| 1 |
/* |
| 2 |
* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved. |
| 3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 |
* |
| 5 |
* This code is free software; you can redistribute it and/or modify it |
| 6 |
* under the terms of the GNU General Public License version 2 only, as |
| 7 |
* published by the Free Software Foundation. |
| 8 |
* |
| 9 |
* This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 |
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 |
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 |
* version 2 for more details (a copy is included in the LICENSE file that |
| 13 |
* accompanied this code). |
| 14 |
* |
| 15 |
* You should have received a copy of the GNU General Public License version |
| 16 |
* 2 along with this work; if not, write to the Free Software Foundation, |
| 17 |
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 |
* |
| 19 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 20 |
* or visit www.oracle.com if you need additional information or have any |
| 21 |
* questions. |
| 22 |
*/ |
| 23 |
|
| 24 |
/* |
| 25 |
* @test |
| 26 |
* @summary micro-benchmark correctness mode |
| 27 |
* @run main IteratorMicroBenchmark iterations=1 size=8 warmup=0 |
| 28 |
*/ |
| 29 |
|
| 30 |
import java.lang.ref.WeakReference; |
| 31 |
import java.util.ArrayDeque; |
| 32 |
import java.util.Arrays; |
| 33 |
import java.util.ArrayList; |
| 34 |
import java.util.Collection; |
| 35 |
import java.util.Deque; |
| 36 |
import java.util.Enumeration; |
| 37 |
import java.util.Iterator; |
| 38 |
import java.util.List; |
| 39 |
import java.util.ListIterator; |
| 40 |
import java.util.Map; |
| 41 |
import java.util.PriorityQueue; |
| 42 |
import java.util.Spliterator; |
| 43 |
import java.util.Vector; |
| 44 |
import java.util.concurrent.ArrayBlockingQueue; |
| 45 |
import java.util.concurrent.ConcurrentLinkedDeque; |
| 46 |
import java.util.concurrent.ConcurrentLinkedQueue; |
| 47 |
import java.util.concurrent.LinkedBlockingDeque; |
| 48 |
import java.util.concurrent.LinkedBlockingQueue; |
| 49 |
import java.util.concurrent.LinkedTransferQueue; |
| 50 |
import java.util.concurrent.PriorityBlockingQueue; |
| 51 |
import java.util.concurrent.ConcurrentSkipListMap; |
| 52 |
import java.util.concurrent.CountDownLatch; |
| 53 |
import java.util.concurrent.ThreadLocalRandom; |
| 54 |
import java.util.concurrent.TimeUnit; |
| 55 |
import java.util.regex.Pattern; |
| 56 |
|
| 57 |
/** |
| 58 |
* Usage: [iterations=N] [size=N] [filter=REGEXP] [warmup=SECONDS] |
| 59 |
* |
| 60 |
* To run this in micro-benchmark mode, simply run as a normal java program. |
| 61 |
* Be patient; this program runs for a very long time. |
| 62 |
* For faster runs, restrict execution using command line args. |
| 63 |
* |
| 64 |
* This is an interface based version of ArrayList/IteratorMicroBenchmark |
| 65 |
* |
| 66 |
* @author Martin Buchholz |
| 67 |
*/ |
| 68 |
public class IteratorMicroBenchmark { |
| 69 |
abstract static class Job { |
| 70 |
private final String name; |
| 71 |
public Job(String name) { this.name = name; } |
| 72 |
public String name() { return name; } |
| 73 |
public abstract void work() throws Throwable; |
| 74 |
} |
| 75 |
|
| 76 |
int iterations; |
| 77 |
int size; |
| 78 |
double warmupSeconds; |
| 79 |
long warmupNanos; |
| 80 |
Pattern filter; |
| 81 |
|
| 82 |
// --------------- GC finalization infrastructure --------------- |
| 83 |
|
| 84 |
/** No guarantees, but effective in practice. */ |
| 85 |
static void forceFullGc() { |
| 86 |
CountDownLatch finalizeDone = new CountDownLatch(1); |
| 87 |
WeakReference<?> ref = new WeakReference<Object>(new Object() { |
| 88 |
protected void finalize() { finalizeDone.countDown(); }}); |
