2 * Copyright 2015 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include <folly/SharedMutex.h>
22 #include <boost/optional.hpp>
23 #include <folly/Benchmark.h>
24 #include <folly/MPMCQueue.h>
25 #include <folly/Random.h>
26 #include <folly/test/DeterministicSchedule.h>
27 #include <gflags/gflags.h>
28 #include <gtest/gtest.h>
30 #include <boost/thread/shared_mutex.hpp>
31 #include <folly/RWSpinLock.h>
33 using namespace folly;
34 using namespace folly::test;
36 using namespace chrono;
38 typedef DeterministicSchedule DSched;
39 typedef SharedMutexImpl<true, void, DeterministicAtomic, true>
40 DSharedMutexReadPriority;
41 typedef SharedMutexImpl<false, void, DeterministicAtomic, true>
42 DSharedMutexWritePriority;
44 COMMON_CONCURRENCY_SHARED_MUTEX_DECLARE_STATIC_STORAGE(
45 DSharedMutexReadPriority);
46 COMMON_CONCURRENCY_SHARED_MUTEX_DECLARE_STATIC_STORAGE(
47 DSharedMutexWritePriority);
49 template <typename Lock>
52 SharedMutexToken token1;
53 SharedMutexToken token2;
54 SharedMutexToken token3;
56 EXPECT_TRUE(lock.try_lock());
57 EXPECT_FALSE(lock.try_lock());
58 EXPECT_FALSE(lock.try_lock_shared(token1));
61 EXPECT_TRUE(lock.try_lock_shared(token1));
62 EXPECT_FALSE(lock.try_lock());
63 EXPECT_TRUE(lock.try_lock_shared(token2));
64 lock.lock_shared(token3);
65 lock.unlock_shared(token3);
66 lock.unlock_shared(token2);
67 lock.unlock_shared(token1);
72 lock.lock_shared(token1);
73 lock.lock_shared(token2);
74 lock.unlock_shared(token1);
75 lock.unlock_shared(token2);
78 lock.unlock_and_lock_shared(token1);
79 lock.lock_shared(token2);
80 lock.unlock_shared(token2);
81 lock.unlock_shared(token1);
84 TEST(SharedMutex, basic) {
85 runBasicTest<SharedMutexReadPriority>();
86 runBasicTest<SharedMutexWritePriority>();
89 template <typename Lock>
90 void runBasicHoldersTest() {
92 SharedMutexToken token;
95 typename Lock::WriteHolder holder(lock);
96 EXPECT_FALSE(lock.try_lock());
97 EXPECT_FALSE(lock.try_lock_shared(token));
99 typename Lock::WriteHolder holder2(std::move(holder));
100 typename Lock::WriteHolder holder3;
101 holder3 = std::move(holder2);
103 typename Lock::UpgradeHolder holder4(std::move(holder3));
104 typename Lock::WriteHolder holder5(std::move(holder4));
106 typename Lock::ReadHolder holder6(std::move(holder5));
108 EXPECT_FALSE(lock.try_lock());
109 EXPECT_TRUE(lock.try_lock_shared(token));
110 lock.unlock_shared(token);
114 typename Lock::WriteHolder holder(lock);
115 EXPECT_FALSE(lock.try_lock());
119 typename Lock::ReadHolder holder(lock);
120 typename Lock::ReadHolder holder2(lock);
121 typename Lock::UpgradeHolder holder3(lock);
125 typename Lock::UpgradeHolder holder(lock);
126 typename Lock::ReadHolder holder2(lock);
127 typename Lock::ReadHolder holder3(std::move(holder));
131 TEST(SharedMutex, basic_holders) {
132 runBasicHoldersTest<SharedMutexReadPriority>();
133 runBasicHoldersTest<SharedMutexWritePriority>();
136 template <typename Lock>
137 void runManyReadLocksTestWithTokens() {
140 vector<SharedMutexToken> tokens;
141 for (int i = 0; i < 1000; ++i) {
142 tokens.emplace_back();
143 EXPECT_TRUE(lock.try_lock_shared(tokens.back()));
145 for (auto& token : tokens) {
146 lock.unlock_shared(token);
148 EXPECT_TRUE(lock.try_lock());
152 TEST(SharedMutex, many_read_locks_with_tokens) {
153 runManyReadLocksTestWithTokens<SharedMutexReadPriority>();
154 runManyReadLocksTestWithTokens<SharedMutexWritePriority>();
157 template <typename Lock>
158 void runManyReadLocksTestWithoutTokens() {
161 for (int i = 0; i < 1000; ++i) {
162 EXPECT_TRUE(lock.try_lock_shared());
164 for (int i = 0; i < 1000; ++i) {
165 lock.unlock_shared();
167 EXPECT_TRUE(lock.try_lock());
171 TEST(SharedMutex, many_read_locks_without_tokens) {
172 runManyReadLocksTestWithoutTokens<SharedMutexReadPriority>();
173 runManyReadLocksTestWithoutTokens<SharedMutexWritePriority>();
176 template <typename Lock>
177 void runTimeoutInPastTest() {
180 EXPECT_TRUE(lock.try_lock_for(milliseconds(0)));
182 EXPECT_TRUE(lock.try_lock_for(milliseconds(-1)));
184 EXPECT_TRUE(lock.try_lock_shared_for(milliseconds(0)));
185 lock.unlock_shared();
186 EXPECT_TRUE(lock.try_lock_shared_for(milliseconds(-1)));
187 lock.unlock_shared();
188 EXPECT_TRUE(lock.try_lock_until(system_clock::now() - milliseconds(1)));
191 lock.try_lock_shared_until(system_clock::now() - milliseconds(1)));
192 lock.unlock_shared();
193 EXPECT_TRUE(lock.try_lock_until(steady_clock::now() - milliseconds(1)));
196 lock.try_lock_shared_until(steady_clock::now() - milliseconds(1)));
197 lock.unlock_shared();
200 TEST(SharedMutex, timeout_in_past) {
201 runTimeoutInPastTest<SharedMutexReadPriority>();
202 runTimeoutInPastTest<SharedMutexWritePriority>();
205 template <class Func>
206 bool funcHasDuration(milliseconds expectedDuration, Func func) {
207 // elapsed time should eventually fall within expectedDuration +- 25%
208 for (int tries = 0; tries < 100; ++tries) {
209 auto start = steady_clock::now();
211 auto elapsed = steady_clock::now() - start;
212 if (elapsed > expectedDuration - expectedDuration / 4 &&
213 elapsed < expectedDuration + expectedDuration / 4) {
220 template <typename Lock>
221 void runFailingTryTimeoutTest() {
224 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
225 EXPECT_FALSE(lock.try_lock_for(milliseconds(10)));
227 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
228 typename Lock::Token token;
229 EXPECT_FALSE(lock.try_lock_shared_for(milliseconds(10), token));
231 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
232 EXPECT_FALSE(lock.try_lock_upgrade_for(milliseconds(10)));
234 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
235 EXPECT_FALSE(lock.try_lock_until(steady_clock::now() + milliseconds(10)));
237 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
238 typename Lock::Token token;
239 EXPECT_FALSE(lock.try_lock_shared_until(
240 steady_clock::now() + milliseconds(10), token));
242 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
244 lock.try_lock_upgrade_until(steady_clock::now() + milliseconds(10)));
246 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
247 EXPECT_FALSE(lock.try_lock_until(system_clock::now() + milliseconds(10)));
249 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
250 typename Lock::Token token;
251 EXPECT_FALSE(lock.try_lock_shared_until(
252 system_clock::now() + milliseconds(10), token));
254 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
256 lock.try_lock_upgrade_until(system_clock::now() + milliseconds(10)));
261 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
262 EXPECT_FALSE(lock.try_lock_for(milliseconds(10)));
264 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
265 EXPECT_FALSE(lock.try_lock_until(steady_clock::now() + milliseconds(10)));
267 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
268 EXPECT_FALSE(lock.try_lock_until(system_clock::now() + milliseconds(10)));
270 lock.unlock_shared();
273 for (int p = 0; p < 8; ++p) {
274 EXPECT_FALSE(lock.try_lock_for(nanoseconds(1 << p)));
278 for (int p = 0; p < 8; ++p) {
279 typename Lock::ReadHolder holder1(lock);
280 typename Lock::ReadHolder holder2(lock);
281 typename Lock::ReadHolder holder3(lock);
282 EXPECT_FALSE(lock.try_lock_for(nanoseconds(1 << p)));
286 TEST(SharedMutex, failing_try_timeout) {
287 runFailingTryTimeoutTest<SharedMutexReadPriority>();
288 runFailingTryTimeoutTest<SharedMutexWritePriority>();
291 template <typename Lock>
292 void runBasicUpgradeTest() {
294 typename Lock::Token token1;
295 typename Lock::Token token2;
298 EXPECT_FALSE(lock.try_lock());
299 EXPECT_TRUE(lock.try_lock_shared(token1));
300 lock.unlock_shared(token1);
301 lock.unlock_upgrade();
304 lock.unlock_upgrade_and_lock();
305 EXPECT_FALSE(lock.try_lock_shared(token1));
309 lock.unlock_upgrade_and_lock_shared(token1);
311 lock.unlock_upgrade_and_lock_shared(token2);
312 lock.unlock_shared(token1);
313 lock.unlock_shared(token2);
316 lock.unlock_and_lock_upgrade();
317 EXPECT_TRUE(lock.try_lock_shared(token1));
318 lock.unlock_upgrade();
319 lock.unlock_shared(token1);
322 TEST(SharedMutex, basic_upgrade_tests) {
323 runBasicUpgradeTest<SharedMutexReadPriority>();
324 runBasicUpgradeTest<SharedMutexWritePriority>();
327 TEST(SharedMutex, read_has_prio) {
328 SharedMutexReadPriority lock;
329 SharedMutexToken token1;
330 SharedMutexToken token2;
331 lock.lock_shared(token1);
332 bool exclusiveAcquired = false;
333 auto writer = thread([&] {
335 exclusiveAcquired = true;
339 // lock() can't complete until we unlock token1, but it should stake
340 // its claim with regards to other exclusive or upgrade locks. We can
341 // use try_lock_upgrade to poll for that eventuality.
