| 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 |
import java.util.*; |
| 7 |
import java.io.*; |
| 8 |
|
| 9 |
public class MapWordLoops { |
| 10 |
|
| 11 |
static final String[] WORDS_FILES = { |
| 12 |
"kw.txt", |
| 13 |
"class.txt", |
| 14 |
"dir.txt", |
| 15 |
"ids.txt", |
| 16 |
"/usr/dict/words", |
| 17 |
}; |
| 18 |
|
| 19 |
static final int MAX_WORDS = 500000; |
| 20 |
static final int pinsert = 60; |
| 21 |
static final int premove = 1; |
| 22 |
static final int NOPS = 5000000; |
| 23 |
static final int numTests = 3; |
| 24 |
|
| 25 |
public static void main(String[] args) { |
| 26 |
Class mapClass = null; |
| 27 |
try { |
| 28 |
mapClass = Class.forName(args[0]); |
| 29 |
} catch(ClassNotFoundException e) { |
| 30 |
throw new RuntimeException("Class " + args[0] + " not found."); |
| 31 |
} |
| 32 |
|
| 33 |
System.out.println("Testing " + mapClass.getName()); |
| 34 |
|
| 35 |
for (int s = 0; s < WORDS_FILES.length; ++s) |
| 36 |
tests(mapClass, numTests, s); |
| 37 |
|
| 38 |
for (int s = WORDS_FILES.length-1; s >= 0; --s) |
| 39 |
tests(mapClass, numTests, s); |
| 40 |
|
| 41 |
} |
| 42 |
|
| 43 |
static void tests(Class mapClass, int numTests, int sizeIndex) { |
| 44 |
try { |
| 45 |
String[] key = readWords(sizeIndex); |
| 46 |
int size = key.length; |
| 47 |
|
| 48 |
System.out.print("n = " +LoopHelpers.rightJustify(size) +" : "); |
| 49 |
long least = Long.MAX_VALUE; |
| 50 |
|
| 51 |
for (int i = 0; i < numTests; ++i) { |
| 52 |
Map<String,String> m = newMap(mapClass); |
| 53 |
long t = doTest(mapClass.getName(), m, key); |
| 54 |
if (t < least) least = t; |
| 55 |
m.clear(); |
| 56 |
m = null; |
| 57 |
} |
| 58 |
|
| 59 |
long nano = Math.round(1000000.0 * (least) / NOPS); |
| 60 |
System.out.println(LoopHelpers.rightJustify(nano) + " ns per op"); |
| 61 |
} catch (IOException ignore) { |
| 62 |
return; // skip test if can't read file |
| 63 |
} |
| 64 |
} |
| 65 |
|
| 66 |
|
| 67 |
static Map<String,String> newMap(Class cl) { |
| 68 |
try { |
| 69 |
Map m = (Map<String,String>)cl.newInstance(); |
| 70 |
return m; |
| 71 |
} catch(Exception e) { |
| 72 |
throw new RuntimeException("Can't instantiate " + cl + ": " + e); |
| 73 |
} |
| 74 |
} |
| 75 |
|
| 76 |
static void pause() { |
| 77 |
try { Thread.sleep(100); } catch(InterruptedException ie) { return; } |
| 78 |
} |
| 79 |
|
| 80 |
static String[] readWords(int sizeIndex) throws IOException { |
| 81 |
String[] l = new String[MAX_WORDS]; |
| 82 |
String[] array = null; |
| 83 |
try { |
| 84 |
FileReader fr = new FileReader(WORDS_FILES[sizeIndex]); |
| 85 |
BufferedReader reader = new BufferedReader(fr); |
| 86 |
int k = 0; |
| 87 |
for (;;) { |
| 88 |
String s = reader.readLine(); |
| 89 |
if (s == null) break; |
| 90 |
l[k++] = s; |
| 91 |
} |
| 92 |
array = new String[k]; |
| 93 |
for (int i = 0; i < k; ++i) { |