| 89 |
try { |
| 90 |
for (int i = 0; i < 10; i++) { |
| 91 |
System.gc(); |
| 92 |
if (finalizeDone.await(1L, TimeUnit.SECONDS) && ref.get() == null) { |
| 93 |
System.runFinalization(); // try to pick up stragglers |
| 94 |
return; |
| 95 |
} |
| 96 |
} |
| 97 |
} catch (InterruptedException unexpected) { |
| 98 |
throw new AssertionError("unexpected InterruptedException"); |
| 99 |
} |
| 100 |
throw new AssertionError("failed to do a \"full\" gc"); |
| 101 |
} |
| 102 |
|
| 103 |
/** |
| 104 |
* Runs each job for long enough that all the runtime compilers |
| 105 |
* have had plenty of time to warm up, i.e. get around to |
| 106 |
* compiling everything worth compiling. |
| 107 |
* Returns array of average times per job per run. |
| 108 |
*/ |
| 109 |
long[] time0(List<Job> jobs) throws Throwable { |
| 110 |
final int size = jobs.size(); |
| 111 |
long[] nanoss = new long[size]; |
| 112 |
for (int i = 0; i < size; i++) { |
| 113 |
if (warmupNanos > 0) forceFullGc(); |
| 114 |
Job job = jobs.get(i); |
| 115 |
long totalTime; |
| 116 |
int runs = 0; |
| 117 |
long startTime = System.nanoTime(); |
| 118 |
do { job.work(); runs++; } |
| 119 |
while ((totalTime = System.nanoTime() - startTime) < warmupNanos); |
| 120 |
nanoss[i] = totalTime/runs; |
| 121 |
} |
| 122 |
return nanoss; |
| 123 |
} |
| 124 |
|
| 125 |
void time(List<Job> jobs) throws Throwable { |
| 126 |
if (warmupNanos > 0) time0(jobs); // Warm up run |
| 127 |
final int size = jobs.size(); |
| 128 |
final long[] nanoss = time0(jobs); // Real timing run |
| 129 |
final long[] milliss = new long[size]; |
| 130 |
final double[] ratios = new double[size]; |
| 131 |
|
| 132 |
final String nameHeader = "Method"; |
| 133 |
final String millisHeader = "Millis"; |
| 134 |
final String ratioHeader = "Ratio"; |
| 135 |
|
| 136 |
int nameWidth = nameHeader.length(); |
| 137 |
int millisWidth = millisHeader.length(); |
| 138 |
int ratioWidth = ratioHeader.length(); |
| 139 |
|
| 140 |
for (int i = 0; i < size; i++) { |
| 141 |
nameWidth = Math.max(nameWidth, jobs.get(i).name().length()); |
| 142 |
|
| 143 |
milliss[i] = nanoss[i]/(1000L * 1000L); |
| 144 |
millisWidth = Math.max(millisWidth, |
| 145 |
String.format("%d", milliss[i]).length()); |
| 146 |
|
| 147 |
ratios[i] = (double) nanoss[i] / (double) nanoss[0]; |
| 148 |
ratioWidth = Math.max(ratioWidth, |
| 149 |
String.format("%.3f", ratios[i]).length()); |
| 150 |
} |
| 151 |
|
| 152 |
String format = String.format("%%-%ds %%%dd %%%d.3f%%n", |
| 153 |
nameWidth, millisWidth, ratioWidth); |
| 154 |
String headerFormat = String.format("%%-%ds %%%ds %%%ds%%n", |
| 155 |
nameWidth, millisWidth, ratioWidth); |
| 156 |
System.out.printf(headerFormat, "Method", "Millis", "Ratio"); |
| 157 |
|
| 158 |
// Print out absolute and relative times, calibrated against first job |
| 159 |
for (int i = 0; i < size; i++) |
| 160 |
System.out.printf(format, jobs.get(i).name(), milliss[i], ratios[i]); |
| 161 |
} |
| 162 |
|
| 163 |
private static String keywordValue(String[] args, String keyword) { |
| 164 |
for (String arg : args) |
| 165 |
if (arg.startsWith(keyword)) |
| 166 |
return arg.substring(keyword.length() + 1); |
| 167 |
return null; |
| 168 |
} |
| 169 |
|
| 170 |
private static int intArg(String[] args, String keyword, int defaultValue) { |
| 171 |
String val = keywordValue(args, keyword); |
| 172 |
return (val == null) ? defaultValue : Integer.parseInt(val); |
| 173 |
} |
| 174 |
|
| 175 |
private static double doubleArg(String[] args, String keyword, double defaultValue) { |
| 176 |
String val = keywordValue(args, keyword); |
| 177 |
return (val == null) ? defaultValue : Double.parseDouble(val); |
| 178 |
} |
| 179 |
|
| 180 |
