1 |
dl |
1.1 |
/* |
2 |
dl |
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 |
jsr166 |
1.7 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
dl |
1.2 |
*/ |
6 |
jsr166 |
1.15 |
|
7 |
dl |
1.2 |
/* |
8 |
jsr166 |
1.15 |
* Simple benchmark comparing various locking techniques. |
9 |
dl |
1.1 |
*/ |
10 |
|
|
|
11 |
jsr166 |
1.16 |
import java.util.concurrent.CyclicBarrier; |
12 |
|
|
import java.util.concurrent.ExecutorService; |
13 |
|
|
import java.util.concurrent.Executors; |
14 |
|
|
import java.util.concurrent.Semaphore; |
15 |
|
|
import java.util.concurrent.locks.Lock; |
16 |
|
|
import java.util.concurrent.locks.ReentrantLock; |
17 |
|
|
import java.util.concurrent.locks.ReentrantReadWriteLock; |
18 |
|
|
import java.util.concurrent.locks.StampedLock; |
19 |
dl |
1.1 |
|
20 |
|
|
public final class LockLoops { |
21 |
|
|
static final ExecutorService pool = Executors.newCachedThreadPool(); |
22 |
|
|
static final LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom(); |
23 |
|
|
static boolean print = false; |
24 |
|
|
static boolean doBuiltin = true; |
25 |
|
|
static boolean doReadWrite = true; |
26 |
|
|
static boolean doSemaphore = true; |
27 |
jsr166 |
1.12 |
static boolean doStampedLock = true; |
28 |
jsr166 |
1.8 |
static boolean doFair = true; |
29 |
dl |
1.1 |
|
30 |
|
|
public static void main(String[] args) throws Exception { |
31 |
|
|
int maxThreads = 100; |
32 |
|
|
int iters = 1000000; |
33 |
|
|
int replications = 1; |
34 |
|
|
|
35 |
jsr166 |
1.3 |
if (args.length > 0) |
36 |
dl |
1.1 |
maxThreads = Integer.parseInt(args[0]); |
37 |
|
|
|
38 |
jsr166 |
1.3 |
if (args.length > 1) |
39 |
dl |
1.1 |
iters = Integer.parseInt(args[1]); |
40 |
|
|
|
41 |
jsr166 |
1.3 |
if (args.length > 2) |
42 |
dl |
1.1 |
replications = Integer.parseInt(args[2]); |
43 |
|
|
|
44 |
|
|
rng.setSeed(3122688L); |
45 |
|
|
|
46 |
|
|
print = false; |
47 |
|
|
System.out.println("Warmup..."); |
48 |
|
|
oneTest(3, 10000); |
49 |
|
|
Thread.sleep(1000); |
50 |
|
|
oneTest(2, 10000); |
51 |
|
|
Thread.sleep(100); |
52 |
|
|
oneTest(1, 100000); |
53 |
|
|
Thread.sleep(100); |
54 |
|
|
oneTest(1, 100000); |
55 |
|
|
Thread.sleep(1000); |
56 |
|
|
print = true; |
57 |
|
|
|
58 |
|
|
for (int i = 1; i <= maxThreads; ++i) { |
59 |
|
|
for (int j = 0; j < replications; ++j) { |
60 |
|
|
System.out.println("Threads:" + i); |
61 |
|
|
oneTest(i, iters / i); |
62 |
|
|
Thread.sleep(100); |
63 |
|
|
} |
64 |
|
|
} |
65 |
|
|
pool.shutdown(); |
66 |
|
|
} |
67 |
|
|
|
68 |
|
|
static void oneTest(int nthreads, int iters) throws Exception { |
69 |
|
|
int v = rng.next(); |
70 |
|
|
|
71 |
|
|
if (print) |
72 |
|
|
System.out.print("No shared vars "); |
73 |
|
|
new NoLockLoop().test(v, nthreads, iters * 10); |
