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.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.LinkedTransferQueue;
import java.util.concurrent.Phaser;
import java.util.concurrent.PriorityBlockingQueue;
import java.util.concurrent.SynchronousQueue;

public class MultipleProducersSingleConsumerLoops {
    static final int NCPUS = Runtime.getRuntime().availableProcessors();
    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(ex); }
        }
    }

    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(ex); }
            }
        }
    }
}
Revision:	1.15
Committed:	Sat Dec 31 21:34:47 2016 UTC (7 years, 3 months ago) by jsr166
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.14:	+4 -6 lines
Log Message:	better error handling
#	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.concurrent.ArrayBlockingQueue;
8	import java.util.concurrent.BlockingQueue;
9	import java.util.concurrent.CyclicBarrier;
10	import java.util.concurrent.ExecutorService;
11	import java.util.concurrent.Executors;
12	import java.util.concurrent.LinkedBlockingDeque;
13	import java.util.concurrent.LinkedBlockingQueue;
14	import java.util.concurrent.LinkedTransferQueue;
15	import java.util.concurrent.Phaser;
16	import java.util.concurrent.PriorityBlockingQueue;
17	import java.util.concurrent.SynchronousQueue;
18
19	public class MultipleProducersSingleConsumerLoops {
20	static final int NCPUS = Runtime.getRuntime().availableProcessors();
21	static final ExecutorService pool = Executors.newCachedThreadPool();
22	static boolean print = false;
23	static int producerSum;
24	static int consumerSum;
25	static synchronized void addProducerSum(int x) {
26	producerSum += x;
27	}
28
29	static synchronized void addConsumerSum(int x) {
30	consumerSum += x;
31	}
32
33	static synchronized void checkSum() {
34	if (producerSum != consumerSum)
35	throw new Error("CheckSum mismatch");
36	}
37
38	// Number of elements passed around -- must be power of two
39	// Elements are reused from pool to minimize alloc impact
40	static final int POOL_SIZE = 1 << 8;
41	static final int POOL_MASK = POOL_SIZE-1;
42	static final Integer[] intPool = new Integer[POOL_SIZE];
43	static {
44	for (int i = 0; i < POOL_SIZE; ++i)
45	intPool[i] = Integer.valueOf(i);
46	}
47
48	// Number of puts by producers or takes by consumers
49	static final int ITERS = 1 << 20;
50
51	// max lag between a producer and consumer to avoid
52	// this becoming a GC test rather than queue test.
53	static final int LAG = (1 << 12);
54	static final int LAG_MASK = LAG - 1;
55
56	public static void main(String[] args) throws Exception {
57	int maxn = 12; // NCPUS * 3 / 2;
58
59	if (args.length > 0)
60	maxn = Integer.parseInt(args[0]);
61
62	warmup();
63	print = true;
64	for (int k = 1, i = 1; i <= maxn;) {
65	System.out.println("Producers:" + i);
66	oneTest(i, ITERS);
67	if (i == k) {
68	k = i << 1;
69	i = i + (i >>> 1);
70	}
71	else
72	i = k;
73	}
74	pool.shutdown();
75	}
76
77	static void warmup() throws Exception {
78	print = false;
79	System.out.print("Warmup ");
80	int it = 2000;
81	for (int j = 5; j > 0; --j) {
82	oneTest(j, it);
83	System.out.print(".");
84	it += 1000;
85	}
86	System.gc();
87	it = 20000;
88	for (int j = 5; j > 0; --j) {
89	oneTest(j, it);
90	System.out.print(".");
91	it += 10000;
92	}
93	System.gc();
94	System.out.println();
95	}
96
97	static void oneTest(int n, int iters) throws Exception {
98	int fairIters = iters/16;
99
100	Thread.sleep(100); // System.gc();
101	if (print)
102	System.out.print("LinkedTransferQueue ");
103	oneRun(new LinkedTransferQueue<Integer>(), n, iters);
104
105	Thread.sleep(100); // System.gc();
106	if (print)
107	System.out.print("LinkedBlockingQueue ");
108	oneRun(new LinkedBlockingQueue<Integer>(), n, iters);
109
110	Thread.sleep(100); // System.gc();
111	if (print)
112	System.out.print("LinkedBlockingQueue(cap)");
113	oneRun(new LinkedBlockingQueue<Integer>(POOL_SIZE), n, iters);
114
115	Thread.sleep(100); // System.gc();
116	if (print)
117	System.out.print("LinkedBlockingDeque ");
