test/loops/CachedThreadPoolLoops.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 jsr166y.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.*;

public class CachedThreadPoolLoops {
    static final int NCPUS = Runtime.getRuntime().availableProcessors();
    static final AtomicInteger remaining = new AtomicInteger();
    static final int maxIters = 1000000;

    public static void main(String[] args) throws Exception {
        int maxThreads = NCPUS * 3 / 2; // 100;
        if (args.length > 0) 
            maxThreads = Integer.parseInt(args[0]);

        System.out.print("Warmup:");
        for (int j = 0; j < 1; ++j) {
            int k = 1;
            for (int i = 1; i <= maxThreads;) {
                System.out.print(" " + i);
                oneTest(i, 10000, false);
                Thread.sleep(100);
                if (i == k) {
                    k = i << 1;
                    i = i + (i >>> 1);
                } 
                else 
                    i = k;
            }
        }
        System.out.println();

        int k = 1;
        for (int i = 1; i <= maxThreads;) {
            System.out.println("Threads:" + i);
            oneTest(i, maxIters, true);
            Thread.sleep(100);
            if (i == k) {
                k = i << 1;
                i = i + (i >>> 1);
            } 
            else 
                i = k;
        }
   }

    static void oneTest(int nThreads, int iters, boolean print) throws Exception {
        Thread.sleep(100); // System.gc();
        if (print) System.out.print("LinkedTransferQueue      ");
        oneRun(new LinkedTransferQueue<Runnable>(), nThreads, iters, print);

        Thread.sleep(100); // System.gc();
        if (print) System.out.print("LinkedBlockingQueue      ");
        oneRun(new LinkedBlockingQueue<Runnable>(), nThreads, iters, print);

        Thread.sleep(100); // System.gc();
        if (print) System.out.print("SynchronousQueue         ");
        oneRun(new SynchronousQueue<Runnable>(false), nThreads, iters, print);

        Thread.sleep(100); // System.gc();
        if (print) System.out.print("SynchronousQueue(fair)   ");
        oneRun(new SynchronousQueue<Runnable>(true), nThreads, iters, print);

        Thread.sleep(100); // System.gc();
        if (print) System.out.print("LinkedTransferQueue(xfer)");
        oneRun(new LTQasSQ<Runnable>(), nThreads, iters, print);

        Thread.sleep(100); // System.gc();
        if (print) System.out.print("LinkedTransferQueue(half)");
        oneRun(new HalfSyncLTQ<Runnable>(), nThreads, iters, print);

        Thread.sleep(100); // System.gc();
        if (print) System.out.print("ArrayBlockingQueue(256) ");
        oneRun(new ArrayBlockingQueue<Runnable>(256), nThreads, iters, print);

    }

    static final class Task implements Runnable {
        final ThreadPoolExecutor pool;
        final CountDownLatch done;
        Task(ThreadPoolExecutor p, CountDownLatch d) { 
            pool = p; 
            done = d;
        }
        public void run() {
            done.countDown();
            remaining.incrementAndGet();
            int n;
            while (!Thread.interrupted() &&
                   (n = remaining.get()) > 0 && 
                   done.getCount() > 0) {
                if (remaining.compareAndSet(n, n-1)) {
                    try {
                        pool.execute(this);
                    }
                    catch (RuntimeException ex) {
                        System.out.print("*");
                        while (done.getCount() > 0) done.countDown();
                        return;
                    }
                }
            }
        }
    }
    
    static void oneRun(BlockingQueue<Runnable> q, int nThreads, int iters, boolean print) throws Exception {
       
        ThreadPoolExecutor pool = 
            new ThreadPoolExecutor(nThreads+1, Integer.MAX_VALUE,
                                   1L, TimeUnit.SECONDS, q);

        CountDownLatch done = new CountDownLatch(iters);
        remaining.set(nThreads-1);
        pool.prestartAllCoreThreads();
        Task t = new Task(pool, done);
        long start = System.nanoTime();
        pool.execute(t);
        done.await();
        long time = System.nanoTime() - start;
        if (print)
            System.out.println("\t: " + LoopHelpers.rightJustify(time / iters) + " ns per task");
        q.clear();
        Thread.sleep(100);
        pool.shutdown();
        Thread.sleep(100);
        pool.shutdownNow();
    }