74 |
|
|
Thread.sleep(10); |
75 |
|
|
|
76 |
|
|
if (print) |
77 |
|
|
System.out.print("No Lock + volatile "); |
78 |
|
|
new NoLockVolatileLoop().test(v, nthreads, iters); |
79 |
|
|
Thread.sleep(10); |
80 |
|
|
|
81 |
|
|
if (doBuiltin) { |
82 |
|
|
if (print) |
83 |
|
|
System.out.print("builtin lock "); |
84 |
|
|
new BuiltinLockLoop().test(v, nthreads, iters); |
85 |
|
|
Thread.sleep(10); |
86 |
|
|
} |
87 |
|
|
|
88 |
|
|
if (print) |
89 |
|
|
System.out.print("ReentrantLock "); |
90 |
|
|
new ReentrantLockLoop().test(v, nthreads, iters); |
91 |
|
|
Thread.sleep(10); |
92 |
|
|
|
93 |
|
|
if (doReadWrite) { |
94 |
|
|
if (print) |
95 |
|
|
System.out.print("ReentrantWriteLock "); |
96 |
|
|
new ReentrantWriteLockLoop().test(v, nthreads, iters); |
97 |
|
|
Thread.sleep(10); |
98 |
|
|
|
99 |
|
|
if (print) |
100 |
jsr166 |
1.15 |
System.out.print("ReentrantReadLock "); |
101 |
|
|
new ReentrantReadLockLoop().test(v, nthreads, iters); |
102 |
|
|
Thread.sleep(10); |
103 |
|
|
|
104 |
|
|
if (print) |
105 |
dl |
1.1 |
System.out.print("ReentrantReadWriteLock"); |
106 |
|
|
new ReentrantReadWriteLockLoop().test(v, nthreads, iters); |
107 |
|
|
Thread.sleep(10); |
108 |
|
|
} |
109 |
|
|
|
110 |
|
|
if (doSemaphore) { |
111 |
|
|
if (print) |
112 |
|
|
System.out.print("Semaphore "); |
113 |
|
|
new SemaphoreLoop().test(v, nthreads, iters); |
114 |
|
|
Thread.sleep(10); |
115 |
|
|
|
116 |
|
|
if (print) |
117 |
|
|
System.out.print("FairSemaphore "); |
118 |
|
|
new FairSemaphoreLoop().test(v, nthreads, iters); |
119 |
|
|
Thread.sleep(10); |
120 |
|
|
} |
121 |
|
|
|
122 |
|
|
if (doFair) { |
123 |
|
|
if (print) |
124 |
|
|
System.out.print("FairReentrantLock "); |
125 |
|
|
new FairReentrantLockLoop().test(v, nthreads, iters); |
126 |
|
|
Thread.sleep(10); |
127 |
|
|
|
128 |
|
|
if (doReadWrite) { |
129 |
|
|
if (print) |
130 |
|
|
System.out.print("FairRWriteLock "); |
131 |
|
|
new FairReentrantWriteLockLoop().test(v, nthreads, iters); |
132 |
|
|
Thread.sleep(10); |
133 |
|
|
|
134 |
|
|
if (print) |
135 |
|
|
System.out.print("FairRReadWriteLock "); |
136 |
|
|
new FairReentrantReadWriteLockLoop().test(v, nthreads, iters); |
137 |
|
|
Thread.sleep(10); |
138 |
|
|
} |
139 |
|
|
} |
140 |
jsr166 |
1.12 |
|
141 |
|
|
if (doStampedLock) { |
142 |
|
|
if (print) |
143 |
|
|
System.out.print("StampedLockWrite "); |
144 |
|
|
new StampedLockWriteLoop().test(v, nthreads, iters); |
145 |
|
|
Thread.sleep(10); |
146 |
|
|
|
147 |
|
|
if (print) |
148 |
|
|
System.out.print("StampedLockRead "); |
149 |
|
|
new StampedLockReadLoop().test(v, nthreads, iters); |
150 |
|
|
Thread.sleep(10); |
151 |
jsr166 |
1.13 |
|
152 |
|
|
if (print) |
153 |
jsr166 |
1.14 |
