test/loops/ConcurrentQueueLoops.java

/*
 * @test %I% %E%
 * @bug 4486658
 * @compile -source 1.5 ConcurrentQueueLoops.java
 * @run main/timeout=230 ConcurrentQueueLoops
 * @summary Checks that a set of threads can repeatedly get and modify items
 */
/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain. Use, modify, and
 * redistribute this code in any way without acknowledgement.
 */

import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.*;

public class ConcurrentQueueLoops {
    static final ExecutorService pool = Executors.newCachedThreadPool();
    static AtomicInteger totalItems;
    static boolean print = false;

    public static void main(String[] args) throws Exception {
        int maxStages = 8;
        int items = 100000;

        Class klass = null;
        if (args.length > 0) {
            try {
                klass = Class.forName(args[0]);
            } catch(ClassNotFoundException e) {
                throw new RuntimeException("Class " + args[0] + " not found.");
            }
        }
        else 
            klass = java.util.concurrent.ConcurrentLinkedQueue.class;

        if (args.length > 1) 
            maxStages = Integer.parseInt(args[1]);

        System.out.print("Class: " + klass.getName());
        System.out.println(" stages: " + maxStages);

        print = false;
        System.out.println("Warmup...");
        oneRun(klass, 1, items);
        Thread.sleep(100);
        oneRun(klass, 1, items);
        Thread.sleep(100);
        print = true;

        for (int i = 1; i <= maxStages; i += (i+1) >>> 1) {
            oneRun(klass, i, items);
        }
        pool.shutdown();
   }

    static class Stage implements Callable<Integer> {
        final Queue<Integer> queue;
        final CyclicBarrier barrier;
        int items;
        Stage (Queue<Integer> q, CyclicBarrier b, int items) {
            queue = q; 
            barrier = b;
            this.items = items;
        }

        public Integer call() {
            // Repeatedly take something from queue if possible,
            // transform it, and put back in.
            try {
                barrier.await();
                int l = (int)System.nanoTime();
                int takes = 0;
                int seq = l;
                for (;;) {
                    Integer item = queue.poll();
                    if (item != null) {
                        ++takes;
                        l = LoopHelpers.compute2(item.intValue());
                    }
                    else if (takes != 0) {
                        totalItems.getAndAdd(-takes);
                        takes = 0;
                    }
                    else if (totalItems.get() <= 0)
                        break;
                    l = LoopHelpers.compute1(l);
                    if (items > 0) {
                        --items;
                        while (!queue.offer(new Integer(l^seq++))) ;
                    }
                    else if ( (l & (3 << 5)) == 0) // spinwait
                        Thread.sleep(1);
                }
                return new Integer(l);
            }
            catch (Exception ie) { 
                ie.printStackTrace();
                throw new Error("Call loop failed");
            }
        }
    }

    static void oneRun(Class klass, int n, int items) throws Exception {
        Queue<Integer> q = (Queue<Integer>)klass.newInstance();
        LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
        CyclicBarrier barrier = new CyclicBarrier(n + 1, timer);
        totalItems = new AtomicInteger(n * items);
        ArrayList<Future<Integer>> results = new ArrayList<Future<Integer>>(n);
        for (int i = 0; i < n; ++i) 
            results.add(pool.submit(new Stage(q, barrier, items)));

        if (print)
            System.out.print("Threads: " + n + "\t:");
        barrier.await();
        int total = 0;
        for (int i = 0; i < n; ++i) {
            Future<Integer> f = results.get(i);
            Integer r = f.get();
            total += r.intValue();
        }
        long endTime = System.nanoTime();
        long time = endTime - timer.startTime;
        if (print)
            System.out.println(LoopHelpers.rightJustify(time / (items * n)) + " ns per item");
        if (total == 0) // avoid overoptimization
            System.out.println("useless result: " + total);
        