342 while (lock.try_lock_upgrade()) {
343 lock.unlock_upgrade();
344 this_thread::yield();
346 EXPECT_FALSE(exclusiveAcquired);
348 // Even though lock() is stuck we should be able to get token2
349 EXPECT_TRUE(lock.try_lock_shared(token2));
350 lock.unlock_shared(token1);
351 lock.unlock_shared(token2);
353 EXPECT_TRUE(exclusiveAcquired);
356 TEST(SharedMutex, write_has_prio) {
357 SharedMutexWritePriority lock;
358 SharedMutexToken token1;
359 SharedMutexToken token2;
360 lock.lock_shared(token1);
361 auto writer = thread([&] {
366 // eventually lock() should block readers
367 while (lock.try_lock_shared(token2)) {
368 lock.unlock_shared(token2);
369 this_thread::yield();
372 lock.unlock_shared(token1);
377 SharedMutexToken token;
379 template <typename T>
384 template <typename T>
385 void unlock(T* lock) {
389 template <typename T>
390 void lock_shared(T* lock) {
391 lock->lock_shared(token);
394 template <typename T>
395 void unlock_shared(T* lock) {
396 lock->unlock_shared(token);
401 template <typename T>
406 template <typename T>
407 void unlock(T* lock) {
411 template <typename T>
412 void lock_shared(T* lock) {
416 template <typename T>
417 void unlock_shared(T* lock) {
418 lock->unlock_shared();
423 template <typename T>
428 template <typename T>
429 void unlock(T* lock) {
433 template <typename T>
434 void lock_shared(T* lock) {
438 template <typename T>
439 void unlock_shared(T* lock) {
445 pthread_rwlock_t lock_;
447 PosixRWLock() { pthread_rwlock_init(&lock_, nullptr); }
449 ~PosixRWLock() { pthread_rwlock_destroy(&lock_); }
451 void lock() { pthread_rwlock_wrlock(&lock_); }
453 void unlock() { pthread_rwlock_unlock(&lock_); }
455 void lock_shared() { pthread_rwlock_rdlock(&lock_); }
457 void unlock_shared() { pthread_rwlock_unlock(&lock_); }
461 pthread_mutex_t lock_;
463 PosixMutex() { pthread_mutex_init(&lock_, nullptr); }
465 ~PosixMutex() { pthread_mutex_destroy(&lock_); }
467 void lock() { pthread_mutex_lock(&lock_); }
469 void unlock() { pthread_mutex_unlock(&lock_); }
471 void lock_shared() { pthread_mutex_lock(&lock_); }
473 void unlock_shared() { pthread_mutex_unlock(&lock_); }
476 template <template <typename> class Atom, typename Lock, typename Locker>
477 static void runContendedReaders(size_t numOps,
479 bool useSeparateLocks) {
482 int valueProtectedByLock = 10;
484 Atom<bool> go(false);
485 Atom<bool>* goPtr = &go; // workaround for clang bug
486 vector<thread> threads(numThreads);
489 for (size_t t = 0; t < numThreads; ++t) {
490 threads[t] = DSched::thread([&, t, numThreads] {
492 Lock* lock = useSeparateLocks ? &privateLock : &globalLock;
494 while (!goPtr->load()) {
495 this_thread::yield();
497 for (size_t op = t; op < numOps; op += numThreads) {
498 locker.lock_shared(lock);
499 // note: folly::doNotOptimizeAway reads and writes to its arg,
500 // so the following two lines are very different than a call
501 // to folly::doNotOptimizeAway(valueProtectedByLock);
502 auto copy = valueProtectedByLock;
503 folly::doNotOptimizeAway(copy);
504 locker.unlock_shared(lock);
511 for (auto& thr : threads) {
516 static void folly_rwspin_reads(uint numOps,
518 bool useSeparateLocks) {
519 runContendedReaders<atomic, RWSpinLock, Locker>(
520 numOps, numThreads, useSeparateLocks);
523 static void shmtx_wr_pri_reads(uint numOps,
525 bool useSeparateLocks) {
526 runContendedReaders<atomic, SharedMutexWritePriority, TokenLocker>(
527 numOps, numThreads, useSeparateLocks);
530 static void shmtx_w_bare_reads(uint numOps,
532 bool useSeparateLocks) {
533 runContendedReaders<atomic, SharedMutexWritePriority, Locker>(
534 numOps, numThreads, useSeparateLocks);
537 static void shmtx_rd_pri_reads(uint numOps,
539 bool useSeparateLocks) {
540 runContendedReaders<atomic, SharedMutexReadPriority, TokenLocker>(
541 numOps, numThreads, useSeparateLocks);
544 static void shmtx_r_bare_reads(uint numOps,
546 bool useSeparateLocks) {
547 runContendedReaders<atomic, SharedMutexReadPriority, Locker>(
548 numOps, numThreads, useSeparateLocks);
551 static void folly_ticket_reads(uint numOps,
553 bool useSeparateLocks) {
554 runContendedReaders<atomic, RWTicketSpinLock64, Locker>(
555 numOps, numThreads, useSeparateLocks);
558 static void boost_shared_reads(uint numOps,
560 bool useSeparateLocks) {
561 runContendedReaders<atomic, boost::shared_mutex, Locker>(
562 numOps, numThreads, useSeparateLocks);
565 static void pthrd_rwlock_reads(uint numOps,
567 bool useSeparateLocks) {
568 runContendedReaders<atomic, PosixRWLock, Locker>(
569 numOps, numThreads, useSeparateLocks);
572 template <template <typename> class Atom, typename Lock, typename Locker>
573 static void runMixed(size_t numOps,
575 double writeFraction,
576 bool useSeparateLocks) {
579 int valueProtectedByLock = 0;
581 Atom<bool> go(false);
582 Atom<bool>* goPtr = &go; // workaround for clang bug
583 vector<thread> threads(numThreads);
586 for (size_t t = 0; t < numThreads; ++t) {
587 threads[t] = DSched::thread([&, t, numThreads] {
588 struct drand48_data buffer;
589 srand48_r(t, &buffer);
590 long writeThreshold = writeFraction * 0x7fffffff;
592 Lock* lock = useSeparateLocks ? &privateLock : &globalLock;
594 while (!goPtr->load()) {
595 this_thread::yield();
597 for (size_t op = t; op < numOps; op += numThreads) {
599 lrand48_r(&buffer, &randVal);
600 bool writeOp = randVal < writeThreshold;
601 SharedMutexToken token;
604 if (!useSeparateLocks) {
605 ++valueProtectedByLock;
609 locker.lock_shared(lock);
610 auto v = valueProtectedByLock;
611 folly::doNotOptimizeAway(v);
612 locker.unlock_shared(lock);
620 for (auto& thr : threads) {
625 static void folly_rwspin(size_t numOps,
627 double writeFraction,
628 bool useSeparateLocks) {
629 runMixed<atomic, RWSpinLock, Locker>(
630 numOps, numThreads, writeFraction, useSeparateLocks);
633 static void shmtx_wr_pri(uint numOps,
635 double writeFraction,
636 bool useSeparateLocks) {
637 runMixed<atomic, SharedMutexWritePriority, TokenLocker>(
638 numOps, numThreads, writeFraction, useSeparateLocks);
641 static void shmtx_w_bare(uint numOps,
643 double writeFraction,
644 bool useSeparateLocks) {
645 runMixed<atomic, SharedMutexWritePriority, Locker>(
646 numOps, numThreads, writeFraction, useSeparateLocks);
649 static void shmtx_rd_pri(uint numOps,
651 double writeFraction,
652 bool useSeparateLocks) {
653 runMixed<atomic, SharedMutexReadPriority, TokenLocker>(
654 numOps, numThreads, writeFraction, useSeparateLocks);
657 static void shmtx_r_bare(uint numOps,
659 double writeFraction,
660 bool useSeparateLocks) {
661 runMixed<atomic, SharedMutexReadPriority, Locker>(
662 numOps, numThreads, writeFraction, useSeparateLocks);
665 static void folly_ticket(size_t numOps,
667 double writeFraction,
668 bool useSeparateLocks) {
669 runMixed<atomic, RWTicketSpinLock64, Locker>(
670 numOps, numThreads, writeFraction, useSeparateLocks);
673 static void boost_shared(size_t numOps,
675 double writeFraction,
676 bool useSeparateLocks) {
677 runMixed<atomic, boost::shared_mutex, Locker>(
678 numOps, numThreads, writeFraction, useSeparateLocks);
681 static void pthrd_rwlock(size_t numOps,
683 double writeFraction,
684 bool useSeparateLocks) {
685 runMixed<atomic, PosixRWLock, Locker>(
686 numOps, numThreads, writeFraction, useSeparateLocks);
689 static void pthrd_mutex_(size_t numOps,
691 double writeFraction,
692 bool useSeparateLocks) {
693 runMixed<atomic, PosixMutex, Locker>(
694 numOps, numThreads, writeFraction, useSeparateLocks);
697 template <typename Lock, template <typename> class Atom>
698 static void runAllAndValidate(size_t numOps, size_t numThreads) {
700 Atom<int> globalExclusiveCount(0);
701 Atom<int> globalUpgradeCount(0);
702 Atom<int> globalSharedCount(0);
704 Atom<bool> go(false);
706 // clang crashes on access to Atom<> captured by ref in closure
707 Atom<int>* globalExclusiveCountPtr = &globalExclusiveCount;
708 Atom<int>* globalUpgradeCountPtr = &globalUpgradeCount;
709 Atom<int>* globalSharedCountPtr = &globalSharedCount;
710 Atom<bool>* goPtr = &go;
712 vector<thread> threads(numThreads);
715 for (size_t t = 0; t < numThreads; ++t) {
716 threads[t] = DSched::thread([&, t, numThreads] {
717 struct drand48_data buffer;
718 srand48_r(t, &buffer);
720 bool exclusive = false;
721 bool upgrade = false;
723 bool ourGlobalTokenUsed = false;
724 SharedMutexToken ourGlobalToken;
727 vector<SharedMutexToken> privateTokens;
729 while (!goPtr->load()) {
730 this_thread::yield();
732 for (size_t op = t; op < numOps; op += numThreads) {
733 // randVal in [0,1000)
735 lrand48_r(&buffer, &randVal);
736 randVal = (long)((randVal * (uint64_t)1000) / 0x7fffffff);
738 // make as many assertions as possible about the global state
740 EXPECT_EQ(1, globalExclusiveCountPtr->load(memory_order_acquire));
741 EXPECT_EQ(0, globalUpgradeCountPtr->load(memory_order_acquire));
742 EXPECT_EQ(0, globalSharedCountPtr->load(memory_order_acquire));
745 EXPECT_EQ(0, globalExclusiveCountPtr->load(memory_order_acquire));
746 EXPECT_EQ(1, globalUpgradeCountPtr->load(memory_order_acquire));
749 EXPECT_EQ(0, globalExclusiveCountPtr->load(memory_order_acquire));
750 EXPECT_TRUE(globalSharedCountPtr->load(memory_order_acquire) > 0);
752 EXPECT_FALSE(ourGlobalTokenUsed);
755 // independent 20% chance we do something to the private lock
757 // it's okay to take multiple private shared locks because
758 // we never take an exclusive lock, so reader versus writer
759 // priority doesn't cause deadlocks
760 if (randVal < 100 && privateTokens.size() > 0) {
761 auto i = randVal % privateTokens.size();
762 privateLock.unlock_shared(privateTokens[i]);
763 privateTokens.erase(privateTokens.begin() + i);
765 SharedMutexToken token;
766 privateLock.lock_shared(token);
767 privateTokens.push_back(token);
772 // if we've got a lock, the only thing we can do is release it
773 // or transform it into a different kind of lock
776 --*globalExclusiveCountPtr;
779 } else if (randVal < 700) {
780 globalLock.unlock_and_lock_shared();
781 ++*globalSharedCountPtr;
783 } else if (randVal < 900) {
784 globalLock.unlock_and_lock_shared(ourGlobalToken);
785 ++*globalSharedCountPtr;
787 ourGlobalTokenUsed = true;
789 globalLock.unlock_and_lock_upgrade();
790 ++*globalUpgradeCountPtr;
793 } else if (upgrade) {
795 --*globalUpgradeCountPtr;
797 globalLock.unlock_upgrade();
798 } else if (randVal < 700) {
799 globalLock.unlock_upgrade_and_lock_shared();
800 ++*globalSharedCountPtr;
802 } else if (randVal < 900) {
803 globalLock.unlock_upgrade_and_lock_shared(ourGlobalToken);
804 ++*globalSharedCountPtr;
806 ourGlobalTokenUsed = true;
808 globalLock.unlock_upgrade_and_lock();
809 ++*globalExclusiveCountPtr;
814 --*globalSharedCountPtr;
815 if (ourGlobalTokenUsed) {
816 globalLock.unlock_shared(ourGlobalToken);
817 ourGlobalTokenUsed = false;
819 globalLock.unlock_shared();
821 } else if (randVal < 400) {
822 // 40% chance of shared lock with token, 5 ways to get it
824 // delta t goes from -1 millis to 7 millis
825 auto dt = microseconds(10 * (randVal - 100));
828 globalLock.lock_shared(ourGlobalToken);
830 } else if (randVal < 500) {
831 shared = globalLock.try_lock_shared(ourGlobalToken);
832 } else if (randVal < 600) {
833 shared = globalLock.try_lock_shared_for(dt, ourGlobalToken);
834 } else if (randVal < 800) {
835 shared = globalLock.try_lock_shared_until(
836 system_clock::now() + dt, ourGlobalToken);
839 ourGlobalTokenUsed = true;
840 ++*globalSharedCountPtr;
842 } else if (randVal < 800) {
843 // 40% chance of shared lock without token
844 auto dt = microseconds(10 * (randVal - 100));
846 globalLock.lock_shared();
848 } else if (randVal < 500) {
849 shared = globalLock.try_lock_shared();
850 } else if (randVal < 600) {
851 shared = globalLock.try_lock_shared_for(dt);
852 } else if (randVal < 800) {
853 shared = globalLock.try_lock_shared_until(
854 system_clock::now() + dt);
857 ++*globalSharedCountPtr;
859 } else if (randVal < 900) {
860 // 10% change of upgrade lock
861 globalLock.lock_upgrade();
863 ++*globalUpgradeCountPtr;
865 // 10% chance of exclusive lock, 5 ways to get it
867 // delta t goes from -1 millis to 9 millis
868 auto dt = microseconds(100 * (randVal - 910));
873 } else if (randVal < 500) {
874 exclusive = globalLock.try_lock();
875 } else if (randVal < 600) {
876 exclusive = globalLock.try_lock_for(dt);
877 } else if (randVal < 700) {
878 exclusive = globalLock.try_lock_until(steady_clock::now() + dt);
880 exclusive = globalLock.try_lock_until(system_clock::now() + dt);
883 ++*globalExclusiveCountPtr;
889 --*globalExclusiveCountPtr;
893 --*globalUpgradeCountPtr;
894 globalLock.unlock_upgrade();
897 --*globalSharedCountPtr;
