test/loops/CollectionLoops.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.*;
import java.util.concurrent.*;

public class CollectionLoops {
    static int pinsert     = 100;
    static int premove     = 1;
    static int maxThreads  = 48;
    static int removesPerMaxRandom;
    static int insertsPerMaxRandom;
    static volatile int checkSum = 0;
    static boolean print = false;

    static final ExecutorService pool = Executors.newCachedThreadPool();

    public static void main(String[] args) throws Exception {
        int nkeys       = 10000;
        int nops        = 100000;

        Class collectionClass = null;
        if (args.length > 0) {
            try {
                collectionClass = Class.forName(args[0]);
            } catch (ClassNotFoundException e) {
                throw new RuntimeException("Class " + args[0] + " not found.");
            }
        }

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

        if (args.length > 2)
            nkeys = Integer.parseInt(args[2]);

        if (args.length > 3)
            pinsert = Integer.parseInt(args[3]);

        if (args.length > 4)
            premove = Integer.parseInt(args[4]);

        if (args.length > 5)
            nops = Integer.parseInt(args[5]);

        // normalize probabilities wrt random number generator
        removesPerMaxRandom = (int)(((double)premove/100.0 * 0x7FFFFFFFL));
        insertsPerMaxRandom = (int)(((double)pinsert/100.0 * 0x7FFFFFFFL));

        System.out.print("Class: " + collectionClass.getName());
        System.out.print(" threads: " + maxThreads);
        System.out.print(" size: " + nkeys);
        System.out.print(" ins: " + pinsert);
        System.out.print(" rem: " + premove);
        System.out.print(" ops: " + nops);
        System.out.println();

        // warmup
        test(1, 100, 100, collectionClass);
        test(2, 100, 100, collectionClass);
        test(4, 100, 100, collectionClass);
        print = true;

        int k = 1;
        int warmups = 2;
        for (int i = 1; i <= maxThreads;) {
            Thread.sleep(100);
            test(i, nkeys, nops, collectionClass);
            if (warmups > 0)
                --warmups;
            else if (i == k) {
                k = i << 1;
                i = i + (i >>> 1);
            }
            else if (i == 1 && k == 2) {
                i = k;
                warmups = 1;
            }
            else
                i = k;
        }
        pool.shutdown();
    }

    static Integer[] makeKeys(int n) {
        LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom();
        Integer[] key = new Integer[n];
        for (int i = 0; i < key.length; ++i)
            key[i] = new Integer(rng.next());
        return key;
    }

    static void shuffleKeys(Integer[] key) {
        Random rng = new Random();
        for (int i = key.length; i > 1; --i) {
            int j = rng.nextInt(i);
            Integer tmp = key[j];
            key[j] = key[i-1];
            key[i-1] = tmp;
        }
    }

    static void test(int i, int nk, int nops, Class collectionClass) throws Exception {
        if (print)
            System.out.print("Threads: " + i + "\t:");
        Collection<Integer> collection = (Collection<Integer>)collectionClass.newInstance();
        Integer[] key = makeKeys(nk);
        // Uncomment to start with a non-empty table
        for (int j = 0; j < nk; j += 2)
            collection.add(key[j]);
        shuffleKeys(key);
        LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
        CyclicBarrier barrier = new CyclicBarrier(i+1, timer);
        for (int t = 0; t < i; ++t)
            pool.execute(new Runner(t, collection, key, barrier, nops));
        barrier.await();
        barrier.await();
        long time = timer.getTime();
        long tpo = time / (i * (long) nops);
        if (print)
            System.out.print(LoopHelpers.rightJustify(tpo) + " ns per op");
        double secs = (double) time / 1000000000.0;
        if (print)
            System.out.print("\t " + secs + "s run time");
        if (checkSum == 0) System.out.print(" ");
        if (print)
            System.out.println();
        collection.clear();
    }

    static class Runner implements Runnable {
        final Collection<Integer> collection;
        final Integer[] key;
        final LoopHelpers.SimpleRandom rng;
        final CyclicBarrier barrier;
        int position;
        int total;
        int nops;

