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/licenses/publicdomain
 */

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;
        int k = 1;
        for (int 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);


    }

    static abstract 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:	1.6
Committed:	Wed Sep 1 07:47:27 2010 UTC (13 years, 8 months ago) by jsr166
Branch:	MAIN
Changes since 1.5:	+2 -2 lines
Log Message:	whitespace
#	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/licenses/publicdomain
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	int k = 1;
58	for (int i = 1; i <= maxn;) {
59	System.out.println("Producers:" + i);
60	oneTest(i, ITERS);
61	if (i == k) {
62	k = i << 1;
63	i = i + (i >>> 1);
64	}
65	else
66	i = k;
67	}
68	pool.shutdown();
69	}
70
71	static void warmup() throws Exception {
72	print = false;
73	System.out.print("Warmup ");
74	int it = 2000;
75	for (int j = 5; j > 0; --j) {
76	oneTest(j, it);
77	System.out.print(".");
78	it += 1000;
79	}
80	System.gc();
81	it = 20000;
82	for (int j = 5; j > 0; --j) {
83	oneTest(j, it);
84	System.out.print(".");
85	it += 10000;
86	}
87	System.gc();
88	System.out.println();
89	}
90
91	static void oneTest(int n, int iters) throws Exception {
92	int fairIters = iters/16;
93
94	Thread.sleep(100); // System.gc();
95	if (print)
96	System.out.print("LinkedTransferQueue ");
97	oneRun(new LinkedTransferQueue<Integer>(), n, iters);
98
99	Thread.sleep(100); // System.gc();
100	if (print)
101	System.out.print("LinkedBlockingQueue ");
102	oneRun(new LinkedBlockingQueue<Integer>(), n, iters);
103
104	Thread.sleep(100); // System.gc();
105	if (print)
106	System.out.print("LinkedBlockingQueue(cap)");
107	oneRun(new LinkedBlockingQueue<Integer>(POOL_SIZE), n, iters);
108
109	Thread.sleep(100); // System.gc();
110	if (print)
111	System.out.print("LinkedBlockingDeque ");
112	oneRun(new LinkedBlockingDeque<Integer>(), n, iters);
113
114	Thread.sleep(100); // System.gc();
115	if (print)
116	System.out.print("ArrayBlockingQueue ");
117	oneRun(new ArrayBlockingQueue<Integer>(POOL_SIZE), n, iters);
118
119	Thread.sleep(100); // System.gc();
120	if (print)
121	System.out.print("SynchronousQueue ");
122	oneRun(new SynchronousQueue<Integer>(), n, iters);
123
124
125	Thread.sleep(100); // System.gc();
126	if (print)
127	System.out.print("SynchronousQueue(fair) ");
128	oneRun(new SynchronousQueue<Integer>(true), n, iters);
129
130	Thread.sleep(100); // System.gc();
131	if (print)
132	System.out.print("LinkedTransferQueue(xfer)");
133	oneRun(new LTQasSQ<Integer>(), n, iters);
134
135	Thread.sleep(100); // System.gc();
136	if (print)
137	System.out.print("LinkedTransferQueue(half)");
138	oneRun(new HalfSyncLTQ<Integer>(), n, iters);
139
140	Thread.sleep(100); // System.gc();
141	if (print)
142	System.out.print("PriorityBlockingQueue ");
143	oneRun(new PriorityBlockingQueue<Integer>(), n, fairIters);
144
145	Thread.sleep(100); // System.gc();
146	if (print)
147	System.out.print("ArrayBlockingQueue(fair)");
148	oneRun(new ArrayBlockingQueue<Integer>(POOL_SIZE, true), n, fairIters);
149
150
151	}
152
153	static abstract class Stage implements Runnable {
154	final int iters;
155	final BlockingQueue<Integer> queue;
156	final CyclicBarrier barrier;
157	final Phaser lagPhaser;
158	final int lag;
159	Stage(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s,
160	int iters, int lag) {
161	queue = q;
162	barrier = b;
163	lagPhaser = s;
164	this.iters = iters;
165	this.lag = lag;
166	}
167	}
168
169	static class Producer extends Stage {
170	Producer(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s,
171	int iters, int lag) {
172	super(q, b, s, iters, lag);
173	}
174
175	public void run() {
176	try {
177	barrier.await();
178	int ps = 0;
179	int r = hashCode();
180	int j = 0;
181	for (int i = 0; i < iters; ++i) {
182	r = LoopHelpers.compute7(r);
183	Integer v = intPool[r & POOL_MASK];
184	int k = v.intValue();
185	queue.put(v);
186	ps += k;
187	if (++j == lag) {
188	j = 0;
189	lagPhaser.arriveAndAwaitAdvance();
190	}
191	}
192	addProducerSum(ps);
193	barrier.await();
194	}
195	catch (Exception ie) {
196	ie.printStackTrace();
197	return;
198	}
199	}
200	}
201
202	static class Consumer extends Stage {
203	Consumer(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s,
204	int iters, int lag) {
205	super(q, b, s, iters, lag);
206	}
207
208	public void run() {
209	try {
210	barrier.await();
211	int cs = 0;
212	int j = 0;
213	for (int i = 0; i < iters; ++i) {
214	Integer v = queue.take();
215	int k = v.intValue();
216	cs += k;
217	if (++j == lag) {
218	j = 0;
219	lagPhaser.arriveAndAwaitAdvance();
220	}
221	}
222	addConsumerSum(cs);
223	barrier.await();
224	}
225	catch (Exception ie) {
226	ie.printStackTrace();
227	return;
228	}
229	}
230
231	}
232
233
234	static void oneRun(BlockingQueue<Integer> q, int n, int iters) throws Exception {
235
236	LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
237	CyclicBarrier barrier = new CyclicBarrier(n + 2, timer);
238	Phaser s = new Phaser(n + 1);
239	for (int i = 0; i < n; ++i) {
240	pool.execute(new Producer(q, barrier, s, iters, LAG));
241	}
242	pool.execute(new Consumer(q, barrier, s, iters * n, LAG * n));
243	barrier.await();
244	barrier.await();
245	long time = timer.getTime();
246	checkSum();
247	if (print)
248	System.out.println("\t: " + LoopHelpers.rightJustify(time / (iters * (n + 1))) + " ns per transfer");
249	}
250
251	static final class LTQasSQ<T> extends LinkedTransferQueue<T> {
252	LTQasSQ() { super(); }
253	public void put(T x) {
254	try { super.transfer(x);
255	} catch (InterruptedException ex) { throw new Error(); }
256	}
257	}
258
259	static final class HalfSyncLTQ<T> extends LinkedTransferQueue<T> {
260	int calls;
261	HalfSyncLTQ() { super(); }
262	public void put(T x) {
263	if ((++calls & 1) == 0)
264	super.put(x);
265	else {
266	try { super.transfer(x);
267	} catch (InterruptedException ex) {
268	throw new Error();
269	}
270	}
271	}
272	}
273	}