898 if (ourGlobalTokenUsed) {
899 globalLock.unlock_shared(ourGlobalToken);
900 ourGlobalTokenUsed = false;
902 globalLock.unlock_shared();
905 for (auto& token : privateTokens) {
906 privateLock.unlock_shared(token);
913 for (auto& thr : threads) {
918 TEST(SharedMutex, deterministic_concurrent_readers_of_one_lock_read_prio) {
919 for (int pass = 0; pass < 3; ++pass) {
920 DSched sched(DSched::uniform(pass));
921 runContendedReaders<DeterministicAtomic,
922 DSharedMutexReadPriority,
923 Locker>(1000, 3, false);
927 TEST(SharedMutex, deterministic_concurrent_readers_of_one_lock_write_prio) {
928 for (int pass = 0; pass < 3; ++pass) {
929 DSched sched(DSched::uniform(pass));
930 runContendedReaders<DeterministicAtomic,
931 DSharedMutexWritePriority,
932 Locker>(1000, 3, false);
936 TEST(SharedMutex, concurrent_readers_of_one_lock_read_prio) {
937 for (int pass = 0; pass < 10; ++pass) {
938 runContendedReaders<atomic, SharedMutexReadPriority, Locker>(
943 TEST(SharedMutex, concurrent_readers_of_one_lock_write_prio) {
944 for (int pass = 0; pass < 10; ++pass) {
945 runContendedReaders<atomic, SharedMutexWritePriority, Locker>(
950 TEST(SharedMutex, deterministic_readers_of_concurrent_locks_read_prio) {
951 for (int pass = 0; pass < 3; ++pass) {
952 DSched sched(DSched::uniform(pass));
953 runContendedReaders<DeterministicAtomic,
954 DSharedMutexReadPriority,
955 Locker>(1000, 3, true);
959 TEST(SharedMutex, deterministic_readers_of_concurrent_locks_write_prio) {
960 for (int pass = 0; pass < 3; ++pass) {
961 DSched sched(DSched::uniform(pass));
962 runContendedReaders<DeterministicAtomic,
963 DSharedMutexWritePriority,
964 Locker>(1000, 3, true);
968 TEST(SharedMutex, readers_of_concurrent_locks_read_prio) {
969 for (int pass = 0; pass < 10; ++pass) {
970 runContendedReaders<atomic, SharedMutexReadPriority, TokenLocker>(
975 TEST(SharedMutex, readers_of_concurrent_locks_write_prio) {
976 for (int pass = 0; pass < 10; ++pass) {
977 runContendedReaders<atomic, SharedMutexWritePriority, TokenLocker>(
982 TEST(SharedMutex, deterministic_mixed_mostly_read_read_prio) {
983 for (int pass = 0; pass < 3; ++pass) {
984 DSched sched(DSched::uniform(pass));
985 runMixed<DeterministicAtomic, DSharedMutexReadPriority, Locker>(
986 1000, 3, 0.1, false);
990 TEST(SharedMutex, deterministic_mixed_mostly_read_write_prio) {
991 for (int pass = 0; pass < 3; ++pass) {
992 DSched sched(DSched::uniform(pass));
993 runMixed<DeterministicAtomic, DSharedMutexWritePriority, Locker>(
994 1000, 3, 0.1, false);
998 TEST(SharedMutex, mixed_mostly_read_read_prio) {
999 for (int pass = 0; pass < 5; ++pass) {
1000 runMixed<atomic, SharedMutexReadPriority, TokenLocker>(
1001 50000, 32, 0.1, false);
1005 TEST(SharedMutex, mixed_mostly_read_write_prio) {
1006 for (int pass = 0; pass < 5; ++pass) {
1007 runMixed<atomic, SharedMutexWritePriority, TokenLocker>(
1008 50000, 32, 0.1, false);
1012 TEST(SharedMutex, deterministic_mixed_mostly_write_read_prio) {
1013 for (int pass = 0; pass < 1; ++pass) {
1014 DSched sched(DSched::uniform(pass));
1015 runMixed<DeterministicAtomic, DSharedMutexReadPriority, TokenLocker>(
1016 1000, 10, 0.9, false);
1020 TEST(SharedMutex, deterministic_mixed_mostly_write_write_prio) {
1021 for (int pass = 0; pass < 1; ++pass) {
1022 DSched sched(DSched::uniform(pass));
1023 runMixed<DeterministicAtomic, DSharedMutexWritePriority, TokenLocker>(
1024 1000, 10, 0.9, false);
1028 TEST(SharedMutex, deterministic_lost_wakeup_write_prio) {
1029 for (int pass = 0; pass < 10; ++pass) {
1030 DSched sched(DSched::uniformSubset(pass, 2, 200));
1031 runMixed<DeterministicAtomic, DSharedMutexWritePriority, TokenLocker>(
1032 1000, 3, 1.0, false);
1036 TEST(SharedMutex, mixed_mostly_write_read_prio) {
1037 for (int pass = 0; pass < 5; ++pass) {
1038 runMixed<atomic, SharedMutexReadPriority, TokenLocker>(
1039 50000, 300, 0.9, false);
1043 TEST(SharedMutex, mixed_mostly_write_write_prio) {
1044 for (int pass = 0; pass < 5; ++pass) {
1045 runMixed<atomic, SharedMutexWritePriority, TokenLocker>(
1046 50000, 300, 0.9, false);
1050 TEST(SharedMutex, deterministic_all_ops_read_prio) {
1051 for (int pass = 0; pass < 5; ++pass) {
1052 DSched sched(DSched::uniform(pass));
1053 runAllAndValidate<DSharedMutexReadPriority, DeterministicAtomic>(1000, 8);
1057 TEST(SharedMutex, deterministic_all_ops_write_prio) {
1058 for (int pass = 0; pass < 5; ++pass) {
1059 DSched sched(DSched::uniform(pass));
1060 runAllAndValidate<DSharedMutexWritePriority, DeterministicAtomic>(1000, 8);
1064 TEST(SharedMutex, all_ops_read_prio) {
1065 for (int pass = 0; pass < 5; ++pass) {
1066 runAllAndValidate<SharedMutexReadPriority, atomic>(100000, 32);
1070 TEST(SharedMutex, all_ops_write_prio) {
1071 for (int pass = 0; pass < 5; ++pass) {
1072 runAllAndValidate<SharedMutexWritePriority, atomic>(100000, 32);
1076 FOLLY_ASSUME_FBVECTOR_COMPATIBLE(
1077 boost::optional<boost::optional<SharedMutexToken>>)
1079 // Setup is a set of threads that either grab a shared lock, or exclusive
1080 // and then downgrade it, or upgrade then upgrade and downgrade, then
1081 // enqueue the shared lock to a second set of threads that just performs
1082 // unlocks. Half of the shared locks use tokens, the others don't.
1083 template <typename Lock, template <typename> class Atom>
1084 static void runRemoteUnlock(size_t numOps,
1085 double preWriteFraction,
1086 double preUpgradeFraction,
1087 size_t numSendingThreads,
1088 size_t numReceivingThreads) {
1090 MPMCQueue<boost::optional<boost::optional<SharedMutexToken>>, Atom>
1092 auto queuePtr = &queue; // workaround for clang crash
1094 Atom<bool> go(false);
1095 auto goPtr = &go; // workaround for clang crash
1096 Atom<int> pendingSenders(numSendingThreads);
1097 auto pendingSendersPtr = &pendingSenders; // workaround for clang crash
1098 vector<thread> threads(numSendingThreads + numReceivingThreads);
1101 for (size_t t = 0; t < threads.size(); ++t) {
1102 threads[t] = DSched::thread([&, t, numSendingThreads] {
1103 if (t >= numSendingThreads) {
1105 typename decltype(queue)::value_type elem;
1107 queuePtr->blockingRead(elem);
1109 // EOF, pass the EOF token
1110 queuePtr->blockingWrite(std::move(elem));
1114 globalLock.unlock_shared(**elem);
1116 globalLock.unlock_shared();
1121 // else we're a sender
1123 struct drand48_data buffer;
1124 srand48_r(t, &buffer);
1126 while (!goPtr->load()) {
1127 this_thread::yield();
1129 for (size_t op = t; op < numOps; op += numSendingThreads) {
1130 long unscaledRandVal;
1131 lrand48_r(&buffer, &unscaledRandVal);
1134 double randVal = ((double)unscaledRandVal) / 0x7fffffff;
1136 // extract a bit and rescale
1137 bool useToken = randVal >= 0.5;
1138 randVal = (randVal - (useToken ? 0.5 : 0.0)) * 2;
1140 boost::optional<SharedMutexToken> maybeToken;
1143 SharedMutexToken token;
1144 if (randVal < preWriteFraction) {
1146 globalLock.unlock_and_lock_shared(token);
1147 } else if (randVal < preWriteFraction + preUpgradeFraction / 2) {
1148 globalLock.lock_upgrade();
1149 globalLock.unlock_upgrade_and_lock_shared(token);
1150 } else if (randVal < preWriteFraction + preUpgradeFraction) {
1151 globalLock.lock_upgrade();
1152 globalLock.unlock_upgrade_and_lock();
1153 globalLock.unlock_and_lock_shared(token);
1155 globalLock.lock_shared(token);
1159 if (randVal < preWriteFraction) {
1161 globalLock.unlock_and_lock_shared();
1162 } else if (randVal < preWriteFraction + preUpgradeFraction / 2) {
1163 globalLock.lock_upgrade();
1164 globalLock.unlock_upgrade_and_lock_shared();
1165 } else if (randVal < preWriteFraction + preUpgradeFraction) {
1166 globalLock.lock_upgrade();
1167 globalLock.unlock_upgrade_and_lock();
1168 globalLock.unlock_and_lock_shared();
1170 globalLock.lock_shared();
1174 // blockingWrite is emplace-like, so this automatically adds
1175 // another level of wrapping
1176 queuePtr->blockingWrite(maybeToken);
1178 if (--*pendingSendersPtr == 0) {
1179 queuePtr->blockingWrite(boost::none);
1186 for (auto& thr : threads) {
1191 TEST(SharedMutex, deterministic_remote_write_prio) {
1192 for (int pass = 0; pass < 1; ++pass) {
1193 DSched sched(DSched::uniform(pass));
1194 runRemoteUnlock<DSharedMutexWritePriority, DeterministicAtomic>(
1195 500, 0.1, 0.1, 5, 5);
1199 TEST(SharedMutex, deterministic_remote_read_prio) {
1200 for (int pass = 0; pass < 1; ++pass) {
1201 DSched sched(DSched::uniform(pass));
1202 runRemoteUnlock<DSharedMutexReadPriority, DeterministicAtomic>(
1203 500, 0.1, 0.1, 5, 5);
1207 TEST(SharedMutex, remote_write_prio) {
1208 for (int pass = 0; pass < 10; ++pass) {
1209 runRemoteUnlock<SharedMutexWritePriority, atomic>(100000, 0.1, 0.1, 5, 5);
1213 TEST(SharedMutex, remote_read_prio) {
1214 for (int pass = 0; pass < 100; ++pass) {
1215 runRemoteUnlock<SharedMutexReadPriority, atomic>(100000, 0.1, 0.1, 5, 5);
1219 static void burn(size_t n) {
1220 for (size_t i = 0; i < n; ++i) {
1221 folly::doNotOptimizeAway(i);
1225 // Two threads and three locks, arranged so that they have to proceed
1226 // in turn with reader/writer conflict
1227 template <typename Lock, template <typename> class Atom = atomic>
1228 static void runPingPong(size_t numRounds, size_t burnCount) {
1230 pair<Lock, char[56]> locks[3];
1234 auto availPtr = &avail; // workaround for clang crash
1235 Atom<bool> go(false);
1236 auto goPtr = &go; // workaround for clang crash
1237 vector<thread> threads(2);
1239 locks[0].first.lock();
1240 locks[1].first.lock();
1241 locks[2].first.lock_shared();
1244 threads[0] = DSched::thread([&] {
1246 while (!goPtr->load()) {
1247 this_thread::yield();
1249 for (size_t i = 0; i < numRounds; ++i) {
1250 locks[i % 3].first.unlock();
1251 locks[(i + 2) % 3].first.lock();
1255 threads[1] = DSched::thread([&] {
1257 while (!goPtr->load()) {
1258 this_thread::yield();
1260 for (size_t i = 0; i < numRounds; ++i) {
1261 locks[i % 3].first.lock_shared();
1263 locks[(i + 2) % 3].first.unlock_shared();
1267 while (avail.load() < 2) {
1268 this_thread::yield();
1273 for (auto& thr : threads) {
1276 locks[numRounds % 3].first.unlock();
1277 locks[(numRounds + 1) % 3].first.unlock();
1278 locks[(numRounds + 2) % 3].first.unlock_shared();
1281 static void folly_rwspin_ping_pong(size_t n, size_t scale, size_t burnCount) {
1282 runPingPong<RWSpinLock>(n / scale, burnCount);
1285 static void shmtx_w_bare_ping_pong(size_t n, size_t scale, size_t burnCount) {
1286 runPingPong<SharedMutexWritePriority>(n / scale, burnCount);
1289 static void shmtx_r_bare_ping_pong(size_t n, size_t scale, size_t burnCount) {
1290 runPingPong<SharedMutexReadPriority>(n / scale, burnCount);
1293 static void folly_ticket_ping_pong(size_t n, size_t scale, size_t burnCount) {
1294 runPingPong<RWTicketSpinLock64>(n / scale, burnCount);
1297 static void boost_shared_ping_pong(size_t n, size_t scale, size_t burnCount) {
1298 runPingPong<boost::shared_mutex>(n / scale, burnCount);
1301 static void pthrd_rwlock_ping_pong(size_t n, size_t scale, size_t burnCount) {
1302 runPingPong<PosixRWLock>(n / scale, burnCount);
1305 TEST(SharedMutex, deterministic_ping_pong_write_prio) {
1306 for (int pass = 0; pass < 1; ++pass) {
1307 DSched sched(DSched::uniform(pass));
1308 runPingPong<DSharedMutexWritePriority, DeterministicAtomic>(500, 0);
1312 TEST(SharedMutex, deterministic_ping_pong_read_prio) {
1313 for (int pass = 0; pass < 1; ++pass) {
1314 DSched sched(DSched::uniform(pass));
1315 runPingPong<DSharedMutexReadPriority, DeterministicAtomic>(500, 0);
1319 TEST(SharedMutex, ping_pong_write_prio) {
1320 for (int pass = 0; pass < 1; ++pass) {
1321 runPingPong<SharedMutexWritePriority, atomic>(50000, 0);
1325 TEST(SharedMutex, ping_pong_read_prio) {
1326 for (int pass = 0; pass < 1; ++pass) {
1327 runPingPong<SharedMutexReadPriority, atomic>(50000, 0);
1331 // This is here so you can tell how much of the runtime reported by the
1332 // more complex harnesses is due to the harness, although due to the
1333 // magic of compiler optimization it may also be slower
1334 BENCHMARK(single_thread_lock_shared_unlock_shared, iters) {
1336 for (size_t n = 0; n < iters; ++n) {
1337 SharedMutex::Token token;
1338 lock.lock_shared(token);
1339 folly::doNotOptimizeAway(0);
1340 lock.unlock_shared(token);
1344 BENCHMARK(single_thread_lock_unlock, iters) {
1346 for (size_t n = 0; n < iters; ++n) {
1348 folly::doNotOptimizeAway(0);
1353 #define BENCH_BASE(args...) BENCHMARK_NAMED_PARAM(args)
1354 #define BENCH_REL(args...) BENCHMARK_RELATIVE_NAMED_PARAM(args)
1356 // 100% reads. Best-case scenario for deferred locks. Lock is colocated
1357 // with read data, so inline lock takes cache miss every time but deferred
1358 // lock has only cache hits and local access.