| 94 |
array[i] = l[i]; |
| 95 |
l[i] = null; |
| 96 |
} |
| 97 |
l = null; |
| 98 |
reader.close(); |
| 99 |
} |
| 100 |
catch (IOException ex) { |
| 101 |
System.out.println("Can't read words file:" + ex); |
| 102 |
throw ex; |
| 103 |
} |
| 104 |
return array; |
| 105 |
} |
| 106 |
|
| 107 |
static long doTest(String name, |
| 108 |
final Map<String,String> m, |
| 109 |
final String[] key) { |
| 110 |
|
| 111 |
// System.out.print(name + "\t"); |
| 112 |
Runner runner = new Runner(m, key); |
| 113 |
long startTime = System.currentTimeMillis(); |
| 114 |
runner.run(); |
| 115 |
long afterRun = System.currentTimeMillis(); |
| 116 |
long runTime = (afterRun - startTime); |
| 117 |
int np = runner.total; |
| 118 |
if (runner.total == runner.hashCode()) |
| 119 |
System.out.println("Useless Number" + runner.total); |
| 120 |
int sz = runner.maxsz; |
| 121 |
if (sz == runner.hashCode()) |
| 122 |
System.out.println("Useless Number" + sz); |
| 123 |
// System.out.print(" m = " + sz); |
| 124 |
return runTime; |
| 125 |
} |
| 126 |
|
| 127 |
|
| 128 |
static class Runner implements Runnable { |
| 129 |
final Map<String,String> map; |
| 130 |
final String[] key; |
| 131 |
LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom(); |
| 132 |
final int pctrem; |
| 133 |
final int pctins; |
| 134 |
int nputs = 0; |
| 135 |
int npgets = 0; |
| 136 |
int nagets = 0; |
| 137 |
int nremoves = 0; |
| 138 |
volatile int total; |
| 139 |
int maxsz; |
| 140 |
|
| 141 |
Runner(Map<String,String> m, String[] k) { |
| 142 |
map = m; key = k; |
| 143 |
pctrem = (int)(((long)premove * (long)(Integer.MAX_VALUE/2)) / 50); |
| 144 |
pctins = (int)(((long)pinsert * (long)(Integer.MAX_VALUE/2)) / 50); |
| 145 |
} |
| 146 |
|
| 147 |
|
| 148 |
int oneStep(int j) { |
| 149 |
int n = key.length; |
| 150 |
int r = rng.next() & 0x7FFFFFFF; |
| 151 |
int jinc = (r & 7); |
| 152 |
j += jinc - 3; |
| 153 |
if (j >= n) j -= n; |
| 154 |
if (j < 0) j += n; |
| 155 |
|
| 156 |
int l = n / 4 + j; |
| 157 |
if (l >= n) l -= n; |
| 158 |
|
| 159 |
String k = key[j]; |
| 160 |
String x = map.get(k); |
| 161 |
|
| 162 |
if (x == null) { |
| 163 |
++nagets; |
| 164 |
if (r < pctins) { |
| 165 |
map.put(k, key[l]); |
| 166 |
++nputs; |
| 167 |
int csz = nputs - nremoves; |
| 168 |
if (csz > maxsz) maxsz = csz; |
| 169 |
} |
| 170 |
} |
| 171 |
else { |
| 172 |
if (k== x) ++npgets; |
| 173 |
if (r < pctrem) { |
| 174 |
map.remove(k); |
| 175 |
++nremoves; |
| 176 |
j += ((r >>> 8) & 7) + n / 2; |
| 177 |
if (j >= n) j -= n; |
| 178 |
} |
| 179 |
} |
| 180 |
return j; |
| 181 |
} |
| 182 |
|
| 183 |
public void run() { |
| 184 |
int j = key.length / 2; |
| 185 |
for (int i = 0; i < NOPS; ++i) { |
| 186 |
j = oneStep(j); |
| 187 |
} |
| 188 |
total = nputs + npgets + nagets + nremoves; |
| 189 |
} |
| 190 |
} |
| 191 |
|
| 192 |
} |
