test/loops/MapLoops.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 MapLoops {
    static int nkeys       = 1000;
    static int pinsert     = 60;
    static int premove     = 2;
    static int maxThreads  = 100;
    static int nops        = 1000000;
    static int removesPerMaxRandom;
    static int insertsPerMaxRandom;

    static final ExecutorService pool = Executors.newCachedThreadPool();

    public static void main(String[] args) throws Exception {

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

        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: " + mapClass.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();

        int warmups = 2;
        for (int k = 1, i = 1; i <= maxThreads;) {
            Thread.sleep(100);
            test(i, nkeys, mapClass);
            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 nkeys, Class mapClass) throws Exception {
        System.out.print("Threads: " + i + "\t:");
        Map<Integer, Integer> map = (Map<Integer,Integer>)mapClass.newInstance();
        Integer[] key = makeKeys(nkeys);
        // Uncomment to start with a non-empty table
        //        for (int j = 0; j < nkeys; j += 4) // start 1/4 occupied
        //            map.put(key[j], 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, map, key, barrier));
        barrier.await();
        barrier.await();
        long time = timer.getTime();
        long tpo = time / (i * (long) nops);
        System.out.print(LoopHelpers.rightJustify(tpo) + " ns per op");
        double secs = (double) time / 1000000000.0;
        System.out.println("\t " + secs + "s run time");
        map.clear();
    }

    static class Runner implements Runnable {
        final Map<Integer,Integer> map;
        final Integer[] key;
        final LoopHelpers.SimpleRandom rng;
        final CyclicBarrier barrier;
        int position;
        int total;

        Runner(int id, Map<Integer,Integer> map, Integer[] key, CyclicBarrier barrier) {
            this.map = map;
            this.key = key;
            this.barrier = barrier;
            position = key.length / 2;
            rng = new LoopHelpers.SimpleRandom((id + 1) * 8862213513L);
            rng.next();
        }

        int step() {
            // random-walk around key positions, bunching accesses
            int r = rng.next();
            position += (r & 7) - 3;
            while (position >= key.length) position -= key.length;
            while (position < 0) position += key.length;

            Integer k = key[position];
            Integer x = map.get(k);

            if (x != null) {
                if (x.intValue() != k.intValue())
                    throw new Error("bad mapping: " + x + " to " + k);

                if (r < removesPerMaxRandom) {
                    if (map.remove(k) != null) {
                        position = total % key.length; // move from position
                        return 2;
                    }
                }
            }
            else if (r < insertsPerMaxRandom) {
                ++position;
                map.put(k, k);
                return 2;
            }

            // Uncomment to add a little computation between accesses
            //            total += LoopHelpers.compute1(k.intValue());
            total += r;
            return 1;
        }

