2 * Copyright 2017 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>
23 #include <boost/optional.hpp>
24 #include <boost/thread/shared_mutex.hpp>
26 #include <folly/Benchmark.h>
27 #include <folly/MPMCQueue.h>
28 #include <folly/RWSpinLock.h>
29 #include <folly/portability/GFlags.h>
30 #include <folly/portability/GTest.h>
31 #include <folly/test/DeterministicSchedule.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 template <typename Lock>
47 SharedMutexToken token1;
48 SharedMutexToken token2;
49 SharedMutexToken token3;
51 EXPECT_TRUE(lock.try_lock());
52 EXPECT_FALSE(lock.try_lock());
53 EXPECT_FALSE(lock.try_lock_shared(token1));
56 EXPECT_TRUE(lock.try_lock_shared(token1));
57 EXPECT_FALSE(lock.try_lock());
58 EXPECT_TRUE(lock.try_lock_shared(token2));
59 lock.lock_shared(token3);
60 lock.unlock_shared(token3);
61 lock.unlock_shared(token2);
62 lock.unlock_shared(token1);
67 lock.lock_shared(token1);
68 lock.lock_shared(token2);
69 lock.unlock_shared(token1);
70 lock.unlock_shared(token2);
73 lock.unlock_and_lock_shared(token1);
74 lock.lock_shared(token2);
75 lock.unlock_shared(token2);
76 lock.unlock_shared(token1);
79 TEST(SharedMutex, basic) {
80 runBasicTest<SharedMutexReadPriority>();
81 runBasicTest<SharedMutexWritePriority>();
84 template <typename Lock>
85 void runBasicHoldersTest() {
87 SharedMutexToken token;
90 // create an exclusive write lock via holder
91 typename Lock::WriteHolder holder(lock);
92 EXPECT_FALSE(lock.try_lock());
93 EXPECT_FALSE(lock.try_lock_shared(token));
95 // move ownership to another write holder via move constructor
96 typename Lock::WriteHolder holder2(std::move(holder));
97 EXPECT_FALSE(lock.try_lock());
98 EXPECT_FALSE(lock.try_lock_shared(token));
100 // move ownership to another write holder via assign operator
101 typename Lock::WriteHolder holder3(nullptr);
102 holder3 = std::move(holder2);
103 EXPECT_FALSE(lock.try_lock());
104 EXPECT_FALSE(lock.try_lock_shared(token));
106 // downgrade from exclusive to upgrade lock via move constructor
107 typename Lock::UpgradeHolder holder4(std::move(holder3));
109 // ensure we can lock from a shared source
110 EXPECT_FALSE(lock.try_lock());
111 EXPECT_TRUE(lock.try_lock_shared(token));
112 lock.unlock_shared(token);
114 // promote from upgrade to exclusive lock via move constructor
115 typename Lock::WriteHolder holder5(std::move(holder4));
116 EXPECT_FALSE(lock.try_lock());
117 EXPECT_FALSE(lock.try_lock_shared(token));
119 // downgrade exclusive to shared lock via move constructor
120 typename Lock::ReadHolder holder6(std::move(holder5));
122 // ensure we can lock from another shared source
123 EXPECT_FALSE(lock.try_lock());
124 EXPECT_TRUE(lock.try_lock_shared(token));
125 lock.unlock_shared(token);
129 typename Lock::WriteHolder holder(lock);
130 EXPECT_FALSE(lock.try_lock());
134 typename Lock::ReadHolder holder(lock);
135 typename Lock::ReadHolder holder2(lock);
136 typename Lock::UpgradeHolder holder3(lock);
140 typename Lock::UpgradeHolder holder(lock);
141 typename Lock::ReadHolder holder2(lock);
142 typename Lock::ReadHolder holder3(std::move(holder));
146 TEST(SharedMutex, basic_holders) {
147 runBasicHoldersTest<SharedMutexReadPriority>();
148 runBasicHoldersTest<SharedMutexWritePriority>();
151 template <typename Lock>
152 void runManyReadLocksTestWithTokens() {
155 vector<SharedMutexToken> tokens;
156 for (int i = 0; i < 1000; ++i) {
157 tokens.emplace_back();
158 EXPECT_TRUE(lock.try_lock_shared(tokens.back()));
160 for (auto& token : tokens) {
161 lock.unlock_shared(token);
163 EXPECT_TRUE(lock.try_lock());
167 TEST(SharedMutex, many_read_locks_with_tokens) {