118	oneRun(new LinkedBlockingDeque<Integer>(), n, iters);
119
120	Thread.sleep(100); // System.gc();
121	if (print)
122	System.out.print("ArrayBlockingQueue ");
123	oneRun(new ArrayBlockingQueue<Integer>(POOL_SIZE), n, iters);
124
125	Thread.sleep(100); // System.gc();
126	if (print)
127	System.out.print("SynchronousQueue ");
128	oneRun(new SynchronousQueue<Integer>(), n, iters);
129
130	Thread.sleep(100); // System.gc();
131	if (print)
132	System.out.print("SynchronousQueue(fair) ");
133	oneRun(new SynchronousQueue<Integer>(true), n, iters);
134
135	Thread.sleep(100); // System.gc();
136	if (print)
137	System.out.print("LinkedTransferQueue(xfer)");
138	oneRun(new LTQasSQ<Integer>(), n, iters);
139
140	Thread.sleep(100); // System.gc();
141	if (print)
142	System.out.print("LinkedTransferQueue(half)");
143	oneRun(new HalfSyncLTQ<Integer>(), n, iters);
144
145	Thread.sleep(100); // System.gc();
146	if (print)
147	System.out.print("PriorityBlockingQueue ");
148	oneRun(new PriorityBlockingQueue<Integer>(), n, fairIters);
149
150	Thread.sleep(100); // System.gc();
151	if (print)
152	System.out.print("ArrayBlockingQueue(fair)");
153	oneRun(new ArrayBlockingQueue<Integer>(POOL_SIZE, true), n, fairIters);
154	}
155
156	abstract static class Stage implements Runnable {
157	final int iters;
158	final BlockingQueue<Integer> queue;
159	final CyclicBarrier barrier;
160	final Phaser lagPhaser;
161	final int lag;
162	Stage(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s,
163	int iters, int lag) {
164	queue = q;
165	barrier = b;
166	lagPhaser = s;
167	this.iters = iters;
168	this.lag = lag;
169	}
170	}
171
172	static class Producer extends Stage {
173	Producer(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s,
174	int iters, int lag) {
175	super(q, b, s, iters, lag);
176	}
177
178	public void run() {
179	try {
180	barrier.await();
181	int ps = 0;
182	int r = hashCode();
183	int j = 0;
184	for (int i = 0; i < iters; ++i) {
185	r = LoopHelpers.compute7(r);
186	Integer v = intPool[r & POOL_MASK];
187	int k = v.intValue();
188	queue.put(v);
189	ps += k;
190	if (++j == lag) {
191	j = 0;
192	lagPhaser.arriveAndAwaitAdvance();
193	}
194	}
195	addProducerSum(ps);
196	barrier.await();
197	}
198	catch (Exception ie) {
199	ie.printStackTrace();
200	return;
201	}
202	}
203	}
204
205	static class Consumer extends Stage {
206	Consumer(BlockingQueue<Integer> q, CyclicBarrier b, Phaser s,
207	int iters, int lag) {
208	super(q, b, s, iters, lag);
209	}
210
211	public void run() {
212	try {
213	barrier.await();
214	int cs = 0;
215	int j = 0;
216	for (int i = 0; i < iters; ++i) {
217	Integer v = queue.take();
218	int k = v.intValue();
219	cs += k;
220	if (++j == lag) {
221	j = 0;
222	lagPhaser.arriveAndAwaitAdvance();
223	}
224	}
225	addConsumerSum(cs);
226	barrier.await();
227	}
228	catch (Exception ie) {
229	ie.printStackTrace();
230	return;
231	}
232	}
233
234	}
235
236	static void oneRun(BlockingQueue<Integer> q, int n, int iters) throws Exception {
237
238	LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
239	CyclicBarrier barrier = new CyclicBarrier(n + 2, timer);
240	Phaser s = new Phaser(n + 1);
241	for (int i = 0; i < n; ++i) {
242	pool.execute(new Producer(q, barrier, s, iters, LAG));
243	}
244	pool.execute(new Consumer(q, barrier, s, iters * n, LAG * n));
245	barrier.await();
246	barrier.await();
247	long time = timer.getTime();
248	checkSum();
249	if (print)
250	System.out.println("\t: " + LoopHelpers.rightJustify(time / (iters * (n + 1))) + " ns per transfer");
251	}
252
253	static final class LTQasSQ<T> extends LinkedTransferQueue<T> {
254	LTQasSQ() { super(); }
255	public void put(T x) {
256	try { super.transfer(x); }
257	catch (InterruptedException ex) { throw new Error(ex); }
258	}
259	}
260
261	static final class HalfSyncLTQ<T> extends LinkedTransferQueue<T> {
262	int calls;
263	HalfSyncLTQ() { super(); }
264	public void put(T x) {
265	if ((++calls & 1) == 0)
266	super.put(x);
267	else {
268	try { super.transfer(x); }
269	catch (InterruptedException ex) { throw new Error(ex); }
270	}
271	}
272	}
273	}