        public void run() {
            try {
                barrier.await();
                int ops = nops;
                while (ops > 0)
                    ops -= step();
                barrier.await();
            }
            catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }
}
Revision:	1.10
Committed:	Thu Dec 18 18:13:06 2014 UTC (9 years, 4 months ago) by jsr166
Branch:	MAIN
Changes since 1.9:	+1 -2 lines
Log Message:	move k = 1 into loop initializer
#	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	jsr166	1.7	* http://creativecommons.org/publicdomain/zero/1.0/
5	dl	1.1	*/
6
7			import java.util.*;
8			import java.util.concurrent.*;
9
10			public class MapLoops {
11	jsr166	1.4	static int nkeys = 1000;
12	dl	1.1	static int pinsert = 60;
13			static int premove = 2;
14			static int maxThreads = 100;
15	dl	1.2	static int nops = 1000000;
16	dl	1.1	static int removesPerMaxRandom;
17			static int insertsPerMaxRandom;
18
19			static final ExecutorService pool = Executors.newCachedThreadPool();
20
21			public static void main(String[] args) throws Exception {
22
23			Class mapClass = null;
24			if (args.length > 0) {
25			try {
26			mapClass = Class.forName(args[0]);
27	jsr166	1.5	} catch (ClassNotFoundException e) {
28	dl	1.1	throw new RuntimeException("Class " + args[0] + " not found.");
29			}
30			}
31	jsr166	1.4	else
32	dl	1.1	mapClass = java.util.concurrent.ConcurrentHashMap.class;
33
34	jsr166	1.4	if (args.length > 1)
35	dl	1.1	maxThreads = Integer.parseInt(args[1]);
36
37	jsr166	1.4	if (args.length > 2)
38	dl	1.1	nkeys = Integer.parseInt(args[2]);
39
40	jsr166	1.4	if (args.length > 3)
41	dl	1.1	pinsert = Integer.parseInt(args[3]);
42
43	jsr166	1.4	if (args.length > 4)
44	dl	1.1	premove = Integer.parseInt(args[4]);
45
46	jsr166	1.4	if (args.length > 5)
47	dl	1.1	nops = Integer.parseInt(args[5]);
48
49			// normalize probabilities wrt random number generator
50			removesPerMaxRandom = (int)(((double)premove/100.0 * 0x7FFFFFFFL));
51			insertsPerMaxRandom = (int)(((double)pinsert/100.0 * 0x7FFFFFFFL));
52	jsr166	1.4
53	dl	1.1	System.out.print("Class: " + mapClass.getName());
54			System.out.print(" threads: " + maxThreads);
55			System.out.print(" size: " + nkeys);
56			System.out.print(" ins: " + pinsert);
57			System.out.print(" rem: " + premove);
58			System.out.print(" ops: " + nops);
59			System.out.println();
60
61			int warmups = 2;
62	jsr166	1.10	for (int k = 1, i = 1; i <= maxThreads;) {
63	dl	1.1	Thread.sleep(100);
64			test(i, nkeys, mapClass);
65			if (warmups > 0)
66			--warmups;
67			else if (i == k) {
68			k = i << 1;
69			i = i + (i >>> 1);
70	jsr166	1.4	}
71	dl	1.1	else if (i == 1 && k == 2) {
72			i = k;
73			warmups = 1;
74			}
75	jsr166	1.4	else
76	dl	1.1	i = k;
77			}
78			pool.shutdown();
79			}
80
81			static Integer[] makeKeys(int n) {
82			LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom();
83			Integer[] key = new Integer[n];
84	jsr166	1.4	for (int i = 0; i < key.length; ++i)
85	dl	1.1	key[i] = new Integer(rng.next());
86			return key;
87			}
88
89			static void shuffleKeys(Integer[] key) {
90			Random rng = new Random();
91			for (int i = key.length; i > 1; --i) {
92			int j = rng.nextInt(i);
93			Integer tmp = key[j];
94			key[j] = key[i-1];
95			key[i-1] = tmp;
96			}
97			}
98
99			static void test(int i, int nkeys, Class mapClass) throws Exception {
100			System.out.print("Threads: " + i + "\t:");
101			Map<Integer, Integer> map = (Map<Integer,Integer>)mapClass.newInstance();
102			Integer[] key = makeKeys(nkeys);
103			// Uncomment to start with a non-empty table
104			// for (int j = 0; j < nkeys; j += 4) // start 1/4 occupied
105			// map.put(key[j], key[j]);
106	dl	1.2	shuffleKeys(key);
107	dl	1.1	LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
108			CyclicBarrier barrier = new CyclicBarrier(i+1, timer);
109	jsr166	1.4	for (int t = 0; t < i; ++t)
110	dl	1.2	pool.execute(new Runner(t, map, key, barrier));
111	dl	1.1	barrier.await();
112			barrier.await();
113			long time = timer.getTime();
114	jsr166	1.6	long tpo = time / (i * (long) nops);
115	dl	1.1	System.out.print(LoopHelpers.rightJustify(tpo) + " ns per op");
116	jsr166	1.6	double secs = (double) time / 1000000000.0;
117	dl	1.1	System.out.println("\t " + secs + "s run time");
118			map.clear();
119			}
120
121			static class Runner implements Runnable {
122			final Map<Integer,Integer> map;
123			final Integer[] key;
124	dl	1.2	final LoopHelpers.SimpleRandom rng;
125	dl	1.1	final CyclicBarrier barrier;
126			int position;
127			int total;
128
129	jsr166	1.8	Runner(int id, Map<Integer,Integer> map, Integer[] key, CyclicBarrier barrier) {
130	jsr166	1.4	this.map = map;
131			this.key = key;
132	dl	1.1	this.barrier = barrier;
133	jsr166	1.4	position = key.length / 2;
134	dl	1.2	rng = new LoopHelpers.SimpleRandom((id + 1) * 8862213513L);
135			rng.next();
136	dl	1.1	}
137
138			int step() {
139	jsr166	1.9	// random-walk around key positions, bunching accesses
140	dl	1.1	int r = rng.next();
141			position += (r & 7) - 3;
142	jsr166	1.4	while (position >= key.length) position -= key.length;
143	dl	1.1	while (position < 0) position += key.length;
144
145			Integer k = key[position];
146			Integer x = map.get(k);
147
148			if (x != null) {
149	jsr166	1.4	if (x.intValue() != k.intValue())
150	dl	1.1	throw new Error("bad mapping: " + x + " to " + k);
151
152			if (r < removesPerMaxRandom) {
153			if (map.remove(k) != null) {
154			position = total % key.length; // move from position
155			return 2;
156			}
157			}
158			}
159			else if (r < insertsPerMaxRandom) {
160			++position;
161			map.put(k, k);
162			return 2;
163	jsr166	1.4	}
164	dl	1.1
165			// Uncomment to add a little computation between accesses
166			// total += LoopHelpers.compute1(k.intValue());
167			total += r;
168			return 1;
169			}
170
171			public void run() {
172			try {
173			barrier.await();
174			int ops = nops;
175	jsr166	1.4	while (ops > 0)
176	dl	1.1	ops -= step();
177			barrier.await();
178			}
179			catch (Exception ex) {
180			ex.printStackTrace();
181			}
182			}
183			}
184			}