1359 BENCHMARK_DRAW_LINE()
1360 BENCHMARK_DRAW_LINE()
1361 BENCH_BASE(folly_rwspin_reads, 1thread, 1, false)
1362 BENCH_REL (shmtx_wr_pri_reads, 1thread, 1, false)
1363 BENCH_REL (shmtx_w_bare_reads, 1thread, 1, false)
1364 BENCH_REL (shmtx_rd_pri_reads, 1thread, 1, false)
1365 BENCH_REL (shmtx_r_bare_reads, 1thread, 1, false)
1366 BENCH_REL (folly_ticket_reads, 1thread, 1, false)
1367 BENCH_REL (boost_shared_reads, 1thread, 1, false)
1368 BENCH_REL (pthrd_rwlock_reads, 1thread, 1, false)
1369 BENCHMARK_DRAW_LINE()
1370 BENCH_BASE(folly_rwspin_reads, 2thread, 2, false)
1371 BENCH_REL (shmtx_wr_pri_reads, 2thread, 2, false)
1372 BENCH_REL (shmtx_w_bare_reads, 2thread, 2, false)
1373 BENCH_REL (shmtx_rd_pri_reads, 2thread, 2, false)
1374 BENCH_REL (shmtx_r_bare_reads, 2thread, 2, false)
1375 BENCH_REL (folly_ticket_reads, 2thread, 2, false)
1376 BENCH_REL (boost_shared_reads, 2thread, 2, false)
1377 BENCH_REL (pthrd_rwlock_reads, 2thread, 2, false)
1378 BENCHMARK_DRAW_LINE()
1379 BENCH_BASE(folly_rwspin_reads, 4thread, 4, false)
1380 BENCH_REL (shmtx_wr_pri_reads, 4thread, 4, false)
1381 BENCH_REL (shmtx_w_bare_reads, 4thread, 4, false)
1382 BENCH_REL (shmtx_rd_pri_reads, 4thread, 4, false)
1383 BENCH_REL (shmtx_r_bare_reads, 4thread, 4, false)
1384 BENCH_REL (folly_ticket_reads, 4thread, 4, false)
1385 BENCH_REL (boost_shared_reads, 4thread, 4, false)
1386 BENCH_REL (pthrd_rwlock_reads, 4thread, 4, false)
1387 BENCHMARK_DRAW_LINE()
1388 BENCH_BASE(folly_rwspin_reads, 8thread, 8, false)
1389 BENCH_REL (shmtx_wr_pri_reads, 8thread, 8, false)
1390 BENCH_REL (shmtx_w_bare_reads, 8thread, 8, false)
1391 BENCH_REL (shmtx_rd_pri_reads, 8thread, 8, false)
1392 BENCH_REL (shmtx_r_bare_reads, 8thread, 8, false)
1393 BENCH_REL (folly_ticket_reads, 8thread, 8, false)
1394 BENCH_REL (boost_shared_reads, 8thread, 8, false)
1395 BENCH_REL (pthrd_rwlock_reads, 8thread, 8, false)
1396 BENCHMARK_DRAW_LINE()
1397 BENCH_BASE(folly_rwspin_reads, 16thread, 16, false)
1398 BENCH_REL (shmtx_wr_pri_reads, 16thread, 16, false)
1399 BENCH_REL (shmtx_w_bare_reads, 16thread, 16, false)
1400 BENCH_REL (shmtx_rd_pri_reads, 16thread, 16, false)
1401 BENCH_REL (shmtx_r_bare_reads, 16thread, 16, false)
1402 BENCH_REL (folly_ticket_reads, 16thread, 16, false)
1403 BENCH_REL (boost_shared_reads, 16thread, 16, false)
1404 BENCH_REL (pthrd_rwlock_reads, 16thread, 16, false)
1405 BENCHMARK_DRAW_LINE()
1406 BENCH_BASE(folly_rwspin_reads, 32thread, 32, false)
1407 BENCH_REL (shmtx_wr_pri_reads, 32thread, 32, false)
1408 BENCH_REL (shmtx_w_bare_reads, 32thread, 32, false)
1409 BENCH_REL (shmtx_rd_pri_reads, 32thread, 32, false)
1410 BENCH_REL (shmtx_r_bare_reads, 32thread, 32, false)
1411 BENCH_REL (folly_ticket_reads, 32thread, 32, false)
1412 BENCH_REL (boost_shared_reads, 32thread, 32, false)
1413 BENCH_REL (pthrd_rwlock_reads, 32thread, 32, false)
1414 BENCHMARK_DRAW_LINE()
1415 BENCH_BASE(folly_rwspin_reads, 64thread, 64, false)
1416 BENCH_REL (shmtx_wr_pri_reads, 64thread, 64, false)
1417 BENCH_REL (shmtx_w_bare_reads, 64thread, 64, false)
1418 BENCH_REL (shmtx_rd_pri_reads, 64thread, 64, false)
1419 BENCH_REL (shmtx_r_bare_reads, 64thread, 64, false)
1420 BENCH_REL (folly_ticket_reads, 64thread, 64, false)
1421 BENCH_REL (boost_shared_reads, 64thread, 64, false)
1422 BENCH_REL (pthrd_rwlock_reads, 64thread, 64, false)
1424 // 1 lock used by everybody, 100% writes. Threads only hurt, but it is
1425 // good to not fail catastrophically. Compare to single_thread_lock_unlock
1426 // to see the overhead of the generic driver (and its pseudo-random number
1427 // generator). pthrd_mutex_ is a pthread_mutex_t (default, not adaptive),
1428 // which is better than any of the reader-writer locks for this scenario.
1429 BENCHMARK_DRAW_LINE()
1430 BENCHMARK_DRAW_LINE()
1431 BENCH_BASE(folly_rwspin, 1thread_all_write, 1, 1.0, false)
1432 BENCH_REL (shmtx_wr_pri, 1thread_all_write, 1, 1.0, false)
1433 BENCH_REL (shmtx_rd_pri, 1thread_all_write, 1, 1.0, false)
1434 BENCH_REL (folly_ticket, 1thread_all_write, 1, 1.0, false)
1435 BENCH_REL (boost_shared, 1thread_all_write, 1, 1.0, false)
1436 BENCH_REL (pthrd_rwlock, 1thread_all_write, 1, 1.0, false)
1437 BENCH_REL (pthrd_mutex_, 1thread_all_write, 1, 1.0, false)
1438 BENCHMARK_DRAW_LINE()
1439 BENCH_BASE(folly_rwspin, 2thread_all_write, 2, 1.0, false)
1440 BENCH_REL (shmtx_wr_pri, 2thread_all_write, 2, 1.0, false)
1441 BENCH_REL (shmtx_rd_pri, 2thread_all_write, 2, 1.0, false)
1442 BENCH_REL (folly_ticket, 2thread_all_write, 2, 1.0, false)
1443 BENCH_REL (boost_shared, 2thread_all_write, 2, 1.0, false)
1444 BENCH_REL (pthrd_rwlock, 2thread_all_write, 2, 1.0, false)
1445 BENCH_REL (pthrd_mutex_, 2thread_all_write, 2, 1.0, false)
1446 BENCHMARK_DRAW_LINE()
1447 BENCH_BASE(folly_rwspin, 4thread_all_write, 4, 1.0, false)
1448 BENCH_REL (shmtx_wr_pri, 4thread_all_write, 4, 1.0, false)
1449 BENCH_REL (shmtx_rd_pri, 4thread_all_write, 4, 1.0, false)
1450 BENCH_REL (folly_ticket, 4thread_all_write, 4, 1.0, false)
1451 BENCH_REL (boost_shared, 4thread_all_write, 4, 1.0, false)
1452 BENCH_REL (pthrd_rwlock, 4thread_all_write, 4, 1.0, false)
1453 BENCH_REL (pthrd_mutex_, 4thread_all_write, 4, 1.0, false)
1454 BENCHMARK_DRAW_LINE()
1455 BENCH_BASE(folly_rwspin, 8thread_all_write, 8, 1.0, false)
1456 BENCH_REL (shmtx_wr_pri, 8thread_all_write, 8, 1.0, false)
1457 BENCH_REL (shmtx_rd_pri, 8thread_all_write, 8, 1.0, false)
1458 BENCH_REL (folly_ticket, 8thread_all_write, 8, 1.0, false)
1459 BENCH_REL (boost_shared, 8thread_all_write, 8, 1.0, false)
1460 BENCH_REL (pthrd_rwlock, 8thread_all_write, 8, 1.0, false)
1461 BENCH_REL (pthrd_mutex_, 8thread_all_write, 8, 1.0, false)
1462 BENCHMARK_DRAW_LINE()
1463 BENCH_BASE(folly_rwspin, 16thread_all_write, 16, 1.0, false)
1464 BENCH_REL (shmtx_wr_pri, 16thread_all_write, 16, 1.0, false)
1465 BENCH_REL (shmtx_rd_pri, 16thread_all_write, 16, 1.0, false)
1466 BENCH_REL (folly_ticket, 16thread_all_write, 16, 1.0, false)
1467 BENCH_REL (boost_shared, 16thread_all_write, 16, 1.0, false)
1468 BENCH_REL (pthrd_rwlock, 16thread_all_write, 16, 1.0, false)
1469 BENCH_REL (pthrd_mutex_, 16thread_all_write, 16, 1.0, false)
1470 BENCHMARK_DRAW_LINE()
1471 BENCH_BASE(folly_rwspin, 32thread_all_write, 32, 1.0, false)
1472 BENCH_REL (shmtx_wr_pri, 32thread_all_write, 32, 1.0, false)
1473 BENCH_REL (shmtx_rd_pri, 32thread_all_write, 32, 1.0, false)
1474 BENCH_REL (folly_ticket, 32thread_all_write, 32, 1.0, false)
1475 BENCH_REL (boost_shared, 32thread_all_write, 32, 1.0, false)
1476 BENCH_REL (pthrd_rwlock, 32thread_all_write, 32, 1.0, false)
1477 BENCH_REL (pthrd_mutex_, 32thread_all_write, 32, 1.0, false)
1478 BENCHMARK_DRAW_LINE()
1479 BENCH_BASE(folly_rwspin, 64thread_all_write, 64, 1.0, false)
1480 BENCH_REL (shmtx_wr_pri, 64thread_all_write, 64, 1.0, false)
1481 BENCH_REL (shmtx_rd_pri, 64thread_all_write, 64, 1.0, false)
1482 BENCH_REL (folly_ticket, 64thread_all_write, 64, 1.0, false)
1483 BENCH_REL (boost_shared, 64thread_all_write, 64, 1.0, false)
1484 BENCH_REL (pthrd_rwlock, 64thread_all_write, 64, 1.0, false)
1485 BENCH_REL (pthrd_mutex_, 64thread_all_write, 64, 1.0, false)
1487 // 1 lock used by everybody, 10% writes. Not much scaling to be had. Perf
1488 // is best at 1 thread, once you've got multiple threads > 8 threads hurts.
