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/publicdomain/zero/1.0/
 */

import java.io.*;
import java.math.*;
import java.util.*;
import java.util.concurrent.*;

public class StringMapLoops {
    static int nkeys       = 147456;
    static int pinsert     = 60;
    static int premove     =  5;
    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 = new String[nkeys];
        initStringKeys(key, nkeys);
        //        String[] key = makeKeys(nkeys);

        int warmups = 2;
        for (int k = 1, 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 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.putIfAbsent(k, k);
                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();
            }
        }
    }

    static final String wordFile = "testwords.txt";

    // Read in String keys from file if possible
    static void initStringKeys(String[] keys, int n) throws Exception {
        FileInputStream fr = null;
        try {
            fr = new FileInputStream(wordFile);
        } catch (IOException ex) {
            System.out.println("No word file. Using String.valueOf(i)");
            for (int i = 0; i < n; i++)
                keys[i] = String.valueOf(i);
            return;
        }

        BufferedInputStream in = new BufferedInputStream(fr);
        int k = 0;
        outer:while (k < n) {
            StringBuffer sb = new StringBuffer();
            for (;;) {
                int c = in.read();
                if (c < 0)
                    break outer;
                char ch = (char) c;
                if (ch == '\n') {
                    keys[k++] = sb.toString();
                    break;
                }
                if (!Character.isWhitespace(ch))
                    sb.append(ch);
            }
        }
        in.close();

        // fill up remaining keys with path-like compounds of previous pairs
        int j = 0;
        while (k < n)
            keys[k++] = (String) keys[j++] + "/" + (String) keys[j];
    }