System.out.print("StampedLockOptRead"); |
154 |
|
|
new StampedLockOptimisticReadLoop().test(v, nthreads, iters); |
155 |
|
|
Thread.sleep(10); |
156 |
|
|
|
157 |
|
|
if (print) |
158 |
jsr166 |
1.13 |
System.out.print("StampedLockReadWrite"); |
159 |
jsr166 |
1.14 |
new StampedLockReadWriteLoop().test(v, nthreads, iters); |
160 |
jsr166 |
1.13 |
Thread.sleep(10); |
161 |
jsr166 |
1.12 |
} |
162 |
dl |
1.1 |
} |
163 |
|
|
|
164 |
jsr166 |
1.6 |
abstract static class LockLoop implements Runnable { |
165 |
dl |
1.1 |
int v; |
166 |
|
|
int iters; |
167 |
|
|
volatile int result; |
168 |
|
|
final LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer(); |
169 |
|
|
CyclicBarrier barrier; |
170 |
|
|
|
171 |
|
|
final void test(int initialValue, int nthreads, int iters) throws Exception { |
172 |
|
|
v = initialValue; |
173 |
|
|
this.iters = iters; |
174 |
|
|
barrier = new CyclicBarrier(nthreads+1, timer); |
175 |
jsr166 |
1.3 |
for (int i = 0; i < nthreads; ++i) |
176 |
dl |
1.1 |
pool.execute(this); |
177 |
|
|
barrier.await(); |
178 |
|
|
barrier.await(); |
179 |
|
|
long time = timer.getTime(); |
180 |
|
|
if (print) { |
181 |
|
|
long tpi = time / (iters * nthreads); |
182 |
|
|
System.out.print("\t" + LoopHelpers.rightJustify(tpi) + " ns per update"); |
183 |
jsr166 |
1.4 |
// double secs = (double) time / 1000000000.0; |
184 |
dl |
1.1 |
// System.out.print("\t " + secs + "s run time"); |
185 |
|
|
System.out.println(); |
186 |
|
|
} |
187 |
|
|
|
188 |
|
|
if (result == 0) // avoid overoptimization |
189 |
|
|
System.out.println("useless result: " + result); |
190 |
|
|
} |
191 |
|
|
abstract int loop(int n); |
192 |
|
|
public final void run() { |
193 |
|
|
try { |
194 |
jsr166 |
1.3 |
barrier.await(); |
195 |
dl |
1.1 |
result += loop(iters); |
196 |
|
|
barrier.await(); |
197 |
|
|
} |
198 |
jsr166 |
1.3 |
catch (Exception ie) { |
199 |
|
|
return; |
200 |
dl |
1.1 |
} |
201 |
|
|
} |
202 |
|
|
|
203 |
|
|
} |
204 |
|
|
|
205 |
|
|
private static class BuiltinLockLoop extends LockLoop { |
206 |
|
|
final int loop(int n) { |
207 |
|
|
int sum = 0; |
208 |
|
|
while (n-- > 0) { |
209 |
jsr166 |
1.5 |
synchronized (this) { |
210 |
dl |
1.1 |
v = LoopHelpers.compute1(v); |
211 |
|
|
} |
212 |
|
|
sum += LoopHelpers.compute2(v); |
213 |
|
|
} |
214 |
|
|
return sum; |
215 |
|
|
} |
216 |
|
|
} |
217 |
|
|
|
218 |
|
|
private static class NoLockLoop extends LockLoop { |
219 |
|
|
final int loop(int n) { |
220 |
|
|
int sum = 0; |
221 |
|
|
int y = v; |
222 |
|
|
while (n-- > 0) { |
223 |
|
|
y = LoopHelpers.compute1(y); |
224 |
|
|
sum += LoopHelpers.compute2(y); |
225 |
|
|
} |
226 |
|
|
return sum; |
227 |
|
|
} |
228 |
|
|
} |
229 |
|
|
|
230 |
|
|
private static class NoLockVolatileLoop extends LockLoop { |