    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:	1.4
Committed:	Fri Oct 23 19:57:06 2009 UTC (14 years, 6 months ago) by dl
Branch:	MAIN
Changes since 1.3:	+53 -9 lines
Log Message:	Update misc tests for JDK7
#	User	Rev	Content
1	dl	1.1	/*
2			* Written by Doug Lea with assistance from members of JCP JSR-166
3	dl	1.3	* Expert Group and released to the public domain, as explained at
4			* http://creativecommons.org/licenses/publicdomain
5	dl	1.1	*/
6
7	dl	1.4	//import jsr166y.*;
8	dl	1.1	import java.util.concurrent.*;
9			import java.util.concurrent.atomic.*;
10
11			public class CachedThreadPoolLoops {
12	dl	1.4	static final int NCPUS = Runtime.getRuntime().availableProcessors();
13	dl	1.1	static final AtomicInteger remaining = new AtomicInteger();
14			static final int maxIters = 1000000;
15
16			public static void main(String[] args) throws Exception {
17	dl	1.4	int maxThreads = NCPUS * 3 / 2; // 100;
18	dl	1.1	if (args.length > 0)
19			maxThreads = Integer.parseInt(args[0]);
20	dl	1.2
21			System.out.print("Warmup:");
22	dl	1.4	for (int j = 0; j < 1; ++j) {
23	dl	1.2	int k = 1;
24			for (int i = 1; i <= maxThreads;) {
25			System.out.print(" " + i);
26			oneTest(i, 10000, false);
27			Thread.sleep(100);
28			if (i == k) {
29			k = i << 1;
30			i = i + (i >>> 1);
31			}
32			else
33			i = k;
34			}
35			}
36			System.out.println();
37
38	dl	1.1	int k = 1;
39			for (int i = 1; i <= maxThreads;) {
40			System.out.println("Threads:" + i);
41	dl	1.2	oneTest(i, maxIters, true);
42	dl	1.1	Thread.sleep(100);
43			if (i == k) {
44			k = i << 1;
45			i = i + (i >>> 1);
46			}
47			else
48			i = k;
49			}
50			}
51
52	dl	1.2	static void oneTest(int nThreads, int iters, boolean print) throws Exception {
53	dl	1.4	Thread.sleep(100); // System.gc();
54			if (print) System.out.print("LinkedTransferQueue ");
55			oneRun(new LinkedTransferQueue<Runnable>(), nThreads, iters, print);
56
57			Thread.sleep(100); // System.gc();
58			if (print) System.out.print("LinkedBlockingQueue ");
59			oneRun(new LinkedBlockingQueue<Runnable>(), nThreads, iters, print);
60
61			Thread.sleep(100); // System.gc();
62			if (print) System.out.print("SynchronousQueue ");
63	dl	1.2	oneRun(new SynchronousQueue<Runnable>(false), nThreads, iters, print);
64	dl	1.4
65			Thread.sleep(100); // System.gc();
66			if (print) System.out.print("SynchronousQueue(fair) ");
67	dl	1.2	oneRun(new SynchronousQueue<Runnable>(true), nThreads, iters, print);
68	dl	1.4
69			Thread.sleep(100); // System.gc();
70			if (print) System.out.print("LinkedTransferQueue(xfer)");
71			oneRun(new LTQasSQ<Runnable>(), nThreads, iters, print);
72
73			Thread.sleep(100); // System.gc();
74			if (print) System.out.print("LinkedTransferQueue(half)");
75			oneRun(new HalfSyncLTQ<Runnable>(), nThreads, iters, print);
76
77			Thread.sleep(100); // System.gc();
78			if (print) System.out.print("ArrayBlockingQueue(256) ");
79			oneRun(new ArrayBlockingQueue<Runnable>(256), nThreads, iters, print);
80
81	dl	1.1	}
82
83			static final class Task implements Runnable {
84			final ThreadPoolExecutor pool;
85			final CountDownLatch done;
86			Task(ThreadPoolExecutor p, CountDownLatch d) {
87			pool = p;
88			done = d;
89			}
90			public void run() {
91			done.countDown();
92			remaining.incrementAndGet();
93			int n;
94			while (!Thread.interrupted() &&
95			(n = remaining.get()) > 0 &&
96			done.getCount() > 0) {
97			if (remaining.compareAndSet(n, n-1)) {
98			try {
99			pool.execute(this);
100			}
101			catch (RuntimeException ex) {
102			System.out.print("*");
103			while (done.getCount() > 0) done.countDown();
104			return;
105			}
106			}
107			}
108			}
109			}
110
111	dl	1.2	static void oneRun(BlockingQueue<Runnable> q, int nThreads, int iters, boolean print) throws Exception {
112	dl	1.1
113			ThreadPoolExecutor pool =
114			new ThreadPoolExecutor(nThreads+1, Integer.MAX_VALUE,
115			1L, TimeUnit.SECONDS, q);
116
117	dl	1.2	CountDownLatch done = new CountDownLatch(iters);
118	dl	1.1	remaining.set(nThreads-1);
119			pool.prestartAllCoreThreads();
120			Task t = new Task(pool, done);
121			long start = System.nanoTime();
122			pool.execute(t);
123			done.await();
124			long time = System.nanoTime() - start;
125	dl	1.2	if (print)
126			System.out.println("\t: " + LoopHelpers.rightJustify(time / iters) + " ns per task");
127			q.clear();
128			Thread.sleep(100);
129			pool.shutdown();
130			Thread.sleep(100);
131	dl	1.1	pool.shutdownNow();
132			}
133
134	dl	1.4	static final class LTQasSQ<T> extends LinkedTransferQueue<T> {
135			LTQasSQ() { super(); }
136			public void put(T x) {
137			try { super.transfer(x);
138			} catch (InterruptedException ex) { throw new Error(); }
139			}
140			}
141
142			static final class HalfSyncLTQ<T> extends LinkedTransferQueue<T> {
143			int calls;
144			HalfSyncLTQ() { super(); }
145			public void put(T x) {
146			if ((++calls & 1) == 0)
147			super.put(x);
148			else {
149			try { super.transfer(x);
150			} catch (InterruptedException ex) {
151			throw new Error();
152			}
153			}
154			}
155			}
156
157	dl	1.1	}