lag) {
160	queue = q;
161	barrier = b;
162	lagPhaser = s;
163	this.iters = iters;
164	this.lag = lag;
165	}
166	}
167
168	static class Producer extends Stage {
169	Producer(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s,
170	int iters, int lag) {
171	super(q, b, s, iters, lag);
172	}
173
174	public void run() {
175	try {
176	barrier.await();
177	int ps = 0;
178	int r = hashCode();
179	int j = 0;
180	for (int i = 0; i < iters; ++i) {
181	r = LoopHelpers.compute7(r);
182	Integer v = intPool[r & POOL_MASK];
183	int k = v.intValue();
184	queue.put(v);
185	ps += k;
186	if (++j == lag) {
187	j = 0;
188	lagPhaser.arriveAndAwaitAdvance();
189	}
190	}
191	addProducerSum(ps);
192	barrier.await();
193	}
194	catch (Exception ie) {
195	ie.printStackTrace();
196	return;
197	}
198	}
199	}
200
201	static class Consumer extends Stage {
202	Consumer(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s,
203	int iters, int lag) {
204	super(q, b, s, iters, lag);
205	}
206
207	public void run() {
208	try {
209	barrier.await();
210	int cs = 0;
211	int j = 0;
212	for (int i = 0; i < iters; ++i) {
213	Integer v = queue.take();
214	int k = v.intValue();
215	cs += k;
216	if (++j == lag) {
217	j = 0;
218	lagPhaser.arriveAndAwaitAdvance();
219	}
220	}
221	addConsumerSum(cs);
222	barrier.await();
223	}
224	catch (Exception ie) {
225	ie.printStackTrace();
226	return;
227	}
228	}
229
230	}
231
232
233	static void oneRun(BlockingQueue<Integer> q, int n, int iters) throws Exception {
234
235	LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
236	CyclicBarrier barrier = new CyclicBarrier(n + 2, timer);
237	Phaser s = new Phaser(n + 1);
238	for (int i = 0; i < n; ++i) {
239	pool.execute(new Producer(q, barrier, s, iters, LAG));
240	}
241	pool.execute(new Consumer(q, barrier, s, iters * n, LAG * n));
242	barrier.await();
243	barrier.await();
244	long time = timer.getTime();
245	checkSum();
246	if (print)
247	System.out.println("\t: " + LoopHelpers.rightJustify(time / (iters * (n + 1))) + " ns per transfer");
248	}
249
250	static final class LTQasSQ<T> extends LinkedTransferQueue<T> {
251	LTQasSQ() { super(); }
252	public void put(T x) {
253	try { super.transfer(x);
254	} catch (InterruptedException ex) { throw new Error(); }
255	}
256	}
257
258	static final class HalfSyncLTQ<T> extends LinkedTransferQueue<T> {
259	int calls;
260	HalfSyncLTQ() { super(); }
261	public void put(T x) {
262	if ((++calls & 1) == 0)
263	super.put(x);
264	else {
265	try { super.transfer(x);
266	} catch (InterruptedException ex) {
267	throw new Error();
268	}
269	}
270	}
271	}
272	}