231 |
jsr166 |
1.6 |
private volatile int vv; |
232 |
dl |
1.1 |
final int loop(int n) { |
233 |
|
|
int sum = 0; |
234 |
|
|
while (n-- > 0) { |
235 |
|
|
int y = LoopHelpers.compute1(vv); |
236 |
|
|
vv = y; |
237 |
|
|
sum += LoopHelpers.compute2(y); |
238 |
|
|
} |
239 |
|
|
return sum; |
240 |
|
|
} |
241 |
|
|
} |
242 |
|
|
|
243 |
|
|
private static class ReentrantLockLoop extends LockLoop { |
244 |
jsr166 |
1.6 |
private final ReentrantLock lock = new ReentrantLock(); |
245 |
dl |
1.1 |
final int loop(int n) { |
246 |
|
|
int sum = 0; |
247 |
|
|
while (n-- > 0) { |
248 |
|
|
lock.lock(); |
249 |
|
|
try { |
250 |
|
|
v = LoopHelpers.compute1(v); |
251 |
|
|
} |
252 |
|
|
finally { |
253 |
|
|
lock.unlock(); |
254 |
|
|
} |
255 |
|
|
sum += LoopHelpers.compute2(v); |
256 |
|
|
} |
257 |
|
|
return sum; |
258 |
|
|
} |
259 |
|
|
} |
260 |
|
|
|
261 |
|
|
private static class FairReentrantLockLoop extends LockLoop { |
262 |
jsr166 |
1.6 |
private final ReentrantLock lock = new ReentrantLock(true); |
263 |
dl |
1.1 |
final int loop(int n) { |
264 |
|
|
int sum = 0; |
265 |
|
|
while (n-- > 0) { |
266 |
|
|
lock.lock(); |
267 |
|
|
try { |
268 |
|
|
v = LoopHelpers.compute1(v); |
269 |
|
|
} |
270 |
|
|
finally { |
271 |
|
|
lock.unlock(); |
272 |
|
|
} |
273 |
|
|
sum += LoopHelpers.compute2(v); |
274 |
|
|
} |
275 |
|
|
return sum; |
276 |
|
|
} |
277 |
|
|
} |
278 |
|
|
|
279 |
|
|
private static class ReentrantWriteLockLoop extends LockLoop { |
280 |
jsr166 |
1.6 |
private final Lock lock = new ReentrantReadWriteLock().writeLock(); |
281 |
dl |
1.1 |
final int loop(int n) { |
282 |
|
|
int sum = 0; |
283 |
|
|
while (n-- > 0) { |
284 |
|
|
lock.lock(); |
285 |
|
|
try { |
286 |
|
|
v = LoopHelpers.compute1(v); |
287 |
|
|
} |
288 |
|
|
finally { |
289 |
|
|
lock.unlock(); |
290 |
|
|
} |
291 |
|
|
sum += LoopHelpers.compute2(v); |
292 |
|
|
} |
293 |
|
|
return sum; |
294 |
|
|
} |
295 |
|
|
} |
296 |
|
|
|
297 |
jsr166 |
1.15 |
private static class ReentrantReadLockLoop extends LockLoop { |
298 |
|
|
private final Lock lock = new ReentrantReadWriteLock().readLock(); |
299 |
|
|
final int loop(int n) { |
300 |
|
|
int sum = 0; |
301 |
|
|
while (n-- > 0) { |
302 |
|
|
lock.lock(); |
303 |
|
|
try { |
304 |
|
|
v = LoopHelpers.compute1(v); |
305 |
|
|
} |
306 |
|
|
finally { |
307 |
|
|
lock.unlock(); |
308 |
|
|
} |
309 |
|
|
sum += LoopHelpers.compute2(v); |
310 |
|
|
} |
311 |
|
|
return sum; |
312 |
|
|
} |
313 |
|
|
} |
314 |
|
|
|
315 |
dl |
1.1 |
private static class ReentrantReadWriteLockLoop extends LockLoop { |
316 |
jsr166 |
1.6 |
private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
317 |
dl |
1.1 |
final int loop(int n) { |
318 |
|
|
int sum = 0; |
319 |