1489 BENCHMARK_DRAW_LINE()
1490 BENCHMARK_DRAW_LINE()
1491 BENCH_BASE(folly_rwspin, 1thread_10pct_write, 1, 0.10, false)
1492 BENCH_REL (shmtx_wr_pri, 1thread_10pct_write, 1, 0.10, false)
1493 BENCH_REL (shmtx_rd_pri, 1thread_10pct_write, 1, 0.10, false)
1494 BENCH_REL (folly_ticket, 1thread_10pct_write, 1, 0.10, false)
1495 BENCH_REL (boost_shared, 1thread_10pct_write, 1, 0.10, false)
1496 BENCH_REL (pthrd_rwlock, 1thread_10pct_write, 1, 0.10, false)
1497 BENCHMARK_DRAW_LINE()
1498 BENCH_BASE(folly_rwspin, 2thread_10pct_write, 2, 0.10, false)
1499 BENCH_REL (shmtx_wr_pri, 2thread_10pct_write, 2, 0.10, false)
1500 BENCH_REL (shmtx_rd_pri, 2thread_10pct_write, 2, 0.10, false)
1501 BENCH_REL (folly_ticket, 2thread_10pct_write, 2, 0.10, false)
1502 BENCH_REL (boost_shared, 2thread_10pct_write, 2, 0.10, false)
1503 BENCH_REL (pthrd_rwlock, 2thread_10pct_write, 2, 0.10, false)
1504 BENCHMARK_DRAW_LINE()
1505 BENCH_BASE(folly_rwspin, 4thread_10pct_write, 4, 0.10, false)
1506 BENCH_REL (shmtx_wr_pri, 4thread_10pct_write, 4, 0.10, false)
1507 BENCH_REL (shmtx_rd_pri, 4thread_10pct_write, 4, 0.10, false)
1508 BENCH_REL (folly_ticket, 4thread_10pct_write, 4, 0.10, false)
1509 BENCH_REL (boost_shared, 4thread_10pct_write, 4, 0.10, false)
1510 BENCH_REL (pthrd_rwlock, 4thread_10pct_write, 4, 0.10, false)
1511 BENCHMARK_DRAW_LINE()
1512 BENCH_BASE(folly_rwspin, 8thread_10pct_write, 8, 0.10, false)
1513 BENCH_REL (shmtx_wr_pri, 8thread_10pct_write, 8, 0.10, false)
1514 BENCH_REL (shmtx_rd_pri, 8thread_10pct_write, 8, 0.10, false)
1515 BENCH_REL (folly_ticket, 8thread_10pct_write, 8, 0.10, false)
1516 BENCH_REL (boost_shared, 8thread_10pct_write, 8, 0.10, false)
1517 BENCH_REL (pthrd_rwlock, 8thread_10pct_write, 8, 0.10, false)
1518 BENCHMARK_DRAW_LINE()
1519 BENCH_BASE(folly_rwspin, 16thread_10pct_write, 16, 0.10, false)
1520 BENCH_REL (shmtx_wr_pri, 16thread_10pct_write, 16, 0.10, false)
1521 BENCH_REL (shmtx_rd_pri, 16thread_10pct_write, 16, 0.10, false)
1522 BENCH_REL (folly_ticket, 16thread_10pct_write, 16, 0.10, false)
1523 BENCH_REL (boost_shared, 16thread_10pct_write, 16, 0.10, false)
1524 BENCH_REL (pthrd_rwlock, 16thread_10pct_write, 16, 0.10, false)
1525 BENCHMARK_DRAW_LINE()
1526 BENCH_BASE(folly_rwspin, 32thread_10pct_write, 32, 0.10, false)
1527 BENCH_REL (shmtx_wr_pri, 32thread_10pct_write, 32, 0.10, false)
1528 BENCH_REL (shmtx_rd_pri, 32thread_10pct_write, 32, 0.10, false)
1529 BENCH_REL (folly_ticket, 32thread_10pct_write, 32, 0.10, false)
1530 BENCH_REL (boost_shared, 32thread_10pct_write, 32, 0.10, false)
1531 BENCH_REL (pthrd_rwlock, 32thread_10pct_write, 32, 0.10, false)
1532 BENCHMARK_DRAW_LINE()
1533 BENCH_BASE(folly_rwspin, 64thread_10pct_write, 64, 0.10, false)
1534 BENCH_REL (shmtx_wr_pri, 64thread_10pct_write, 64, 0.10, false)
1535 BENCH_REL (shmtx_rd_pri, 64thread_10pct_write, 64, 0.10, false)
1536 BENCH_REL (folly_ticket, 64thread_10pct_write, 64, 0.10, false)
1537 BENCH_REL (boost_shared, 64thread_10pct_write, 64, 0.10, false)
1538 BENCH_REL (pthrd_rwlock, 64thread_10pct_write, 64, 0.10, false)
1540 // 1 lock used by everybody, 1% writes. This is a more realistic example
1541 // than the concurrent_*_reads benchmark, but still shows SharedMutex locks
1542 // winning over all of the others
1543 BENCHMARK_DRAW_LINE()
1544 BENCHMARK_DRAW_LINE()
1545 BENCH_BASE(folly_rwspin, 1thread_1pct_write, 1, 0.01, false)
1546 BENCH_REL (shmtx_wr_pri, 1thread_1pct_write, 1, 0.01, false)
1547 BENCH_REL (shmtx_w_bare, 1thread_1pct_write, 1, 0.01, false)
1548 BENCH_REL (shmtx_rd_pri, 1thread_1pct_write, 1, 0.01, false)
1549 BENCH_REL (shmtx_r_bare, 1thread_1pct_write, 1, 0.01, false)
1550 BENCH_REL (folly_ticket, 1thread_1pct_write, 1, 0.01, false)
1551 BENCH_REL (boost_shared, 1thread_1pct_write, 1, 0.01, false)
1552 BENCH_REL (pthrd_rwlock, 1thread_1pct_write, 1, 0.01, false)
1553 BENCHMARK_DRAW_LINE()
1554 BENCH_BASE(folly_rwspin, 2thread_1pct_write, 2, 0.01, false)
1555 BENCH_REL (shmtx_wr_pri, 2thread_1pct_write, 2, 0.01, false)
1556 BENCH_REL (shmtx_w_bare, 2thread_1pct_write, 2, 0.01, false)
1557 BENCH_REL (shmtx_rd_pri, 2thread_1pct_write, 2, 0.01, false)
1558 BENCH_REL (shmtx_r_bare, 2thread_1pct_write, 2, 0.01, false)
1559 BENCH_REL (folly_ticket, 2thread_1pct_write, 2, 0.01, false)
1560 BENCH_REL (boost_shared, 2thread_1pct_write, 2, 0.01, false)
1561 BENCH_REL (pthrd_rwlock, 2thread_1pct_write, 2, 0.01, false)
1562 BENCHMARK_DRAW_LINE()
1563 BENCH_BASE(folly_rwspin, 4thread_1pct_write, 4, 0.01, false)
1564 BENCH_REL (shmtx_wr_pri, 4thread_1pct_write, 4, 0.01, false)
1565 BENCH_REL (shmtx_w_bare, 4thread_1pct_write, 4, 0.01, false)
1566 BENCH_REL (shmtx_rd_pri, 4thread_1pct_write, 4, 0.01, false)
1567 BENCH_REL (shmtx_r_bare, 4thread_1pct_write, 4, 0.01, false)
1568 BENCH_REL (folly_ticket, 4thread_1pct_write, 4, 0.01, false)
1569 BENCH_REL (boost_shared, 4thread_1pct_write, 4, 0.01, false)
1570 BENCH_REL (pthrd_rwlock, 4thread_1pct_write, 4, 0.01, false)
1571 BENCHMARK_DRAW_LINE()
1572 BENCH_BASE(folly_rwspin, 8thread_1pct_write, 8, 0.01, false)
1573 BENCH_REL (shmtx_wr_pri, 8thread_1pct_write, 8, 0.01, false)
1574 BENCH_REL (shmtx_w_bare, 8thread_1pct_write, 8, 0.01, false)
1575 BENCH_REL (shmtx_rd_pri, 8thread_1pct_write, 8, 0.01, false)
1576 BENCH_REL (shmtx_r_bare, 8thread_1pct_write, 8, 0.01, false)
1577 BENCH_REL (folly_ticket, 8thread_1pct_write, 8, 0.01, false)
1578 BENCH_REL (boost_shared, 8thread_1pct_write, 8, 0.01, false)
1579 BENCH_REL (pthrd_rwlock, 8thread_1pct_write, 8, 0.01, false)
1580 BENCHMARK_DRAW_LINE()
1581 BENCH_BASE(folly_rwspin, 16thread_1pct_write, 16, 0.01, false)
1582 BENCH_REL (shmtx_wr_pri, 16thread_1pct_write, 16, 0.01, false)
1583 BENCH_REL (shmtx_w_bare, 16thread_1pct_write, 16, 0.01, false)
1584 BENCH_REL (shmtx_rd_pri, 16thread_1pct_write, 16, 0.01, false)
1585 BENCH_REL (shmtx_r_bare, 16thread_1pct_write, 16, 0.01, false)
1586 BENCH_REL (folly_ticket, 16thread_1pct_write, 16, 0.01, false)
1587 BENCH_REL (boost_shared, 16thread_1pct_write, 16, 0.01, false)
1588 BENCH_REL (pthrd_rwlock, 16thread_1pct_write, 16, 0.01, false)
1589 BENCHMARK_DRAW_LINE()
1590 BENCH_BASE(folly_rwspin, 32thread_1pct_write, 32, 0.01, false)
1591 BENCH_REL (shmtx_wr_pri, 32thread_1pct_write, 32, 0.01, false)
1592 BENCH_REL (shmtx_w_bare, 32thread_1pct_write, 32, 0.01, false)
1593 BENCH_REL (shmtx_rd_pri, 32thread_1pct_write, 32, 0.01, false)
1594 BENCH_REL (shmtx_r_bare, 32thread_1pct_write, 32, 0.01, false)
1595 BENCH_REL (folly_ticket, 32thread_1pct_write, 32, 0.01, false)
1596 BENCH_REL (boost_shared, 32thread_1pct_write, 32, 0.01, false)
1597 BENCH_REL (pthrd_rwlock, 32thread_1pct_write, 32, 0.01, false)
1598 BENCHMARK_DRAW_LINE()
1599 BENCH_BASE(folly_rwspin, 64thread_1pct_write, 64, 0.01, false)
1600 BENCH_REL (shmtx_wr_pri, 64thread_1pct_write, 64, 0.01, false)
1601 BENCH_REL (shmtx_w_bare, 64thread_1pct_write, 64, 0.01, false)
1602 BENCH_REL (shmtx_rd_pri, 64thread_1pct_write, 64, 0.01, false)
1603 BENCH_REL (shmtx_r_bare, 64thread_1pct_write, 64, 0.01, false)
1604 BENCH_REL (folly_ticket, 64thread_1pct_write, 64, 0.01, false)
1605 BENCH_REL (boost_shared, 64thread_1pct_write, 64, 0.01, false)
1606 BENCH_REL (pthrd_rwlock, 64thread_1pct_write, 64, 0.01, false)
1608 // Worst case scenario for deferred locks. No actual sharing, likely that
1609 // read operations will have to first set the kDeferredReadersPossibleBit,
1610 // and likely that writers will have to scan deferredReaders[].