}
Revision:	1.12
Committed:	Sat Sep 12 20:27:43 2015 UTC (8 years, 7 months ago) by dl
Branch:	MAIN
Changes since 1.11:	+51 -26 lines
Log Message:	Better keys
#	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/publicdomain/zero/1.0/
5	*/
6
7	import java.io.*;
8	import java.math.*;
9	import java.util.*;
10	import java.util.concurrent.*;
11
12	public class StringMapLoops {
13	static int nkeys = 147456;
14	static int pinsert = 60;
15	static int premove = 5;
16	static int maxThreads = 100;
17	static int nops = 8000000;
18	static int removesPerMaxRandom;
19	static int insertsPerMaxRandom;
20
21	static final ExecutorService pool = Executors.newCachedThreadPool();
22
23	public static void main(String[] args) throws Exception {
24
25	Class<?> mapClass = null;
26	if (args.length > 0) {
27	try {
28	mapClass = Class.forName(args[0]);
29	} catch (ClassNotFoundException e) {
30	throw new RuntimeException("Class " + args[0] + " not found.");
31	}
32	}
33	else
34	mapClass = java.util.concurrent.ConcurrentHashMap.class;
35
36	if (args.length > 1)
37	maxThreads = Integer.parseInt(args[1]);
38
39	if (args.length > 2)
40	nkeys = Integer.parseInt(args[2]);
41
42	if (args.length > 3)
43	pinsert = Integer.parseInt(args[3]);
44
45	if (args.length > 4)
46	premove = Integer.parseInt(args[4]);
47
48	if (args.length > 5)
49	nops = Integer.parseInt(args[5]);
50
51	// normalize probabilities wrt random number generator
52	removesPerMaxRandom = (int)(((double)premove/100.0 * 0x7FFFFFFFL));
53	insertsPerMaxRandom = (int)(((double)pinsert/100.0 * 0x7FFFFFFFL));
54
55	System.out.print("Class: " + mapClass.getName());
56	System.out.print(" threads: " + maxThreads);
57	System.out.print(" size: " + nkeys);
58	System.out.print(" ins: " + pinsert);
59	System.out.print(" rem: " + premove);
60	System.out.print(" ops: " + nops);
61	System.out.println();
62
63	String[] key = new String[nkeys];
64	initStringKeys(key, nkeys);
65	// String[] key = makeKeys(nkeys);
66
67	int warmups = 2;
68	for (int k = 1, i = 1; i <= maxThreads;) {
69	Thread.sleep(100);
70	test(i, nkeys, key, mapClass);
71	shuffleKeys(key);
72	if (warmups > 0)
73	--warmups;
74	else if (i == k) {
75	k = i << 1;
76	i = i + (i >>> 1);
77	}
78	else if (i == 1 && k == 2) {
79	i = k;
80	warmups = 1;
81	}
82	else
83	i = k;
84	}
85	for (int j = 0; j < 10; ++j) {
86	Thread.sleep(100);
87	test(1, nkeys, key, mapClass);
88	// shuffleKeys(key);
89	}
90	pool.shutdown();
91	}
92
93	static void shuffleKeys(String[] key) {
94	Random rng = new Random();
95	for (int i = key.length; i > 1; --i) {
96	int j = rng.nextInt(i);
97	String tmp = key[j];
98	key[j] = key[i-1];
99	key[i-1] = tmp;
100	}
101	}
102
103	static void test(int i, int nkeys, String[] key, Class<?> mapClass) throws Exception {
104	System.out.print("Threads: " + i + "\t:");
105	Map<String, String> map = (Map<String,String>)mapClass.newInstance();
106	// Uncomment to start with a non-empty table
107	// for (int j = 0; j < nkeys; j += 4) // start 1/4 occupied
108	// map.put(key[j], key[j]);
109
110	LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
111	CyclicBarrier barrier = new CyclicBarrier(i+1, timer);
112	for (int t = 0; t < i; ++t)
113	pool.execute(new Runner(t, map, key, barrier));
114	barrier.await();
115	barrier.await();
116	long time = timer.getTime();
117	long tpo = time / (i * (long) nops);
118	System.out.print(LoopHelpers.rightJustify(tpo) + " ns per op");
119	double secs = (double) time / 1000000000.0;
120	System.out.println("\t " + secs + "s run time");
121	map.clear();
122	}
123
124	static class Runner implements Runnable {
125	final Map<String,String> map;
126	final String[] key;
127	final LoopHelpers.SimpleRandom rng;
128	final CyclicBarrier barrier;
129	int position;
130	int total;
131
132	Runner(int id, Map<String,String> map, String[] key, CyclicBarrier barrier) {
133	this.map = map;
134	this.key = key;
135	this.barrier = barrier;
136	position = key.length / 2;
137	rng = new LoopHelpers.SimpleRandom((id + 1) * 8862213513L);
138	rng.next();
139	}
140
141	int step() {
142	// random-walk around key positions, bunching accesses
143	int r = rng.next();
144	position += (r & 7) - 3;
145	while (position >= key.length) position -= key.length;
146	while (position < 0) position += key.length;
147
148	String k = key[position];
149	String x = map.get(k);
150
151	if (x != null) {
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.putIfAbsent(k, k);
162	map.put(k, k);
163	return 2;
164	}
165
166	total += r;
167	return 1;
168	}
169
170	public void run() {
171	try {
172	barrier.await();
173	int ops = nops;
174	while (ops > 0)
175	ops -= step();
176	barrier.await();
177	}
178	catch (Exception ex) {
179	ex.printStackTrace();
180	}
181	}
182	}
183
184	static final String wordFile = "testwords.txt";
185
186	// Read in String keys from file if possible
187	static void initStringKeys(String[] keys, int n) throws Exception {
188	FileInputStream fr = null;
189	try {
190	fr = new FileInputStream(wordFile);
191	} catch (IOException ex) {
192	System.out.println("No word file. Using String.valueOf(i)");
193	for (int i = 0; i < n; i++)
194	keys[i] = String.valueOf(i);
195	return;
196	}
197
198	BufferedInputStream in = new BufferedInputStream(fr);
199	int k = 0;
200	outer:while (k < n) {
201	StringBuffer sb = new StringBuffer();
202	for (;;) {
203	int c = in.read();
204	if (c < 0)
205	break outer;
206	char ch = (char) c;
207	if (ch == '\n') {
208	keys[k++] = sb.toString();
209	break;
210	}
211	if (!Character.isWhitespace(ch))
212	sb.append(ch);
213	}
214	}
215	in.close();
216
217	// fill up remaining keys with path-like compounds of previous pairs
218	int j = 0;
219	while (k < n)
220	keys[k++] = (String) keys[j++] + "/" + (String) keys[j];
221	}
222
223
224
225	}