|
|
while (n-- > 0) { |
320 |
|
|
int x; |
321 |
|
|
lock.readLock().lock(); |
322 |
|
|
try { |
323 |
|
|
x = LoopHelpers.compute1(v); |
324 |
|
|
} |
325 |
|
|
finally { |
326 |
|
|
lock.readLock().unlock(); |
327 |
|
|
} |
328 |
|
|
lock.writeLock().lock(); |
329 |
|
|
try { |
330 |
|
|
v = x; |
331 |
|
|
} |
332 |
|
|
finally { |
333 |
|
|
lock.writeLock().unlock(); |
334 |
|
|
} |
335 |
|
|
sum += LoopHelpers.compute2(v); |
336 |
|
|
} |
337 |
|
|
return sum; |
338 |
|
|
} |
339 |
|
|
} |
340 |
|
|
|
341 |
|
|
private static class FairReentrantWriteLockLoop extends LockLoop { |
342 |
|
|
final Lock lock = new ReentrantReadWriteLock(true).writeLock(); |
343 |
|
|
final int loop(int n) { |
344 |
|
|
int sum = 0; |
345 |
|
|
while (n-- > 0) { |
346 |
|
|
lock.lock(); |
347 |
|
|
try { |
348 |
|
|
v = LoopHelpers.compute1(v); |
349 |
|
|
} |
350 |
|
|
finally { |
351 |
|
|
lock.unlock(); |
352 |
|
|
} |
353 |
|
|
sum += LoopHelpers.compute2(v); |
354 |
|
|
} |
355 |
|
|
return sum; |
356 |
|
|
} |
357 |
|
|
} |
358 |
|
|
|
359 |
|
|
private static class SemaphoreLoop extends LockLoop { |
360 |
jsr166 |
1.6 |
private final Semaphore sem = new Semaphore(1, false); |
361 |
dl |
1.1 |
final int loop(int n) { |
362 |
|
|
int sum = 0; |
363 |
|
|
try { |
364 |
|
|
while (n-- > 0) { |
365 |
|
|
sem.acquire(); |
366 |
|
|
try { |
367 |
|
|
v = LoopHelpers.compute1(v); |
368 |
|
|
} |
369 |
|
|
finally { |
370 |
|
|
sem.release(); |
371 |
|
|
} |
372 |
|
|
sum += LoopHelpers.compute2(v); |
373 |
|
|
} |
374 |
|
|
} |
375 |
|
|
catch (InterruptedException ie) { |
376 |
|
|
return sum; |
377 |
|
|
} |
378 |
|
|
return sum; |
379 |
|
|
} |
380 |
|
|
} |
381 |
jsr166 |
1.12 |
|
382 |
dl |
1.1 |
private static class FairSemaphoreLoop extends LockLoop { |
383 |
jsr166 |
1.6 |
private final Semaphore sem = new Semaphore(1, true); |
384 |
dl |
1.1 |
final int loop(int n) { |
385 |
|
|
int sum = 0; |
386 |
|
|
try { |
387 |
|
|
while (n-- > 0) { |
388 |
|
|
sem.acquire(); |
389 |
|
|
try { |
390 |
|
|
v = LoopHelpers.compute1(v); |
391 |
|
|
} |
392 |
|
|
finally { |
393 |
|
|
sem.release(); |
394 |
|
|
} |
395 |
|
|
sum += LoopHelpers.compute2(v); |
396 |
|
|
} |
397 |
|
|
} |
398 |
|
|
catch (InterruptedException ie) { |
399 |
|
|
return sum; |
400 |
|
|
} |
401 |
|
|
return sum; |
402 |
|
|
} |
403 |
|
|
} |
404 |
|
|
|
405 |
|
|
private static class FairReentrantReadWriteLockLoop extends LockLoop { |
406 |
jsr166 |
1.6 |
private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(true); |
407 |
dl |
1.1 |
final int loop(int n) { |
408 |
|
|
int sum = 0; |
409 |
|
|
while (n-- > 0) { |
410 |
|
|
int x; |
411 |
|
|
lock.readLock().lock(); |
412 |
|
|
try { |
413 |
|
|
x = LoopHelpers.compute1(v); |
414 |