        Runner(int id, Collection<Integer> collection, Integer[] key, CyclicBarrier barrier, int nops) {
            this.collection = collection;
            this.key = key;
            this.barrier = barrier;
            this.nops = nops;
            position = key.length / (id + 1);
            rng = new LoopHelpers.SimpleRandom((id + 1) * 8862213513L);
            rng.next();
        }

        public void run() {
            try {
                barrier.await();
                int p = position;
                int ops = nops;
                Collection<Integer> c = collection;
                while (ops > 0) {
                    int r = rng.next();
                    p += (r & 7) - 3;
                    while (p >= key.length) p -= key.length;
                    while (p < 0) p += key.length;

                    Integer k = key[p];
                    if (c.contains(k)) {
                        if (r < removesPerMaxRandom) {
                            if (c.remove(k)) {
                                p = Math.abs(total % key.length);
                                ops -= 2;
                                continue;
                            }
                        }
                    }
                    else if (r < insertsPerMaxRandom) {
                        ++p;
                        ops -= 2;
                        c.add(k);
                        continue;
                    }

                    total += LoopHelpers.compute6(k.intValue());
                    --ops;
                }
                checkSum += total;
                barrier.await();
            }
            catch (Exception ex) {
                throw new RuntimeException(ex);
            }
        }
    }
}
Revision:	1.7
Committed:	Mon Dec 5 04:08:46 2011 UTC (12 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.6:	+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	1.6	* http://creativecommons.org/publicdomain/zero/1.0/
5	dl	1.1	*/
6
7
8			import java.util.*;
9			import java.util.concurrent.*;
10
11			public class CollectionLoops {
12			static int pinsert = 100;
13			static int premove = 1;
14			static int maxThreads = 48;
15			static int removesPerMaxRandom;
16			static int insertsPerMaxRandom;
17			static volatile int checkSum = 0;
18			static boolean print = false;
19
20			static final ExecutorService pool = Executors.newCachedThreadPool();
21
22			public static void main(String[] args) throws Exception {
23			int nkeys = 10000;
24			int nops = 100000;
25
26			Class collectionClass = null;
27			if (args.length > 0) {
28			try {
29			collectionClass = Class.forName(args[0]);
30	jsr166	1.4	} catch (ClassNotFoundException e) {
31	dl	1.1	throw new RuntimeException("Class " + args[0] + " not found.");
32			}
33			}
34
35	jsr166	1.3	if (args.length > 1)
36	dl	1.1	maxThreads = Integer.parseInt(args[1]);
37
38	jsr166	1.3	if (args.length > 2)
39	dl	1.1	nkeys = Integer.parseInt(args[2]);
40
41	jsr166	1.3	if (args.length > 3)
42	dl	1.1	pinsert = Integer.parseInt(args[3]);
43
44	jsr166	1.3	if (args.length > 4)
45	dl	1.1	premove = Integer.parseInt(args[4]);
46
47	jsr166	1.3	if (args.length > 5)
48	dl	1.1	nops = Integer.parseInt(args[5]);
49
50			// normalize probabilities wrt random number generator
51			removesPerMaxRandom = (int)(((double)premove/100.0 * 0x7FFFFFFFL));
52			insertsPerMaxRandom = (int)(((double)pinsert/100.0 * 0x7FFFFFFFL));
53	jsr166	1.3
54	dl	1.1	System.out.print("Class: " + collectionClass.getName());
55			System.out.print(" threads: " + maxThreads);
56			System.out.print(" size: " + nkeys);
57			System.out.print(" ins: " + pinsert);
58			System.out.print(" rem: " + premove);
59			System.out.print(" ops: " + nops);
60			System.out.println();
61
62			// warmup