private static Pattern patternArg(String[] args, String keyword) { |
| 181 |
String val = keywordValue(args, keyword); |
| 182 |
return (val == null) ? null : Pattern.compile(val); |
| 183 |
} |
| 184 |
|
| 185 |
private static List<Job> filter(Pattern filter, List<Job> jobs) { |
| 186 |
if (filter == null) return jobs; |
| 187 |
ArrayList<Job> newJobs = new ArrayList<>(); |
| 188 |
for (Job job : jobs) |
| 189 |
if (filter.matcher(job.name()).find()) |
| 190 |
newJobs.add(job); |
| 191 |
return newJobs; |
| 192 |
} |
| 193 |
|
| 194 |
private static void deoptimize(int sum) { |
| 195 |
if (sum == 42) |
| 196 |
System.out.println("the answer"); |
| 197 |
} |
| 198 |
|
| 199 |
private static <T> List<T> asSubList(List<T> list) { |
| 200 |
return list.subList(0, list.size()); |
| 201 |
} |
| 202 |
|
| 203 |
private static <T> Iterable<T> backwards(final List<T> list) { |
| 204 |
return new Iterable<T>() { |
| 205 |
public Iterator<T> iterator() { |
| 206 |
return new Iterator<T>() { |
| 207 |
final ListIterator<T> it = list.listIterator(list.size()); |
| 208 |
public boolean hasNext() { return it.hasPrevious(); } |
| 209 |
public T next() { return it.previous(); } |
| 210 |
public void remove() { it.remove(); }};}}; |
| 211 |
} |
| 212 |
|
| 213 |
// Checks for correctness *and* prevents loop optimizations |
| 214 |
class Check { |
| 215 |
private int sum; |
| 216 |
public void sum(int sum) { |
| 217 |
if (this.sum == 0) |
| 218 |
this.sum = sum; |
| 219 |
if (this.sum != sum) |
| 220 |
throw new AssertionError("Sum mismatch"); |
| 221 |
} |
| 222 |
} |
| 223 |
volatile Check check = new Check(); |
| 224 |
|
| 225 |
public static void main(String[] args) throws Throwable { |
| 226 |
new IteratorMicroBenchmark().run(args); |
| 227 |
} |
| 228 |
|
| 229 |
void run(String[] args) throws Throwable { |
| 230 |
iterations = intArg(args, "iterations", 10_000); |
| 231 |
size = intArg(args, "size", 1000); |
| 232 |
warmupSeconds = doubleArg(args, "warmup", 7.0); |
| 233 |
filter = patternArg(args, "filter"); |
| 234 |
|
| 235 |
warmupNanos = (long) (warmupSeconds * (1000L * 1000L * 1000L)); |
| 236 |
|
| 237 |
// System.out.printf( |
| 238 |
// "iterations=%d size=%d, warmup=%1g, filter=\"%s\"%n", |
| 239 |
// iterations, size, warmupSeconds, filter); |
| 240 |
|
| 241 |
final ArrayList<Integer> al = new ArrayList<Integer>(size); |
| 242 |
|
| 243 |
// Populate collections with random data |
| 244 |
final ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
| 245 |
for (int i = 0; i < size; i++) |
| 246 |
al.add(rnd.nextInt(size)); |
| 247 |
|
| 248 |
final ArrayDeque<Integer> ad = new ArrayDeque<>(al); |
| 249 |
final ArrayBlockingQueue<Integer> abq = new ArrayBlockingQueue<>(al.size()); |
| 250 |
abq.addAll(al); |
| 251 |
|
| 252 |
// shuffle circular array elements so they wrap |
| 253 |
for (int i = 0, n = rnd.nextInt(size); i < n; i++) { |
| 254 |
ad.addLast(ad.removeFirst()); |
| 255 |
abq.add(abq.remove()); |
| 256 |
} |
| 257 |
|
| 258 |
ArrayList<Job> jobs = new ArrayList<>(Arrays.asList()); |
| 259 |
|
| 260 |
List.of(al, ad, abq, |
| 261 |
new PriorityQueue<>(al), |
| 262 |
new Vector<>(al), |
| 263 |
new ConcurrentLinkedQueue<>(al), |
| 264 |
new ConcurrentLinkedDeque<>(al), |
| 265 |
new LinkedBlockingQueue<>(al), |
| 266 |
new LinkedBlockingDeque<>(al), |
| 267 |
new LinkedTransferQueue<>(al), |
| 268 |
new PriorityBlockingQueue<>(al)) |
| 269 |
.stream() |
| 270 |
.forEach(x -> { |
| 271 |
jobs.addAll(collectionJobs(x)); |
| 272 |
if (x instanceof Deque) |
| 273 |
jobs.addAll(dequeJobs((Deque<Integer>)x)); |
| 274 |
}); |
| 275 |
|
| 276 |
time(filter(filter, jobs)); |
| 277 |
} |
| 278 |
|
| 279 |
List<Job> collectionJobs(Collection<Integer> x) { |
