test/loops/ExecutorCompletionServiceLoops.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.*;

public class ExecutorCompletionServiceLoops {
    static final int POOLSIZE =      100;
    static final ExecutorService pool =
        Executors.newFixedThreadPool(POOLSIZE);
    static final ExecutorCompletionService<Integer> ecs =
        new ExecutorCompletionService<Integer>(pool);
    static boolean print = false;

    public static void main(String[] args) throws Exception {
        int max = 8;
        int base = 10000;

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

        System.out.println("Warmup...");
        oneTest( base );
        Thread.sleep(100);
        print = true;

        for (int i = 1; i <= max; i += (i+1) >>> 1) {
            System.out.print("n: " + i * base);
            oneTest(i * base );
            Thread.sleep(100);
        }
        pool.shutdown();
    }

    static class Task implements Callable<Integer> {
        public Integer call() {
            int l = System.identityHashCode(this);
            l = LoopHelpers.compute2(l);
            int s = LoopHelpers.compute1(l);
            l = LoopHelpers.compute2(l);
            s += LoopHelpers.compute1(l);
            return new Integer(s);
        }
    }

    static class Producer implements Runnable {
        final ExecutorCompletionService cs;
        final int iters;
        Producer(ExecutorCompletionService ecs, int i) {
            cs = ecs;
            iters = i;
        }
        public void run() {
            for (int i = 0; i < iters; ++i)
                ecs.submit(new Task());
        }
    }

    static void oneTest(int iters) throws Exception {
        long startTime = System.nanoTime();
        new Thread(new Producer(ecs, iters)).start();

        int r = 0;
        for (int i = 0; i < iters; ++i)
            r += ecs.take().get().intValue();

        long elapsed = System.nanoTime() - startTime;
        long tpi = elapsed/ iters;

        if (print)
            System.out.println("\t: " + LoopHelpers.rightJustify(tpi) + " ns per task");

        if (r == 0) // avoid overoptimization
            System.out.println("useless result: " + r);


    }

}
Revision:	1.5
Committed:	Thu Apr 14 23:16:10 2011 UTC (13 years ago) by jsr166
Branch:	MAIN
CVS Tags:	release-1_7_0
Changes since 1.4:	+1 -1 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	1.2	* Expert Group and released to the public domain, as explained at
4	jsr166	1.4	* http://creativecommons.org/publicdomain/zero/1.0/
5	dl	1.1	*/
6
7			import java.util.concurrent.*;
8
9			public class ExecutorCompletionServiceLoops {
10			static final int POOLSIZE = 100;
11	jsr166	1.3	static final ExecutorService pool =
12	dl	1.1	Executors.newFixedThreadPool(POOLSIZE);
13	jsr166	1.3	static final ExecutorCompletionService<Integer> ecs =
14	dl	1.1	new ExecutorCompletionService<Integer>(pool);
15			static boolean print = false;
16
17			public static void main(String[] args) throws Exception {
18			int max = 8;
19			int base = 10000;
20
21	jsr166	1.3	if (args.length > 0)
22	dl	1.1	max = Integer.parseInt(args[0]);
23
24			System.out.println("Warmup...");
25			oneTest( base );
26			Thread.sleep(100);
27			print = true;
28	jsr166	1.3
29	dl	1.1	for (int i = 1; i <= max; i += (i+1) >>> 1) {
30			System.out.print("n: " + i * base);
31			oneTest(i * base );
32			Thread.sleep(100);
33			}
34			pool.shutdown();
35	jsr166	1.5	}
36	jsr166	1.3
37	dl	1.1	static class Task implements Callable<Integer> {
38			public Integer call() {
39			int l = System.identityHashCode(this);
40			l = LoopHelpers.compute2(l);
41			int s = LoopHelpers.compute1(l);
42			l = LoopHelpers.compute2(l);
43			s += LoopHelpers.compute1(l);
44			return new Integer(s);
45			}
46			}
47
48			static class Producer implements Runnable {
49			final ExecutorCompletionService cs;
50			final int iters;
51	jsr166	1.3	Producer(ExecutorCompletionService ecs, int i) {
52	dl	1.1	cs = ecs;
53	jsr166	1.3	iters = i;
54	dl	1.1	}
55			public void run() {
56			for (int i = 0; i < iters; ++i)
57			ecs.submit(new Task());
58			}
59			}
60
61			static void oneTest(int iters) throws Exception {
62			long startTime = System.nanoTime();
63			new Thread(new Producer(ecs, iters)).start();
64
65			int r = 0;
66			for (int i = 0; i < iters; ++i)
67			r += ecs.take().get().intValue();
68
69			long elapsed = System.nanoTime() - startTime;
70			long tpi = elapsed/ iters;
71
72			if (print)
73			System.out.println("\t: " + LoopHelpers.rightJustify(tpi) + " ns per task");
74
75			if (r == 0) // avoid overoptimization
76			System.out.println("useless result: " + r);
77
78
79			}
80
81			}