1611 BENCHMARK_DRAW_LINE()
1612 BENCH_BASE(folly_rwspin, 2thr_2lock_50pct_write, 2, 0.50, true)
1613 BENCH_REL (shmtx_wr_pri, 2thr_2lock_50pct_write, 2, 0.50, true)
1614 BENCH_REL (shmtx_rd_pri, 2thr_2lock_50pct_write, 2, 0.50, true)
1615 BENCH_BASE(folly_rwspin, 4thr_4lock_50pct_write, 4, 0.50, true)
1616 BENCH_REL (shmtx_wr_pri, 4thr_4lock_50pct_write, 4, 0.50, true)
1617 BENCH_REL (shmtx_rd_pri, 4thr_4lock_50pct_write, 4, 0.50, true)
1618 BENCH_BASE(folly_rwspin, 8thr_8lock_50pct_write, 8, 0.50, true)
1619 BENCH_REL (shmtx_wr_pri, 8thr_8lock_50pct_write, 8, 0.50, true)
1620 BENCH_REL (shmtx_rd_pri, 8thr_8lock_50pct_write, 8, 0.50, true)
1621 BENCH_BASE(folly_rwspin, 16thr_16lock_50pct_write, 16, 0.50, true)
1622 BENCH_REL (shmtx_wr_pri, 16thr_16lock_50pct_write, 16, 0.50, true)
1623 BENCH_REL (shmtx_rd_pri, 16thr_16lock_50pct_write, 16, 0.50, true)
1624 BENCH_BASE(folly_rwspin, 32thr_32lock_50pct_write, 32, 0.50, true)
1625 BENCH_REL (shmtx_wr_pri, 32thr_32lock_50pct_write, 32, 0.50, true)
1626 BENCH_REL (shmtx_rd_pri, 32thr_32lock_50pct_write, 32, 0.50, true)
1627 BENCH_BASE(folly_rwspin, 64thr_64lock_50pct_write, 64, 0.50, true)
1628 BENCH_REL (shmtx_wr_pri, 64thr_64lock_50pct_write, 64, 0.50, true)
1629 BENCH_REL (shmtx_rd_pri, 64thr_64lock_50pct_write, 64, 0.50, true)
1630 BENCHMARK_DRAW_LINE()
1631 BENCH_BASE(folly_rwspin, 2thr_2lock_10pct_write, 2, 0.10, true)
1632 BENCH_REL (shmtx_wr_pri, 2thr_2lock_10pct_write, 2, 0.10, true)
1633 BENCH_REL (shmtx_rd_pri, 2thr_2lock_10pct_write, 2, 0.10, true)
1634 BENCH_BASE(folly_rwspin, 4thr_4lock_10pct_write, 4, 0.10, true)
1635 BENCH_REL (shmtx_wr_pri, 4thr_4lock_10pct_write, 4, 0.10, true)
1636 BENCH_REL (shmtx_rd_pri, 4thr_4lock_10pct_write, 4, 0.10, true)
1637 BENCH_BASE(folly_rwspin, 8thr_8lock_10pct_write, 8, 0.10, true)
1638 BENCH_REL (shmtx_wr_pri, 8thr_8lock_10pct_write, 8, 0.10, true)
1639 BENCH_REL (shmtx_rd_pri, 8thr_8lock_10pct_write, 8, 0.10, true)
1640 BENCH_BASE(folly_rwspin, 16thr_16lock_10pct_write, 16, 0.10, true)
1641 BENCH_REL (shmtx_wr_pri, 16thr_16lock_10pct_write, 16, 0.10, true)
1642 BENCH_REL (shmtx_rd_pri, 16thr_16lock_10pct_write, 16, 0.10, true)
1643 BENCH_BASE(folly_rwspin, 32thr_32lock_10pct_write, 32, 0.10, true)
1644 BENCH_REL (shmtx_wr_pri, 32thr_32lock_10pct_write, 32, 0.10, true)
1645 BENCH_REL (shmtx_rd_pri, 32thr_32lock_10pct_write, 32, 0.10, true)
1646 BENCH_BASE(folly_rwspin, 64thr_64lock_10pct_write, 64, 0.10, true)
1647 BENCH_REL (shmtx_wr_pri, 64thr_64lock_10pct_write, 64, 0.10, true)
1648 BENCH_REL (shmtx_rd_pri, 64thr_64lock_10pct_write, 64, 0.10, true)
1649 BENCHMARK_DRAW_LINE()
1650 BENCH_BASE(folly_rwspin, 2thr_2lock_1pct_write, 2, 0.01, true)
1651 BENCH_REL (shmtx_wr_pri, 2thr_2lock_1pct_write, 2, 0.01, true)
1652 BENCH_REL (shmtx_rd_pri, 2thr_2lock_1pct_write, 2, 0.01, true)
1653 BENCH_BASE(folly_rwspin, 4thr_4lock_1pct_write, 4, 0.01, true)
1654 BENCH_REL (shmtx_wr_pri, 4thr_4lock_1pct_write, 4, 0.01, true)
1655 BENCH_REL (shmtx_rd_pri, 4thr_4lock_1pct_write, 4, 0.01, true)
1656 BENCH_BASE(folly_rwspin, 8thr_8lock_1pct_write, 8, 0.01, true)
1657 BENCH_REL (shmtx_wr_pri, 8thr_8lock_1pct_write, 8, 0.01, true)
1658 BENCH_REL (shmtx_rd_pri, 8thr_8lock_1pct_write, 8, 0.01, true)
1659 BENCH_BASE(folly_rwspin, 16thr_16lock_1pct_write, 16, 0.01, true)
1660 BENCH_REL (shmtx_wr_pri, 16thr_16lock_1pct_write, 16, 0.01, true)
1661 BENCH_REL (shmtx_rd_pri, 16thr_16lock_1pct_write, 16, 0.01, true)
1662 BENCH_BASE(folly_rwspin, 32thr_32lock_1pct_write, 32, 0.01, true)
1663 BENCH_REL (shmtx_wr_pri, 32thr_32lock_1pct_write, 32, 0.01, true)
1664 BENCH_REL (shmtx_rd_pri, 32thr_32lock_1pct_write, 32, 0.01, true)
1665 BENCH_BASE(folly_rwspin, 64thr_64lock_1pct_write, 64, 0.01, true)
1666 BENCH_REL (shmtx_wr_pri, 64thr_64lock_1pct_write, 64, 0.01, true)
1667 BENCH_REL (shmtx_rd_pri, 64thr_64lock_1pct_write, 64, 0.01, true)
1669 // Ping-pong tests have a scaled number of iterations, because their burn
1670 // loop would make them too slow otherwise. Ping-pong with burn count of
1671 // 100k or 300k shows the advantage of soft-spin, reducing the cost of
1672 // each wakeup by about 20 usec. (Take benchmark reported difference,
1673 // ~400 nanos, multiply by the scale of 100, then divide by 2 because
1674 // each round has two wakeups.)
1675 BENCHMARK_DRAW_LINE()
1676 BENCHMARK_DRAW_LINE()
1677 BENCH_BASE(folly_rwspin_ping_pong, burn0, 1, 0)
1678 BENCH_REL (shmtx_w_bare_ping_pong, burn0, 1, 0)
1679 BENCH_REL (shmtx_r_bare_ping_pong, burn0, 1, 0)
1680 BENCH_REL (folly_ticket_ping_pong, burn0, 1, 0)
1681 BENCH_REL (boost_shared_ping_pong, burn0, 1, 0)
1682 BENCH_REL (pthrd_rwlock_ping_pong, burn0, 1, 0)
1683 BENCHMARK_DRAW_LINE()
1684 BENCH_BASE(folly_rwspin_ping_pong, burn100k, 100, 100000)
1685 BENCH_REL (shmtx_w_bare_ping_pong, burn100k, 100, 100000)
1686 BENCH_REL (shmtx_r_bare_ping_pong, burn100k, 100, 100000)
1687 BENCH_REL (folly_ticket_ping_pong, burn100k, 100, 100000)
1688 BENCH_REL (boost_shared_ping_pong, burn100k, 100, 100000)
1689 BENCH_REL (pthrd_rwlock_ping_pong, burn100k, 100, 100000)
1690 BENCHMARK_DRAW_LINE()
1691 BENCH_BASE(folly_rwspin_ping_pong, burn300k, 100, 300000)
1692 BENCH_REL (shmtx_w_bare_ping_pong, burn300k, 100, 300000)
1693 BENCH_REL (shmtx_r_bare_ping_pong, burn300k, 100, 300000)
1694 BENCH_REL (folly_ticket_ping_pong, burn300k, 100, 300000)
1695 BENCH_REL (boost_shared_ping_pong, burn300k, 100, 300000)
1696 BENCH_REL (pthrd_rwlock_ping_pong, burn300k, 100, 300000)
1697 BENCHMARK_DRAW_LINE()
1698 BENCH_BASE(folly_rwspin_ping_pong, burn1M, 1000, 1000000)
1699 BENCH_REL (shmtx_w_bare_ping_pong, burn1M, 1000, 1000000)
1700 BENCH_REL (shmtx_r_bare_ping_pong, burn1M, 1000, 1000000)
1701 BENCH_REL (folly_ticket_ping_pong, burn1M, 1000, 1000000)
1702 BENCH_REL (boost_shared_ping_pong, burn1M, 1000, 1000000)
1703 BENCH_REL (pthrd_rwlock_ping_pong, burn1M, 1000, 1000000)
1705 // Reproduce with 10 minutes and
1706 // sudo nice -n -20 \
1707 // shared_mutex_test --benchmark --bm_min_iters=1000000
1709 // Comparison use folly::RWSpinLock as the baseline, with the
1710 // following row being the default SharedMutex (using *Holder or
1711 // Token-ful methods).
1712 // ============================================================================
1713 // folly/experimental/test/SharedMutexTest.cpp relative time/iter iters/s
1714 // ============================================================================
1715 // single_thread_lock_shared_unlock_shared 22.78ns 43.89M
1716 // single_thread_lock_unlock 26.01ns 38.45M
1717 // ----------------------------------------------------------------------------
1718 // ----------------------------------------------------------------------------
1719 // folly_rwspin_reads(1thread) 15.09ns 66.25M
1720 // shmtx_wr_pri_reads(1thread) 69.89% 21.60ns 46.30M
1721 // shmtx_w_bare_reads(1thread) 58.25% 25.91ns 38.59M
1722 // shmtx_rd_pri_reads(1thread) 72.50% 20.82ns 48.03M
1723 // shmtx_r_bare_reads(1thread) 58.27% 25.91ns 38.60M
1724 // folly_ticket_reads(1thread) 54.80% 27.55ns 36.30M
1725 // boost_shared_reads(1thread) 10.88% 138.80ns 7.20M
1726 // pthrd_rwlock_reads(1thread) 40.68% 37.11ns 26.95M
1727 // ----------------------------------------------------------------------------
1728 // folly_rwspin_reads(2thread) 92.63ns 10.80M
1729 // shmtx_wr_pri_reads(2thread) 462.86% 20.01ns 49.97M
1730 // shmtx_w_bare_reads(2thread) 430.53% 21.51ns 46.48M
1731 // shmtx_rd_pri_reads(2thread) 487.13% 19.01ns 52.59M
1732 // shmtx_r_bare_reads(2thread) 433.35% 21.37ns 46.79M
1733 // folly_ticket_reads(2thread) 69.82% 132.67ns 7.54M
1734 // boost_shared_reads(2thread) 36.66% 252.63ns 3.96M
1735 // pthrd_rwlock_reads(2thread) 127.76% 72.50ns 13.79M
1736 // ----------------------------------------------------------------------------
1737 // folly_rwspin_reads(4thread) 97.45ns 10.26M
1738 // shmtx_wr_pri_reads(4thread) 978.22% 9.96ns 100.38M
1739 // shmtx_w_bare_reads(4thread) 908.35% 10.73ns 93.21M
1740 // shmtx_rd_pri_reads(4thread) 1032.29% 9.44ns 105.93M
1741 // shmtx_r_bare_reads(4thread) 912.38% 10.68ns 93.63M
1742 // folly_ticket_reads(4thread) 46.08% 211.46ns 4.73M
1743 // boost_shared_reads(4thread) 25.00% 389.74ns 2.57M
1744 // pthrd_rwlock_reads(4thread) 47.53% 205.01ns 4.88M
1745 // ----------------------------------------------------------------------------
1746 // folly_rwspin_reads(8thread) 147.24ns 6.79M
1747 // shmtx_wr_pri_reads(8thread) 2915.66% 5.05ns 198.02M
1748 // shmtx_w_bare_reads(8thread) 2699.32% 5.45ns 183.32M
1749 // shmtx_rd_pri_reads(8thread) 3092.58% 4.76ns 210.03M
1750 // shmtx_r_bare_reads(8thread) 2744.63% 5.36ns 186.40M
1751 // folly_ticket_reads(8thread) 54.84% 268.47ns 3.72M
1752 // boost_shared_reads(8thread) 42.40% 347.30ns 2.88M
1753 // pthrd_rwlock_reads(8thread) 78.90% 186.63ns 5.36M
1754 // ----------------------------------------------------------------------------
1755 // folly_rwspin_reads(16thread) 166.25ns 6.02M
1756 // shmtx_wr_pri_reads(16thread) 6133.03% 2.71ns 368.91M
1757 // shmtx_w_bare_reads(16thread) 5936.05% 2.80ns 357.06M
1758 // shmtx_rd_pri_reads(16thread) 6786.57% 2.45ns 408.22M
1759 // shmtx_r_bare_reads(16thread) 5995.54% 2.77ns 360.64M
1760 // folly_ticket_reads(16thread) 56.35% 295.01ns 3.39M
1761 // boost_shared_reads(16thread) 51.62% 322.08ns 3.10M
1762 // pthrd_rwlock_reads(16thread) 92.47% 179.79ns 5.56M