| 280 |
String klazz = x.getClass().getSimpleName(); |
| 281 |
return List.of( |
| 282 |
new Job(klazz + " iterate for loop") { |
| 283 |
public void work() throws Throwable { |
| 284 |
for (int i = 0; i < iterations; i++) { |
| 285 |
int sum = 0; |
| 286 |
for (Integer n : x) |
| 287 |
sum += n; |
| 288 |
check.sum(sum);}}}, |
| 289 |
new Job(klazz + " .iterator().forEachRemaining()") { |
| 290 |
public void work() throws Throwable { |
| 291 |
int[] sum = new int[1]; |
| 292 |
for (int i = 0; i < iterations; i++) { |
| 293 |
sum[0] = 0; |
| 294 |
x.iterator().forEachRemaining(n -> sum[0] += n); |
| 295 |
check.sum(sum[0]);}}}, |
| 296 |
new Job(klazz + " .spliterator().tryAdvance()") { |
| 297 |
public void work() throws Throwable { |
| 298 |
int[] sum = new int[1]; |
| 299 |
for (int i = 0; i < iterations; i++) { |
| 300 |
sum[0] = 0; |
| 301 |
Spliterator<Integer> spliterator = x.spliterator(); |
| 302 |
do {} while (spliterator.tryAdvance(n -> sum[0] += n)); |
| 303 |
check.sum(sum[0]);}}}, |
| 304 |
new Job(klazz + " .spliterator().forEachRemaining()") { |
| 305 |
public void work() throws Throwable { |
| 306 |
int[] sum = new int[1]; |
| 307 |
for (int i = 0; i < iterations; i++) { |
| 308 |
sum[0] = 0; |
| 309 |
x.spliterator().forEachRemaining(n -> sum[0] += n); |
| 310 |
check.sum(sum[0]);}}}, |
| 311 |
new Job(klazz + " .removeIf") { |
| 312 |
public void work() throws Throwable { |
| 313 |
int[] sum = new int[1]; |
| 314 |
for (int i = 0; i < iterations; i++) { |
| 315 |
sum[0] = 0; |
| 316 |
x.removeIf(n -> { sum[0] += n; return false; }); |
| 317 |
check.sum(sum[0]);}}}, |
| 318 |
new Job(klazz + " .forEach") { |
| 319 |
public void work() throws Throwable { |
| 320 |
int[] sum = new int[1]; |
| 321 |
for (int i = 0; i < iterations; i++) { |
| 322 |
sum[0] = 0; |
| 323 |
x.forEach(n -> sum[0] += n); |
| 324 |
check.sum(sum[0]);}}}, |
| 325 |
new Job(klazz + " .toArray()") { |
| 326 |
public void work() throws Throwable { |
| 327 |
int[] sum = new int[1]; |
| 328 |
for (int i = 0; i < iterations; i++) { |
| 329 |
sum[0] = 0; |
| 330 |
for (Object o : x.toArray()) |
| 331 |
sum[0] += (Integer) o; |
| 332 |
check.sum(sum[0]);}}}, |
| 333 |
new Job(klazz + " .toArray(a)") { |
| 334 |
public void work() throws Throwable { |
| 335 |
Integer[] a = new Integer[x.size()]; |
| 336 |
int[] sum = new int[1]; |
| 337 |
for (int i = 0; i < iterations; i++) { |
| 338 |
sum[0] = 0; |
| 339 |
x.toArray(a); |
| 340 |
for (Object o : a) |
| 341 |
sum[0] += (Integer) o; |
| 342 |
check.sum(sum[0]);}}}, |
| 343 |
new Job(klazz + " .toArray(empty)") { |
| 344 |
public void work() throws Throwable { |
| 345 |
Integer[] empty = new Integer[0]; |
| 346 |
int[] sum = new int[1]; |
| 347 |
for (int i = 0; i < iterations; i++) { |
| 348 |
sum[0] = 0; |
| 349 |
for (Integer o : x.toArray(empty)) |
| 350 |
sum[0] += o; |
| 351 |
check.sum(sum[0]);}}}); |
| 352 |
} |
| 353 |
|
| 354 |
List<Job> dequeJobs(Deque<Integer> x) { |
| 355 |
String klazz = x.getClass().getSimpleName(); |
| 356 |
return List.of( |
| 357 |
new Job(klazz + " .descendingIterator() loop") { |
| 358 |
public void work() throws Throwable { |
| 359 |
for (int i = 0; i < iterations; i++) { |
| 360 |
int sum = 0; |
| 361 |
Iterator<Integer> it = x.descendingIterator(); |
| 362 |
while (it.hasNext()) |
| 363 |
sum += it.next(); |
| 364 |
check.sum(sum);}}}, |
| 365 |
new Job(klazz + " .descendingIterator().forEachRemaining()") { |
| 366 |
public void work() throws Throwable { |
| 367 |
int[] sum = new int[1]; |
| 368 |
for (int i = 0; i < iterations; i++) { |
| 369 |
sum[0] = 0; |
| 370 |
x.descendingIterator().forEachRemaining(n -> sum[0] += n); |
| 371 |
check.sum(sum[0]);}}}); |
| 372 |
} |
| 373 |
} |