|
|
} |
415 |
|
|
finally { |
416 |
|
|
lock.readLock().unlock(); |
417 |
|
|
} |
418 |
|
|
lock.writeLock().lock(); |
419 |
|
|
try { |
420 |
|
|
v = x; |
421 |
|
|
} |
422 |
|
|
finally { |
423 |
|
|
lock.writeLock().unlock(); |
424 |
|
|
} |
425 |
|
|
sum += LoopHelpers.compute2(v); |
426 |
|
|
} |
427 |
|
|
return sum; |
428 |
|
|
} |
429 |
|
|
} |
430 |
jsr166 |
1.12 |
|
431 |
|
|
private static class StampedLockWriteLoop extends LockLoop { |
432 |
|
|
private final StampedLock lock = new StampedLock(); |
433 |
|
|
final int loop(int n) { |
434 |
|
|
int sum = 0; |
435 |
|
|
while (n-- > 0) { |
436 |
|
|
long stamp = lock.writeLock(); |
437 |
|
|
try { |
438 |
|
|
v = LoopHelpers.compute1(v); |
439 |
|
|
} |
440 |
|
|
finally { |
441 |
|
|
lock.unlockWrite(stamp); |
442 |
|
|
} |
443 |
|
|
sum += LoopHelpers.compute2(v); |
444 |
|
|
} |
445 |
|
|
return sum; |
446 |
|
|
} |
447 |
|
|
} |
448 |
|
|
|
449 |
|
|
private static class StampedLockReadLoop extends LockLoop { |
450 |
|
|
private final StampedLock lock = new StampedLock(); |
451 |
|
|
final int loop(int n) { |
452 |
|
|
int sum = 0; |
453 |
|
|
while (n-- > 0) { |
454 |
|
|
long stamp = lock.readLock(); |
455 |
|
|
try { |
456 |
|
|
v = LoopHelpers.compute1(v); |
457 |
|
|
} |
458 |
|
|
finally { |
459 |
|
|
lock.unlockRead(stamp); |
460 |
|
|
} |
461 |
|
|
sum += LoopHelpers.compute2(v); |
462 |
|
|
} |
463 |
|
|
return sum; |
464 |
|
|
} |
465 |
|
|
} |
466 |
jsr166 |
1.13 |
|
467 |
jsr166 |
1.14 |
private static class StampedLockOptimisticReadLoop extends LockLoop { |
468 |
|
|
private final StampedLock lock = new StampedLock(); |
469 |
|
|
final int loop(int n) { |
470 |
|
|
int sum = 0; |
471 |
|
|
while (n-- > 0) { |
472 |
|
|
long stamp; |
473 |
|
|
do { |
474 |
|
|
stamp = lock.tryOptimisticRead(); |
475 |
|
|
v = LoopHelpers.compute1(v); |
476 |
|
|
} while (!lock.validate(stamp)); |
477 |
|
|
sum += LoopHelpers.compute2(v); |
478 |
|
|
} |
479 |
|
|
return sum; |
480 |
|
|
} |
481 |
|
|
} |
482 |
|
|
|
483 |
jsr166 |
1.13 |
private static class StampedLockReadWriteLoop extends LockLoop { |
484 |
|
|
private final StampedLock lock = new StampedLock(); |
485 |
|
|
final int loop(int n) { |
486 |
|
|
int sum = 0; |
487 |
|
|
while (n-- > 0) { |
488 |
|
|
int x; |
489 |
|
|
long stamp = lock.readLock(); |
490 |
|
|
try { |
491 |
|
|
x = LoopHelpers.compute1(v); |
492 |
|
|
} |
493 |
|
|
finally { |
494 |
|
|
lock.unlockRead(stamp); |
495 |
|
|
} |
496 |
|
|
stamp = lock.writeLock(); |
497 |
|
|
try { |
498 |
|
|
v = x; |
499 |
|
|
} finally { |
500 |
|
|
lock.unlockWrite(stamp); |
501 |
|
|
} |
502 |
|
|
sum += LoopHelpers.compute2(v); |
503 |
|
|
} |
504 |
|
|
return sum; |
505 |
|
|
} |
506 |
|
|
} |
507 |
dl |
1.1 |
} |