1763 // ----------------------------------------------------------------------------
1764 // folly_rwspin_reads(32thread) 107.72ns 9.28M
1765 // shmtx_wr_pri_reads(32thread) 6772.80% 1.59ns 628.77M
1766 // shmtx_w_bare_reads(32thread) 6236.13% 1.73ns 578.94M
1767 // shmtx_rd_pri_reads(32thread) 8143.32% 1.32ns 756.00M
1768 // shmtx_r_bare_reads(32thread) 6485.18% 1.66ns 602.06M
1769 // folly_ticket_reads(32thread) 35.12% 306.73ns 3.26M
1770 // boost_shared_reads(32thread) 28.19% 382.17ns 2.62M
1771 // pthrd_rwlock_reads(32thread) 65.29% 164.99ns 6.06M
1772 // ----------------------------------------------------------------------------
1773 // folly_rwspin_reads(64thread) 119.46ns 8.37M
1774 // shmtx_wr_pri_reads(64thread) 6744.92% 1.77ns 564.60M
1775 // shmtx_w_bare_reads(64thread) 6268.50% 1.91ns 524.72M
1776 // shmtx_rd_pri_reads(64thread) 7508.56% 1.59ns 628.52M
1777 // shmtx_r_bare_reads(64thread) 6299.53% 1.90ns 527.32M
1778 // folly_ticket_reads(64thread) 37.42% 319.26ns 3.13M
1779 // boost_shared_reads(64thread) 32.58% 366.70ns 2.73M
1780 // pthrd_rwlock_reads(64thread) 73.64% 162.24ns 6.16M
1781 // ----------------------------------------------------------------------------
1782 // ----------------------------------------------------------------------------
1783 // folly_rwspin(1thread_all_write) 25.51ns 39.19M
1784 // shmtx_wr_pri(1thread_all_write) 97.38% 26.20ns 38.17M
1785 // shmtx_rd_pri(1thread_all_write) 97.55% 26.16ns 38.23M
1786 // folly_ticket(1thread_all_write) 90.98% 28.04ns 35.66M
1787 // boost_shared(1thread_all_write) 16.80% 151.89ns 6.58M
1788 // pthrd_rwlock(1thread_all_write) 63.86% 39.96ns 25.03M
1789 // pthrd_mutex_(1thread_all_write) 82.05% 31.09ns 32.16M
1790 // ----------------------------------------------------------------------------
1791 // folly_rwspin(2thread_all_write) 100.70ns 9.93M
1792 // shmtx_wr_pri(2thread_all_write) 40.83% 246.61ns 4.05M
1793 // shmtx_rd_pri(2thread_all_write) 40.53% 248.44ns 4.03M
1794 // folly_ticket(2thread_all_write) 58.49% 172.17ns 5.81M
1795 // boost_shared(2thread_all_write) 24.26% 415.00ns 2.41M
1796 // pthrd_rwlock(2thread_all_write) 41.35% 243.49ns 4.11M
1797 // pthrd_mutex_(2thread_all_write) 146.91% 68.55ns 14.59M
1798 // ----------------------------------------------------------------------------
1799 // folly_rwspin(4thread_all_write) 199.52ns 5.01M
1800 // shmtx_wr_pri(4thread_all_write) 51.71% 385.86ns 2.59M
1801 // shmtx_rd_pri(4thread_all_write) 49.43% 403.62ns 2.48M
1802 // folly_ticket(4thread_all_write) 117.88% 169.26ns 5.91M
1803 // boost_shared(4thread_all_write) 9.81% 2.03us 491.48K
1804 // pthrd_rwlock(4thread_all_write) 28.23% 706.69ns 1.42M
1805 // pthrd_mutex_(4thread_all_write) 111.54% 178.88ns 5.59M
1806 // ----------------------------------------------------------------------------
1807 // folly_rwspin(8thread_all_write) 304.61ns 3.28M
1808 // shmtx_wr_pri(8thread_all_write) 69.77% 436.59ns 2.29M
1809 // shmtx_rd_pri(8thread_all_write) 66.58% 457.51ns 2.19M
1810 // folly_ticket(8thread_all_write) 141.00% 216.03ns 4.63M
1811 // boost_shared(8thread_all_write) 6.11% 4.99us 200.59K
1812 // pthrd_rwlock(8thread_all_write) 38.03% 800.88ns 1.25M
1813 // pthrd_mutex_(8thread_all_write) 177.66% 171.45ns 5.83M
1814 // ----------------------------------------------------------------------------
1815 // folly_rwspin(16thread_all_write) 576.97ns 1.73M
1816 // shmtx_wr_pri(16thread_all_write) 105.72% 545.77ns 1.83M
1817 // shmtx_rd_pri(16thread_all_write) 105.13% 548.83ns 1.82M
1818 // folly_ticket(16thread_all_write) 161.70% 356.82ns 2.80M
1819 // boost_shared(16thread_all_write) 7.73% 7.46us 134.03K
1820 // pthrd_rwlock(16thread_all_write) 96.88% 595.54ns 1.68M
1821 // pthrd_mutex_(16thread_all_write) 330.44% 174.61ns 5.73M
1822 // ----------------------------------------------------------------------------
1823 // folly_rwspin(32thread_all_write) 1.41us 707.76K
1824 // shmtx_wr_pri(32thread_all_write) 240.46% 587.58ns 1.70M
1825 // shmtx_rd_pri(32thread_all_write) 393.71% 358.87ns 2.79M
1826 // folly_ticket(32thread_all_write) 325.07% 434.65ns 2.30M
1827 // boost_shared(32thread_all_write) 18.57% 7.61us 131.43K
1828 // pthrd_rwlock(32thread_all_write) 266.78% 529.62ns 1.89M
1829 // pthrd_mutex_(32thread_all_write) 877.89% 160.94ns 6.21M
1830 // ----------------------------------------------------------------------------
1831 // folly_rwspin(64thread_all_write) 1.76us 566.94K
1832 // shmtx_wr_pri(64thread_all_write) 255.67% 689.91ns 1.45M
1833 // shmtx_rd_pri(64thread_all_write) 468.82% 376.23ns 2.66M
1834 // folly_ticket(64thread_all_write) 294.72% 598.49ns 1.67M
1835 // boost_shared(64thread_all_write) 23.39% 7.54us 132.58K
1836 // pthrd_rwlock(64thread_all_write) 321.39% 548.83ns 1.82M
1837 // pthrd_mutex_(64thread_all_write) 1165.04% 151.40ns 6.61M
1838 // ----------------------------------------------------------------------------
1839 // ----------------------------------------------------------------------------
1840 // folly_rwspin(1thread_10pct_write) 19.51ns 51.26M
1841 // shmtx_wr_pri(1thread_10pct_write) 83.25% 23.43ns 42.67M
1842 // shmtx_rd_pri(1thread_10pct_write) 83.31% 23.42ns 42.71M
1843 // folly_ticket(1thread_10pct_write) 70.88% 27.52ns 36.34M
1844 // boost_shared(1thread_10pct_write) 13.09% 148.99ns 6.71M
1845 // pthrd_rwlock(1thread_10pct_write) 47.41% 41.15ns 24.30M
1846 // ----------------------------------------------------------------------------
1847 // folly_rwspin(2thread_10pct_write) 159.42ns 6.27M
1848 // shmtx_wr_pri(2thread_10pct_write) 188.44% 84.60ns 11.82M
1849 // shmtx_rd_pri(2thread_10pct_write) 188.29% 84.67ns 11.81M
1850 // folly_ticket(2thread_10pct_write) 140.28% 113.64ns 8.80M
1851 // boost_shared(2thread_10pct_write) 42.09% 378.81ns 2.64M
1852 // pthrd_rwlock(2thread_10pct_write) 103.86% 153.49ns 6.51M
1853 // ----------------------------------------------------------------------------
1854 // folly_rwspin(4thread_10pct_write) 193.35ns 5.17M
1855 // shmtx_wr_pri(4thread_10pct_write) 184.30% 104.91ns 9.53M
1856 // shmtx_rd_pri(4thread_10pct_write) 163.76% 118.07ns 8.47M
1857 // folly_ticket(4thread_10pct_write) 124.07% 155.84ns 6.42M
1858 // boost_shared(4thread_10pct_write) 16.32% 1.18us 843.92K
1859 // pthrd_rwlock(4thread_10pct_write) 48.59% 397.94ns 2.51M
1860 // ----------------------------------------------------------------------------
1861 // folly_rwspin(8thread_10pct_write) 373.17ns 2.68M
1862 // shmtx_wr_pri(8thread_10pct_write) 252.02% 148.08ns 6.75M
1863 // shmtx_rd_pri(8thread_10pct_write) 203.59% 183.30ns 5.46M
1864 // folly_ticket(8thread_10pct_write) 184.37% 202.40ns 4.94M
1865 // boost_shared(8thread_10pct_write) 15.85% 2.35us 424.72K
1866 // pthrd_rwlock(8thread_10pct_write) 83.03% 449.45ns 2.22M
1867 // ----------------------------------------------------------------------------
1868 // folly_rwspin(16thread_10pct_write) 742.87ns 1.35M
1869 // shmtx_wr_pri(16thread_10pct_write) 344.27% 215.78ns 4.63M
1870 // shmtx_rd_pri(16thread_10pct_write) 287.04% 258.80ns 3.86M
1871 // folly_ticket(16thread_10pct_write) 277.25% 267.94ns 3.73M
1872 // boost_shared(16thread_10pct_write) 15.33% 4.85us 206.30K
1873 // pthrd_rwlock(16thread_10pct_write) 158.34% 469.16ns 2.13M
1874 // ----------------------------------------------------------------------------
1875 // folly_rwspin(32thread_10pct_write) 799.97ns 1.25M
1876 // shmtx_wr_pri(32thread_10pct_write) 351.40% 227.65ns 4.39M
1877 // shmtx_rd_pri(32thread_10pct_write) 341.71% 234.11ns 4.27M
1878 // folly_ticket(32thread_10pct_write) 245.91% 325.31ns 3.07M
1879 // boost_shared(32thread_10pct_write) 7.72% 10.36us 96.56K
1880 // pthrd_rwlock(32thread_10pct_write) 165.87% 482.30ns 2.07M
1881 // ----------------------------------------------------------------------------
1882 // folly_rwspin(64thread_10pct_write) 1.12us 892.01K
1883 // shmtx_wr_pri(64thread_10pct_write) 429.84% 260.81ns 3.83M
1884 // shmtx_rd_pri(64thread_10pct_write) 456.93% 245.35ns 4.08M
1885 // folly_ticket(64thread_10pct_write) 219.21% 511.42ns 1.96M
1886 // boost_shared(64thread_10pct_write) 5.43% 20.65us 48.44K
1887 // pthrd_rwlock(64thread_10pct_write) 233.93% 479.23ns 2.09M
1888 // ----------------------------------------------------------------------------
1889 // ----------------------------------------------------------------------------
1890 // folly_rwspin(1thread_1pct_write) 18.88ns 52.98M
1891 // shmtx_wr_pri(1thread_1pct_write) 81.53% 23.15ns 43.19M
1892 // shmtx_w_bare(1thread_1pct_write) 67.90% 27.80ns 35.97M
1893 // shmtx_rd_pri(1thread_1pct_write) 81.50% 23.16ns 43.18M
1894 // shmtx_r_bare(1thread_1pct_write) 67.74% 27.86ns 35.89M
1895 // folly_ticket(1thread_1pct_write) 68.68% 27.48ns 36.39M
1896 // boost_shared(1thread_1pct_write) 12.80% 147.51ns 6.78M
1897 // pthrd_rwlock(1thread_1pct_write) 45.81% 41.20ns 24.27M
1898 // ----------------------------------------------------------------------------
1899 // folly_rwspin(2thread_1pct_write) 125.85ns 7.95M
1900 // shmtx_wr_pri(2thread_1pct_write) 359.04% 35.05ns 28.53M
1901 // shmtx_w_bare(2thread_1pct_write) 475.60% 26.46ns 37.79M
1902 // shmtx_rd_pri(2thread_1pct_write) 332.75% 37.82ns 26.44M
1903 // shmtx_r_bare(2thread_1pct_write) 115.64% 108.83ns 9.19M
1904 // folly_ticket(2thread_1pct_write) 140.24% 89.74ns 11.14M
1905 // boost_shared(2thread_1pct_write) 40.62% 309.82ns 3.23M
1906 // pthrd_rwlock(2thread_1pct_write) 134.67% 93.45ns 10.70M
