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

public class StringMapLoops {
    static int nkeys       = 75000;
    static int pinsert     = 60;
    static int premove     =  2;
    static int maxThreads  = 100;
    static int nops        = 8000000;
    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();

        String[] key = makeKeys(nkeys);

        int k = 1;
        int warmups = 2;
        for (int i = 1; i <= maxThreads;) {
            Thread.sleep(100);
            test(i, nkeys, key, mapClass);
            shuffleKeys(key);
            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;
        }
        for (int j = 0; j < 10; ++j) {
            Thread.sleep(100);
            test(1, nkeys, key, mapClass);
            //            shuffleKeys(key);
        }
        pool.shutdown();
    }

    static String[] makeKeys(int n) {
        LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom();
        String[] key = new String[n];
        for (int i = 0; i < key.length; ++i) {
            int k = 0;
            int len = 1 + (rng.next() & 0xf);
            char[] c = new char[len * 4];
            for (int j = 0; j < len; ++j) {
                int r = rng.next();
                c[k++] = (char) (' ' + (r & 0x7f));
                r >>>= 8;
                c[k++] = (char) (' ' + (r & 0x7f));
                r >>>= 8;
                c[k++] = (char) (' ' + (r & 0x7f));
                r >>>= 8;
                c[k++] = (char) (' ' + (r & 0x7f));
            }
            key[i] = new String(c);
        }
        return key;
    }

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

    static void test(int i, int nkeys, String[] key, Class mapClass) throws Exception {
        System.out.print("Threads: " + i + "\t:");
        Map<String, String> map = (Map<String,String>)mapClass.newInstance();
        // 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]);

        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<String,String> map;
        final String[] key;
        final LoopHelpers.SimpleRandom rng;
        final CyclicBarrier barrier;
        int position;
        int total;

        Runner(int id, Map<String,String> map, String[] 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;

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

            if (x != null) {
                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;
            }

            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:	1.6
Committed:	Tue Nov 3 01:04:02 2009 UTC (14 years, 6 months ago) by jsr166
Branch:	MAIN
Changes since 1.5:	+6 -6 lines
Log Message:	coding style
#	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			* http://creativecommons.org/licenses/publicdomain
5	dl	1.1	*/
6
7			import java.util.*;
8			import java.util.concurrent.*;
9
10			public class StringMapLoops {
11	jsr166	1.4	static int nkeys = 75000;
12	dl	1.1	static int pinsert = 60;
13	dl	1.3	static int premove = 2;
14	dl	1.1	static int maxThreads = 100;
15	dl	1.3	static int nops = 8000000;
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			String[] key = makeKeys(nkeys);
62
63			int k = 1;
64			int warmups = 2;
65			for (int i = 1; i <= maxThreads;) {
66			Thread.sleep(100);
67			test(i, nkeys, key, mapClass);
68			shuffleKeys(key);
69			if (warmups > 0)
70			--warmups;
71			else if (i == k) {
72			k = i << 1;
73			i = i + (i >>> 1);
74	jsr166	1.4	}
75	dl	1.1	else if (i == 1 && k == 2) {
76			i = k;
77			warmups = 1;
78			}
79	jsr166	1.4	else
80	dl	1.1	i = k;
81			}
82	dl	1.3	for (int j = 0; j < 10; ++j) {
83			Thread.sleep(100);
84			test(1, nkeys, key, mapClass);
85			// shuffleKeys(key);
86			}
87	dl	1.1	pool.shutdown();
88			}
89
90			static String[] makeKeys(int n) {
91			LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom();
92			String[] key = new String[n];
93			for (int i = 0; i < key.length; ++i) {
94			int k = 0;
95			int len = 1 + (rng.next() & 0xf);
96			char[] c = new char[len * 4];
97			for (int j = 0; j < len; ++j) {
98			int r = rng.next();
99	jsr166	1.6	c[k++] = (char) (' ' + (r & 0x7f));
100	dl	1.1	r >>>= 8;
101	jsr166	1.6	c[k++] = (char) (' ' + (r & 0x7f));
102	dl	1.1	r >>>= 8;
103	jsr166	1.6	c[k++] = (char) (' ' + (r & 0x7f));
104	dl	1.1	r >>>= 8;
105	jsr166	1.6	c[k++] = (char) (' ' + (r & 0x7f));
106	dl	1.1	}
107			key[i] = new String(c);
108			}
109			return key;
110			}
111
112			static void shuffleKeys(String[] key) {
113			Random rng = new Random();
114			for (int i = key.length; i > 1; --i) {
115			int j = rng.nextInt(i);
116			String tmp = key[j];
117			key[j] = key[i-1];
118			key[i-1] = tmp;
119			}
120			}
121
122			static void test(int i, int nkeys, String[] key, Class mapClass) throws Exception {
123			System.out.print("Threads: " + i + "\t:");
124			Map<String, String> map = (Map<String,String>)mapClass.newInstance();
125			// Uncomment to start with a non-empty table
126			// for (int j = 0; j < nkeys; j += 4) // start 1/4 occupied
127			// map.put(key[j], key[j]);
128	dl	1.3
129	dl	1.1	LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
130			CyclicBarrier barrier = new CyclicBarrier(i+1, timer);
131	jsr166	1.4	for (int t = 0; t < i; ++t)
132	dl	1.1	pool.execute(new Runner(t, map, key, barrier));
133			barrier.await();
134			barrier.await();
135			long time = timer.getTime();
136	jsr166	1.6	long tpo = time / (i * (long) nops);
137	dl	1.1	System.out.print(LoopHelpers.rightJustify(tpo) + " ns per op");
138	jsr166	1.6	double secs = (double) time / 1000000000.0;
139	dl	1.1	System.out.println("\t " + secs + "s run time");
140			map.clear();
141			}
142
143			static class Runner implements Runnable {
144			final Map<String,String> map;
145			final String[] key;
146			final LoopHelpers.SimpleRandom rng;
147			final CyclicBarrier barrier;
148			int position;
149			int total;
150
151			Runner(int id, Map<String,String> map, String[] key, CyclicBarrier barrier) {
152	jsr166	1.4	this.map = map;
153			this.key = key;
154	dl	1.1	this.barrier = barrier;
155	jsr166	1.4	position = key.length / 2;
156	dl	1.1	rng = new LoopHelpers.SimpleRandom((id + 1) * 8862213513L);
157			rng.next();
158			}
159
160			int step() {
161			// random-walk around key positions, bunching accesses
162			int r = rng.next();
163			position += (r & 7) - 3;
164	jsr166	1.4	while (position >= key.length) position -= key.length;
165	dl	1.1	while (position < 0) position += key.length;
166
167			String k = key[position];
168			String x = map.get(k);
169
170			if (x != null) {
171			if (r < removesPerMaxRandom) {
172			if (map.remove(k) != null) {
173			position = total % key.length; // move from position
174			return 2;
175			}
176			}
177			}
178			else if (r < insertsPerMaxRandom) {
179			++position;
180			map.put(k, k);
181			return 2;
182	jsr166	1.4	}
183	dl	1.1
184			total += r;
185			return 1;
186			}
187
188			public void run() {
189			try {
190			barrier.await();
191			int ops = nops;
192	jsr166	1.4	while (ops > 0)
193	dl	1.1	ops -= step();
194			barrier.await();
195			}
196			catch (Exception ex) {
197			ex.printStackTrace();
198			}
199			}
200			}
201			}