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       = 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();

        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;
        }
        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:	1.2
Committed:	Mon Feb 19 00:46:06 2007 UTC (17 years, 2 months ago) by dl
Branch:	MAIN
Changes since 1.1:	+2 -12 lines
Log Message:	Uniform headers
#	Content
1	/*
2	* Written by Doug Lea with assistance from members of JCP JSR-166
3	* Expert Group and released to the public domain, as explained at
4	* http://creativecommons.org/licenses/publicdomain
5	*/
6
7	import java.util.*;
8	import java.util.concurrent.*;
9
10	public class StringMapLoops {
11	static int nkeys = 1000;
12	static int pinsert = 60;
13	static int premove = 2;
14	static int maxThreads = 100;
15	static int nops = 1000000;
16	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	} catch(ClassNotFoundException e) {
28	throw new RuntimeException("Class " + args[0] + " not found.");
29	}
30	}
31	else
32	mapClass = java.util.concurrent.ConcurrentHashMap.class;
33
34	if (args.length > 1)
35	maxThreads = Integer.parseInt(args[1]);
36
37	if (args.length > 2)
38	nkeys = Integer.parseInt(args[2]);
39
40	if (args.length > 3)
41	pinsert = Integer.parseInt(args[3]);
42
43	if (args.length > 4)
44	premove = Integer.parseInt(args[4]);
45
46	if (args.length > 5)
47	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
53	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	}
75	else if (i == 1 && k == 2) {
76	i = k;
77	warmups = 1;
78	}
79	else
80	i = k;
81	}
82	pool.shutdown();
83	}
84
85	static String[] makeKeys(int n) {
86	LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom();
87	String[] key = new String[n];
88	for (int i = 0; i < key.length; ++i) {
89	int k = 0;
90	int len = 1 + (rng.next() & 0xf);
91	char[] c = new char[len * 4];
92	for (int j = 0; j < len; ++j) {
93	int r = rng.next();
94	c[k++] = (char)(' ' + (r & 0x7f));
95	r >>>= 8;
96	c[k++] = (char)(' ' + (r & 0x7f));
97	r >>>= 8;
98	c[k++] = (char)(' ' + (r & 0x7f));
99	r >>>= 8;
100	c[k++] = (char)(' ' + (r & 0x7f));
101	}
102	key[i] = new String(c);
103	}
104	return key;
105	}
106
107	static void shuffleKeys(String[] key) {
108	Random rng = new Random();
109	for (int i = key.length; i > 1; --i) {
110	int j = rng.nextInt(i);
111	String tmp = key[j];
112	key[j] = key[i-1];
113	key[i-1] = tmp;
114	}
115	}
116
117	static void test(int i, int nkeys, String[] key, Class mapClass) throws Exception {
118	System.out.print("Threads: " + i + "\t:");
119	Map<String, String> map = (Map<String,String>)mapClass.newInstance();
120	// Uncomment to start with a non-empty table
121	// for (int j = 0; j < nkeys; j += 4) // start 1/4 occupied
122	// map.put(key[j], key[j]);
123	LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
124	CyclicBarrier barrier = new CyclicBarrier(i+1, timer);
125	for (int t = 0; t < i; ++t)
126	pool.execute(new Runner(t, map, key, barrier));
127	barrier.await();
128	barrier.await();
129	long time = timer.getTime();
130	long tpo = time / (i * (long)nops);
131	System.out.print(LoopHelpers.rightJustify(tpo) + " ns per op");
132	double secs = (double)(time) / 1000000000.0;
133	System.out.println("\t " + secs + "s run time");
134	map.clear();
135	}
136
137	static class Runner implements Runnable {
138	final Map<String,String> map;
139	final String[] key;
140	final LoopHelpers.SimpleRandom rng;
141	final CyclicBarrier barrier;
142	int position;
143	int total;
144
145	Runner(int id, Map<String,String> map, String[] key, CyclicBarrier barrier) {
146	this.map = map;
147	this.key = key;
148	this.barrier = barrier;
149	position = key.length / 2;
150	rng = new LoopHelpers.SimpleRandom((id + 1) * 8862213513L);
151	rng.next();
152	}
153
154	int step() {
155	// random-walk around key positions, bunching accesses
156	int r = rng.next();
157	position += (r & 7) - 3;
158	while (position >= key.length) position -= key.length;
159	while (position < 0) position += key.length;
160
161	String k = key[position];
162	String x = map.get(k);
163
164	if (x != null) {
165	if (r < removesPerMaxRandom) {
166	if (map.remove(k) != null) {
167	position = total % key.length; // move from position
168	return 2;
169	}
170	}
171	}
172	else if (r < insertsPerMaxRandom) {
173	++position;
174	map.put(k, k);
175	return 2;
176	}
177
178	total += r;
179	return 1;
180	}
181
182	public void run() {
183	try {
184	barrier.await();
185	int ops = nops;
186	while (ops > 0)
187	ops -= step();
188	barrier.await();
189	}
190	catch (Exception ex) {
191	ex.printStackTrace();
192	}
193	}
194	}
195	}
196