1907 // ----------------------------------------------------------------------------
1908 // folly_rwspin(4thread_1pct_write) 126.70ns 7.89M
1909 // shmtx_wr_pri(4thread_1pct_write) 422.20% 30.01ns 33.32M
1910 // shmtx_w_bare(4thread_1pct_write) 403.52% 31.40ns 31.85M
1911 // shmtx_rd_pri(4thread_1pct_write) 282.50% 44.85ns 22.30M
1912 // shmtx_r_bare(4thread_1pct_write) 66.30% 191.10ns 5.23M
1913 // folly_ticket(4thread_1pct_write) 91.93% 137.83ns 7.26M
1914 // boost_shared(4thread_1pct_write) 22.74% 557.10ns 1.80M
1915 // pthrd_rwlock(4thread_1pct_write) 55.66% 227.62ns 4.39M
1916 // ----------------------------------------------------------------------------
1917 // folly_rwspin(8thread_1pct_write) 169.42ns 5.90M
1918 // shmtx_wr_pri(8thread_1pct_write) 567.81% 29.84ns 33.51M
1919 // shmtx_w_bare(8thread_1pct_write) 519.18% 32.63ns 30.64M
1920 // shmtx_rd_pri(8thread_1pct_write) 172.36% 98.30ns 10.17M
1921 // shmtx_r_bare(8thread_1pct_write) 75.56% 224.21ns 4.46M
1922 // folly_ticket(8thread_1pct_write) 104.03% 162.85ns 6.14M
1923 // boost_shared(8thread_1pct_write) 22.01% 769.73ns 1.30M
1924 // pthrd_rwlock(8thread_1pct_write) 71.79% 235.99ns 4.24M
1925 // ----------------------------------------------------------------------------
1926 // folly_rwspin(16thread_1pct_write) 385.88ns 2.59M
1927 // shmtx_wr_pri(16thread_1pct_write) 1039.03% 37.14ns 26.93M
1928 // shmtx_w_bare(16thread_1pct_write) 997.26% 38.69ns 25.84M
1929 // shmtx_rd_pri(16thread_1pct_write) 263.60% 146.39ns 6.83M
1930 // shmtx_r_bare(16thread_1pct_write) 173.16% 222.85ns 4.49M
1931 // folly_ticket(16thread_1pct_write) 179.37% 215.13ns 4.65M
1932 // boost_shared(16thread_1pct_write) 26.95% 1.43us 698.42K
1933 // pthrd_rwlock(16thread_1pct_write) 166.70% 231.48ns 4.32M
1934 // ----------------------------------------------------------------------------
1935 // folly_rwspin(32thread_1pct_write) 382.49ns 2.61M
1936 // shmtx_wr_pri(32thread_1pct_write) 1046.64% 36.54ns 27.36M
1937 // shmtx_w_bare(32thread_1pct_write) 922.87% 41.45ns 24.13M
1938 // shmtx_rd_pri(32thread_1pct_write) 251.93% 151.82ns 6.59M
1939 // shmtx_r_bare(32thread_1pct_write) 176.44% 216.78ns 4.61M
1940 // folly_ticket(32thread_1pct_write) 131.07% 291.82ns 3.43M
1941 // boost_shared(32thread_1pct_write) 12.77% 2.99us 333.95K
1942 // pthrd_rwlock(32thread_1pct_write) 173.43% 220.55ns 4.53M
1943 // ----------------------------------------------------------------------------
1944 // folly_rwspin(64thread_1pct_write) 510.54ns 1.96M
1945 // shmtx_wr_pri(64thread_1pct_write) 1378.27% 37.04ns 27.00M
1946 // shmtx_w_bare(64thread_1pct_write) 1178.24% 43.33ns 23.08M
1947 // shmtx_rd_pri(64thread_1pct_write) 325.29% 156.95ns 6.37M
1948 // shmtx_r_bare(64thread_1pct_write) 247.82% 206.02ns 4.85M
1949 // folly_ticket(64thread_1pct_write) 117.87% 433.13ns 2.31M
1950 // boost_shared(64thread_1pct_write) 9.45% 5.40us 185.09K
1951 // pthrd_rwlock(64thread_1pct_write) 236.72% 215.68ns 4.64M
1952 // ----------------------------------------------------------------------------
1953 // folly_rwspin(2thr_2lock_50pct_write) 10.85ns 92.15M
1954 // shmtx_wr_pri(2thr_2lock_50pct_write) 81.73% 13.28ns 75.32M
1955 // shmtx_rd_pri(2thr_2lock_50pct_write) 81.82% 13.26ns 75.40M
1956 // folly_rwspin(4thr_4lock_50pct_write) 5.29ns 188.90M
1957 // shmtx_wr_pri(4thr_4lock_50pct_write) 80.89% 6.54ns 152.80M
1958 // shmtx_rd_pri(4thr_4lock_50pct_write) 81.07% 6.53ns 153.14M
1959 // folly_rwspin(8thr_8lock_50pct_write) 2.63ns 380.57M
1960 // shmtx_wr_pri(8thr_8lock_50pct_write) 80.56% 3.26ns 306.57M
1961 // shmtx_rd_pri(8thr_8lock_50pct_write) 80.29% 3.27ns 305.54M
1962 // folly_rwspin(16thr_16lock_50pct_write) 1.31ns 764.70M
1963 // shmtx_wr_pri(16thr_16lock_50pct_write) 79.32% 1.65ns 606.54M
1964 // shmtx_rd_pri(16thr_16lock_50pct_write) 79.62% 1.64ns 608.84M
1965 // folly_rwspin(32thr_32lock_50pct_write) 1.20ns 836.75M
1966 // shmtx_wr_pri(32thr_32lock_50pct_write) 91.67% 1.30ns 767.07M
1967 // shmtx_rd_pri(32thr_32lock_50pct_write) 92.00% 1.30ns 769.82M
1968 // folly_rwspin(64thr_64lock_50pct_write) 1.39ns 717.80M
1969 // shmtx_wr_pri(64thr_64lock_50pct_write) 93.21% 1.49ns 669.08M
1970 // shmtx_rd_pri(64thr_64lock_50pct_write) 92.49% 1.51ns 663.89M
1971 // ----------------------------------------------------------------------------
1972 // folly_rwspin(2thr_2lock_10pct_write) 10.24ns 97.70M
1973 // shmtx_wr_pri(2thr_2lock_10pct_write) 76.46% 13.39ns 74.70M
1974 // shmtx_rd_pri(2thr_2lock_10pct_write) 76.35% 13.41ns 74.60M
1975 // folly_rwspin(4thr_4lock_10pct_write) 5.02ns 199.03M
1976 // shmtx_wr_pri(4thr_4lock_10pct_write) 75.83% 6.63ns 150.91M
1977 // shmtx_rd_pri(4thr_4lock_10pct_write) 76.10% 6.60ns 151.46M
1978 // folly_rwspin(8thr_8lock_10pct_write) 2.47ns 405.50M
1979 // shmtx_wr_pri(8thr_8lock_10pct_write) 74.54% 3.31ns 302.27M
1980 // shmtx_rd_pri(8thr_8lock_10pct_write) 74.85% 3.29ns 303.52M
1981 // folly_rwspin(16thr_16lock_10pct_write) 1.22ns 818.68M
1982 // shmtx_wr_pri(16thr_16lock_10pct_write) 73.35% 1.67ns 600.47M
1983 // shmtx_rd_pri(16thr_16lock_10pct_write) 73.38% 1.66ns 600.73M
1984 // folly_rwspin(32thr_32lock_10pct_write) 1.21ns 827.95M
1985 // shmtx_wr_pri(32thr_32lock_10pct_write) 96.13% 1.26ns 795.89M
1986 // shmtx_rd_pri(32thr_32lock_10pct_write) 96.01% 1.26ns 794.95M
1987 // folly_rwspin(64thr_64lock_10pct_write) 1.40ns 716.17M
1988 // shmtx_wr_pri(64thr_64lock_10pct_write) 96.91% 1.44ns 694.03M
1989 // shmtx_rd_pri(64thr_64lock_10pct_write) 96.85% 1.44ns 693.64M
1990 // ----------------------------------------------------------------------------
1991 // folly_rwspin(2thr_2lock_1pct_write) 10.11ns 98.91M
1992 // shmtx_wr_pri(2thr_2lock_1pct_write) 75.07% 13.47ns 74.25M
1993 // shmtx_rd_pri(2thr_2lock_1pct_write) 74.98% 13.48ns 74.16M
1994 // folly_rwspin(4thr_4lock_1pct_write) 4.96ns 201.77M
1995 // shmtx_wr_pri(4thr_4lock_1pct_write) 74.59% 6.64ns 150.49M
1996 // shmtx_rd_pri(4thr_4lock_1pct_write) 74.60% 6.64ns 150.51M
1997 // folly_rwspin(8thr_8lock_1pct_write) 2.44ns 410.42M
1998 // shmtx_wr_pri(8thr_8lock_1pct_write) 73.68% 3.31ns 302.41M
1999 // shmtx_rd_pri(8thr_8lock_1pct_write) 73.38% 3.32ns 301.16M
2000 // folly_rwspin(16thr_16lock_1pct_write) 1.21ns 827.53M
2001 // shmtx_wr_pri(16thr_16lock_1pct_write) 72.11% 1.68ns 596.74M
2002 // shmtx_rd_pri(16thr_16lock_1pct_write) 72.23% 1.67ns 597.73M
2003 // folly_rwspin(32thr_32lock_1pct_write) 1.22ns 819.53M
2004 // shmtx_wr_pri(32thr_32lock_1pct_write) 98.17% 1.24ns 804.50M
2005 // shmtx_rd_pri(32thr_32lock_1pct_write) 98.21% 1.24ns 804.86M
2006 // folly_rwspin(64thr_64lock_1pct_write) 1.41ns 710.26M
2007 // shmtx_wr_pri(64thr_64lock_1pct_write) 97.81% 1.44ns 694.71M
2008 // shmtx_rd_pri(64thr_64lock_1pct_write) 99.44% 1.42ns 706.28M
2009 // ----------------------------------------------------------------------------
2010 // ----------------------------------------------------------------------------
2011 // folly_rwspin_ping_pong(burn0) 641.24ns 1.56M
2012 // shmtx_w_bare_ping_pong(burn0) 91.07% 704.12ns 1.42M
2013 // shmtx_r_bare_ping_pong(burn0) 78.70% 814.84ns 1.23M
2014 // folly_ticket_ping_pong(burn0) 85.67% 748.53ns 1.34M
2015 // boost_shared_ping_pong(burn0) 5.58% 11.50us 86.96K
2016 // pthrd_rwlock_ping_pong(burn0) 8.81% 7.28us 137.40K
2017 // ----------------------------------------------------------------------------
2018 // folly_rwspin_ping_pong(burn100k) 678.97ns 1.47M
2019 // shmtx_w_bare_ping_pong(burn100k) 99.73% 680.78ns 1.47M
2020 // shmtx_r_bare_ping_pong(burn100k) 98.67% 688.13ns 1.45M
2021 // folly_ticket_ping_pong(burn100k) 99.31% 683.68ns 1.46M
2022 // boost_shared_ping_pong(burn100k) 58.23% 1.17us 857.64K
2023 // pthrd_rwlock_ping_pong(burn100k) 57.43% 1.18us 845.86K
2024 // ----------------------------------------------------------------------------
2025 // folly_rwspin_ping_pong(burn300k) 2.03us 492.99K
2026 // shmtx_w_bare_ping_pong(burn300k) 99.98% 2.03us 492.88K
2027 // shmtx_r_bare_ping_pong(burn300k) 99.94% 2.03us 492.68K
2028 // folly_ticket_ping_pong(burn300k) 99.88% 2.03us 492.40K
2029 // boost_shared_ping_pong(burn300k) 81.43% 2.49us 401.47K
2030 // pthrd_rwlock_ping_pong(burn300k) 83.22% 2.44us 410.29K
2031 // ----------------------------------------------------------------------------
2032 // folly_rwspin_ping_pong(burn1M) 677.07ns 1.48M
2033 // shmtx_w_bare_ping_pong(burn1M) 100.50% 673.74ns 1.48M
2034 // shmtx_r_bare_ping_pong(burn1M) 100.14% 676.12ns 1.48M
2035 // folly_ticket_ping_pong(burn1M) 100.44% 674.14ns 1.48M
2036 // boost_shared_ping_pong(burn1M) 93.04% 727.72ns 1.37M
2037 // pthrd_rwlock_ping_pong(burn1M) 94.52% 716.30ns 1.40M
2038 // ============================================================================
2040 int main(int argc, char** argv) {
2041 (void)folly_rwspin_reads;
2042 (void)shmtx_wr_pri_reads;
2043 (void)shmtx_w_bare_reads;
2044 (void)shmtx_rd_pri_reads;
2045 (void)shmtx_r_bare_reads;
2046 (void)folly_ticket_reads;
2047 (void)boost_shared_reads;
2048 (void)pthrd_rwlock_reads;
2058 (void)folly_rwspin_ping_pong;
2059 (void)shmtx_w_bare_ping_pong;
2060 (void)shmtx_r_bare_ping_pong;
2061 (void)folly_ticket_ping_pong;
2062 (void)boost_shared_ping_pong;
2063 (void)pthrd_rwlock_ping_pong;
2065 testing::InitGoogleTest(&argc, argv);
2066 gflags::ParseCommandLineFlags(&argc, &argv, true);
2067 int rv = RUN_ALL_TESTS();
2068 folly::runBenchmarksOnFlag();