168 runManyReadLocksTestWithTokens<SharedMutexReadPriority>();
169 runManyReadLocksTestWithTokens<SharedMutexWritePriority>();
172 template <typename Lock>
173 void runManyReadLocksTestWithoutTokens() {
176 for (int i = 0; i < 1000; ++i) {
177 EXPECT_TRUE(lock.try_lock_shared());
179 for (int i = 0; i < 1000; ++i) {
180 lock.unlock_shared();
182 EXPECT_TRUE(lock.try_lock());
186 TEST(SharedMutex, many_read_locks_without_tokens) {
187 runManyReadLocksTestWithoutTokens<SharedMutexReadPriority>();
188 runManyReadLocksTestWithoutTokens<SharedMutexWritePriority>();
191 template <typename Lock>
192 void runTimeoutInPastTest() {
195 EXPECT_TRUE(lock.try_lock_for(milliseconds(0)));
197 EXPECT_TRUE(lock.try_lock_for(milliseconds(-1)));
199 EXPECT_TRUE(lock.try_lock_shared_for(milliseconds(0)));
200 lock.unlock_shared();
201 EXPECT_TRUE(lock.try_lock_shared_for(milliseconds(-1)));
202 lock.unlock_shared();
203 EXPECT_TRUE(lock.try_lock_until(system_clock::now() - milliseconds(1)));
206 lock.try_lock_shared_until(system_clock::now() - milliseconds(1)));
207 lock.unlock_shared();
208 EXPECT_TRUE(lock.try_lock_until(steady_clock::now() - milliseconds(1)));
211 lock.try_lock_shared_until(steady_clock::now() - milliseconds(1)));
212 lock.unlock_shared();
215 TEST(SharedMutex, timeout_in_past) {
216 runTimeoutInPastTest<SharedMutexReadPriority>();
217 runTimeoutInPastTest<SharedMutexWritePriority>();
220 template <class Func>
221 bool funcHasDuration(milliseconds expectedDuration, Func func) {
222 // elapsed time should eventually fall within expectedDuration +- 25%
223 for (int tries = 0; tries < 100; ++tries) {
224 auto start = steady_clock::now();
226 auto elapsed = steady_clock::now() - start;
227 if (elapsed > expectedDuration - expectedDuration / 4 &&
228 elapsed < expectedDuration + expectedDuration / 4) {
235 template <typename Lock>
236 void runFailingTryTimeoutTest() {
239 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
240 EXPECT_FALSE(lock.try_lock_for(milliseconds(10)));
242 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
243 typename Lock::Token token;
244 EXPECT_FALSE(lock.try_lock_shared_for(milliseconds(10), token));
246 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
247 EXPECT_FALSE(lock.try_lock_upgrade_for(milliseconds(10)));
249 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
250 EXPECT_FALSE(lock.try_lock_until(steady_clock::now() + milliseconds(10)));
252 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
253 typename Lock::Token token;
254 EXPECT_FALSE(lock.try_lock_shared_until(
255 steady_clock::now() + milliseconds(10), token));
257 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
259 lock.try_lock_upgrade_until(steady_clock::now() + milliseconds(10)));
261 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
262 EXPECT_FALSE(lock.try_lock_until(system_clock::now() + milliseconds(10)));
264 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
265 typename Lock::Token token;
266 EXPECT_FALSE(lock.try_lock_shared_until(
267 system_clock::now() + milliseconds(10), token));
269 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
271 lock.try_lock_upgrade_until(system_clock::now() + milliseconds(10)));
276 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
277 EXPECT_FALSE(lock.try_lock_for(milliseconds(10)));
279 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
280 EXPECT_FALSE(lock.try_lock_until(steady_clock::now() + milliseconds(10)));
282 EXPECT_TRUE(funcHasDuration(milliseconds(10), [&] {
283 EXPECT_FALSE(lock.try_lock_until(system_clock::now() + milliseconds(10)));
285 lock.unlock_shared();
288 for (int p = 0; p < 8; ++p) {