63			test(1, 100, 100, collectionClass);
64			test(2, 100, 100, collectionClass);
65			test(4, 100, 100, collectionClass);
66			print = true;
67
68			int k = 1;
69			int warmups = 2;
70			for (int i = 1; i <= maxThreads;) {
71			Thread.sleep(100);
72			test(i, nkeys, nops, collectionClass);
73			if (warmups > 0)
74			--warmups;
75			else if (i == k) {
76			k = i << 1;
77			i = i + (i >>> 1);
78	jsr166	1.3	}
79	dl	1.1	else if (i == 1 && k == 2) {
80			i = k;
81			warmups = 1;
82			}
83	jsr166	1.3	else
84	dl	1.1	i = k;
85			}
86			pool.shutdown();
87			}
88
89			static Integer[] makeKeys(int n) {
90			LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom();
91			Integer[] key = new Integer[n];
92	jsr166	1.3	for (int i = 0; i < key.length; ++i)
93	dl	1.1	key[i] = new Integer(rng.next());
94			return key;
95			}
96
97			static void shuffleKeys(Integer[] key) {
98			Random rng = new Random();
99			for (int i = key.length; i > 1; --i) {
100			int j = rng.nextInt(i);
101			Integer tmp = key[j];
102			key[j] = key[i-1];
103			key[i-1] = tmp;
104			}
105			}
106
107			static void test(int i, int nk, int nops, Class collectionClass) throws Exception {
108			if (print)
109			System.out.print("Threads: " + i + "\t:");
110			Collection<Integer> collection = (Collection<Integer>)collectionClass.newInstance();
111			Integer[] key = makeKeys(nk);
112			// Uncomment to start with a non-empty table
113	jsr166	1.3	for (int j = 0; j < nk; j += 2)
114	dl	1.1	collection.add(key[j]);
115			shuffleKeys(key);
116			LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
117			CyclicBarrier barrier = new CyclicBarrier(i+1, timer);
118	jsr166	1.3	for (int t = 0; t < i; ++t)
119	dl	1.1	pool.execute(new Runner(t, collection, key, barrier, nops));
120			barrier.await();
121			barrier.await();
122			long time = timer.getTime();
123	jsr166	1.5	long tpo = time / (i * (long) nops);
124	dl	1.1	if (print)
125			System.out.print(LoopHelpers.rightJustify(tpo) + " ns per op");
126	jsr166	1.5	double secs = (double) time / 1000000000.0;
127	dl	1.1	if (print)
128			System.out.print("\t " + secs + "s run time");
129			if (checkSum == 0) System.out.print(" ");
130			if (print)
131			System.out.println();
132			collection.clear();
133			}
134
135			static class Runner implements Runnable {
136			final Collection<Integer> collection;
137			final Integer[] key;
138			final LoopHelpers.SimpleRandom rng;
139			final CyclicBarrier barrier;
140			int position;
141			int total;
142			int nops;
143
144	jsr166	1.7	Runner(int id, Collection<Integer> collection, Integer[] key, CyclicBarrier barrier, int nops) {
145	jsr166	1.3	this.collection = collection;
146			this.key = key;
147	dl	1.1	this.barrier = barrier;
148			this.nops = nops;
149	jsr166	1.3	position = key.length / (id + 1);
150	dl	1.1	rng = new LoopHelpers.SimpleRandom((id + 1) * 8862213513L);
151			rng.next();
152			}
153
154			public void run() {
155			try {
156			barrier.await();
157			int p = position;
158			int ops = nops;
159			Collection<Integer> c = collection;
160			while (ops > 0) {
161			int r = rng.next();
162			p += (r & 7) - 3;
163	jsr166	1.3	while (p >= key.length) p -= key.length;
164	dl	1.1	while (p < 0) p += key.length;
165
166			Integer k = key[p];
167			if (c.contains(k)) {
168			if (r < removesPerMaxRandom) {
169			if (c.remove(k)) {
170	jsr166	1.3	p = Math.abs(total % key.length);
171	dl	1.1	ops -= 2;
172			continue;
173			}
174			}
175			}
176			else if (r < insertsPerMaxRandom) {
177			++p;
178			ops -= 2;
179			c.add(k);
180			continue;
181	jsr166	1.3	}
182
183	dl	1.1	total += LoopHelpers.compute6(k.intValue());
184			--ops;
185			}
186			checkSum += total;
187			barrier.await();
188			}
189			catch (Exception ex) {
190			throw new RuntimeException(ex);
191			}
192			}
193			}
194			}