    }
}
Revision:	1.1
Committed:	Mon May 2 19:19:38 2005 UTC (19 years ago) by dl
Branch:	MAIN
Log Message:	Put misc performance tests into CVS
#	User	Rev	Content
1	dl	1.1	/*
2			* @test %I% %E%
3			* @bug 4486658
4			* @compile -source 1.5 ConcurrentQueueLoops.java
5			* @run main/timeout=230 ConcurrentQueueLoops
6			* @summary Checks that a set of threads can repeatedly get and modify items
7			*/
8			/*
9			* Written by Doug Lea with assistance from members of JCP JSR-166
10			* Expert Group and released to the public domain. Use, modify, and
11			* redistribute this code in any way without acknowledgement.
12			*/
13
14			import java.util.*;
15			import java.util.concurrent.*;
16			import java.util.concurrent.atomic.*;
17
18			public class ConcurrentQueueLoops {
19			static final ExecutorService pool = Executors.newCachedThreadPool();
20			static AtomicInteger totalItems;
21			static boolean print = false;
22
23			public static void main(String[] args) throws Exception {
24			int maxStages = 8;
25			int items = 100000;
26
27			Class klass = null;
28			if (args.length > 0) {
29			try {
30			klass = Class.forName(args[0]);
31			} catch(ClassNotFoundException e) {
32			throw new RuntimeException("Class " + args[0] + " not found.");
33			}
34			}
35			else
36			klass = java.util.concurrent.ConcurrentLinkedQueue.class;
37
38			if (args.length > 1)
39			maxStages = Integer.parseInt(args[1]);
40
41			System.out.print("Class: " + klass.getName());
42			System.out.println(" stages: " + maxStages);
43
44			print = false;
45			System.out.println("Warmup...");
46			oneRun(klass, 1, items);
47			Thread.sleep(100);
48			oneRun(klass, 1, items);
49			Thread.sleep(100);
50			print = true;
51
52			for (int i = 1; i <= maxStages; i += (i+1) >>> 1) {
53			oneRun(klass, i, items);
54			}
55			pool.shutdown();
56			}
57
58			static class Stage implements Callable<Integer> {
59			final Queue<Integer> queue;
60			final CyclicBarrier barrier;
61			int items;
62			Stage (Queue<Integer> q, CyclicBarrier b, int items) {
63			queue = q;
64			barrier = b;
65			this.items = items;
66			}
67
68			public Integer call() {
69			// Repeatedly take something from queue if possible,
70			// transform it, and put back in.
71			try {
72			barrier.await();
73			int l = (int)System.nanoTime();
74			int takes = 0;
75			int seq = l;
76			for (;;) {
77			Integer item = queue.poll();
78			if (item != null) {
79			++takes;
80			l = LoopHelpers.compute2(item.intValue());
81			}
82			else if (takes != 0) {
83			totalItems.getAndAdd(-takes);
84			takes = 0;
85			}
86			else if (totalItems.get() <= 0)
87			break;
88			l = LoopHelpers.compute1(l);
89			if (items > 0) {
90			--items;
91			while (!queue.offer(new Integer(l^seq++))) ;
92			}
93			else if ( (l & (3 << 5)) == 0) // spinwait
94			Thread.sleep(1);
95			}
96			return new Integer(l);
97			}
98			catch (Exception ie) {
99			ie.printStackTrace();
100			throw new Error("Call loop failed");
101			}
102			}
103			}
104
105			static void oneRun(Class klass, int n, int items) throws Exception {
106			Queue<Integer> q = (Queue<Integer>)klass.newInstance();
107			LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
108			CyclicBarrier barrier = new CyclicBarrier(n + 1, timer);
109			totalItems = new AtomicInteger(n * items);
110			ArrayList<Future<Integer>> results = new ArrayList<Future<Integer>>(n);
111			for (int i = 0; i < n; ++i)
112			results.add(pool.submit(new Stage(q, barrier, items)));
113
114			if (print)
115			System.out.print("Threads: " + n + "\t:");
116			barrier.await();
117			int total = 0;
118			for (int i = 0; i < n; ++i) {
119			Future<Integer> f = results.get(i);
120			Integer r = f.get();
121			total += r.intValue();
122			}
123			long endTime = System.nanoTime();
124			long time = endTime - timer.startTime;
125			if (print)
126			System.out.println(LoopHelpers.rightJustify(time / (items * n)) + " ns per item");
127			if (total == 0) // avoid overoptimization
128			System.out.println("useless result: " + total);
129
130			}
131			}