289 EXPECT_FALSE(lock.try_lock_for(nanoseconds(1 << p)));
293 for (int p = 0; p < 8; ++p) {
294 typename Lock::ReadHolder holder1(lock);
295 typename Lock::ReadHolder holder2(lock);
296 typename Lock::ReadHolder holder3(lock);
297 EXPECT_FALSE(lock.try_lock_for(nanoseconds(1 << p)));
301 TEST(SharedMutex, failing_try_timeout) {
302 runFailingTryTimeoutTest<SharedMutexReadPriority>();
303 runFailingTryTimeoutTest<SharedMutexWritePriority>();
306 template <typename Lock>
307 void runBasicUpgradeTest() {
309 typename Lock::Token token1;
310 typename Lock::Token token2;
313 EXPECT_FALSE(lock.try_lock());
314 EXPECT_TRUE(lock.try_lock_shared(token1));
315 lock.unlock_shared(token1);
316 lock.unlock_upgrade();
319 lock.unlock_upgrade_and_lock();
320 EXPECT_FALSE(lock.try_lock_shared(token1));
324 lock.unlock_upgrade_and_lock_shared(token1);
326 lock.unlock_upgrade_and_lock_shared(token2);
327 lock.unlock_shared(token1);
328 lock.unlock_shared(token2);
331 lock.unlock_and_lock_upgrade();
332 EXPECT_TRUE(lock.try_lock_shared(token1));
333 lock.unlock_upgrade();
334 lock.unlock_shared(token1);
337 TEST(SharedMutex, basic_upgrade_tests) {
338 runBasicUpgradeTest<SharedMutexReadPriority>();
339 runBasicUpgradeTest<SharedMutexWritePriority>();
342 TEST(SharedMutex, read_has_prio) {
343 SharedMutexReadPriority lock;
344 SharedMutexToken token1;
345 SharedMutexToken token2;
346 lock.lock_shared(token1);
347 bool exclusiveAcquired = false;
348 auto writer = thread([&] {
350 exclusiveAcquired = true;
354 // lock() can't complete until we unlock token1, but it should stake
355 // its claim with regards to other exclusive or upgrade locks. We can
356 // use try_lock_upgrade to poll for that eventuality.
357 while (lock.try_lock_upgrade()) {
358 lock.unlock_upgrade();
359 this_thread::yield();
361 EXPECT_FALSE(exclusiveAcquired);
363 // Even though lock() is stuck we should be able to get token2
364 EXPECT_TRUE(lock.try_lock_shared(token2));
365 lock.unlock_shared(token1);
366 lock.unlock_shared(token2);
368 EXPECT_TRUE(exclusiveAcquired);
371 TEST(SharedMutex, write_has_prio) {
372 SharedMutexWritePriority lock;
373 SharedMutexToken token1;
374 SharedMutexToken token2;
375 lock.lock_shared(token1);
376 auto writer = thread([&] {
381 // eventually lock() should block readers
382 while (lock.try_lock_shared(token2)) {
383 lock.unlock_shared(token2);
384 this_thread::yield();
387 lock.unlock_shared(token1);
392 SharedMutexToken token;
394 template <typename T>
399 template <typename T>
400 void unlock(T* lock) {
404 template <typename T>
405 void lock_shared(T* lock) {
406 lock->lock_shared(token);
409 template <typename T>
410 void unlock_shared(T* lock) {
411 lock->unlock_shared(token);
416 template <typename T>
421 template <typename T>
422 void unlock(T* lock) {
426 template <typename T>
427 void lock_shared(T* lock) {
431 template <typename T>
432 void unlock_shared(T* lock) {
433 lock->unlock_shared();
438 template <typename T>
443 template <typename T>
444 void unlock(T* lock) {
448 template <typename T>
449 void lock_shared(T* lock) {
453 template <typename T>
454 void unlock_shared(T* lock) {
460 pthread_rwlock_t lock_;
462 PosixRWLock() { pthread_rwlock_init(&lock_, nullptr); }
464 ~PosixRWLock() { pthread_rwlock_destroy(&lock_); }
466 void lock() { pthread_rwlock_wrlock(&lock_); }
468 void unlock() { pthread_rwlock_unlock(&lock_); }
470 void lock_shared() { pthread_rwlock_rdlock(&lock_); }
472 void unlock_shared() { pthread_rwlock_unlock(&lock_); }
476 pthread_mutex_t lock_;
478 PosixMutex() { pthread_mutex_init(&lock_, nullptr); }
480 ~PosixMutex() { pthread_mutex_destroy(&lock_); }
482 void lock() { pthread_mutex_lock(&lock_); }
484 void unlock() { pthread_mutex_unlock(&lock_); }
486 void lock_shared() { pthread_mutex_lock(&lock_); }
488 void unlock_shared() { pthread_mutex_unlock(&lock_); }
491 template <template <typename> class Atom, typename Lock, typename Locker>
492 static void runContendedReaders(size_t numOps,
494 bool useSeparateLocks) {
498 int valueProtectedByLock = 10;
501 Atom<bool> go(false);
502 Atom<bool>* goPtr = &go; // workaround for clang bug
503 vector<thread> threads(numThreads);
506 for (size_t t = 0; t < numThreads; ++t) {
507 threads[t] = DSched::thread([&, t, numThreads] {
509 Lock* lock = useSeparateLocks ? &privateLock : &globalLock;
511 while (!goPtr->load()) {
512 this_thread::yield();
514 for (size_t op = t; op < numOps; op += numThreads) {
515 locker.lock_shared(lock);
516 // note: folly::doNotOptimizeAway reads and writes to its arg,
517 // so the following two lines are very different than a call
518 // to folly::doNotOptimizeAway(valueProtectedByLock);
519 auto copy = valueProtectedByLock;
520 folly::doNotOptimizeAway(copy);
521 locker.unlock_shared(lock);
528 for (auto& thr : threads) {
533 static void folly_rwspin_reads(uint32_t numOps,
535 bool useSeparateLocks) {
536 runContendedReaders<atomic, RWSpinLock, Locker>(
537 numOps, numThreads, useSeparateLocks);
540 static void shmtx_wr_pri_reads(uint32_t numOps,
542 bool useSeparateLocks) {
543 runContendedReaders<atomic, SharedMutexWritePriority, TokenLocker>(
544 numOps, numThreads, useSeparateLocks);
547 static void shmtx_w_bare_reads(uint32_t numOps,
549 bool useSeparateLocks) {
550 runContendedReaders<atomic, SharedMutexWritePriority, Locker>(
551 numOps, numThreads, useSeparateLocks);
554 static void shmtx_rd_pri_reads(uint32_t numOps,
556 bool useSeparateLocks) {
557 runContendedReaders<atomic, SharedMutexReadPriority, TokenLocker>(
558 numOps, numThreads, useSeparateLocks);
561 static void shmtx_r_bare_reads(uint32_t numOps,
563 bool useSeparateLocks) {
564 runContendedReaders<atomic, SharedMutexReadPriority, Locker>(
565 numOps, numThreads, useSeparateLocks);
568 static void folly_ticket_reads(uint32_t numOps,
570 bool useSeparateLocks) {
571 runContendedReaders<atomic, RWTicketSpinLock64, Locker>(
572 numOps, numThreads, useSeparateLocks);
575 static void boost_shared_reads(uint32_t numOps,
577 bool useSeparateLocks) {
578 runContendedReaders<atomic, boost::shared_mutex, Locker>(
579 numOps, numThreads, useSeparateLocks);
582 static void pthrd_rwlock_reads(uint32_t numOps,
584 bool useSeparateLocks) {
585 runContendedReaders<atomic, PosixRWLock, Locker>(
586 numOps, numThreads, useSeparateLocks);
589 template <template <typename> class Atom, typename Lock, typename Locker>
590 static void runMixed(size_t numOps,
592 double writeFraction,
593 bool useSeparateLocks) {
597 int valueProtectedByLock = 0;
600 Atom<bool> go(false);
601 Atom<bool>* goPtr = &go; // workaround for clang bug
602 vector<thread> threads(numThreads);
605 for (size_t t = 0; t < numThreads; ++t) {
606 threads[t] = DSched::thread([&, t, numThreads] {
607 struct drand48_data buffer;
608 srand48_r(t, &buffer);
609 long writeThreshold = writeFraction * 0x7fffffff;
611 Lock* lock = useSeparateLocks ? &privateLock : &globalLock;
613 while (!goPtr->load()) {
614 this_thread::yield();
616 for (size_t op = t; op < numOps; op += numThreads) {
618 lrand48_r(&buffer, &randVal);
619 bool writeOp = randVal < writeThreshold;
622 if (!useSeparateLocks) {
623 ++valueProtectedByLock;
627 locker.lock_shared(lock);
628 auto v = valueProtectedByLock;
629 folly::doNotOptimizeAway(v);
630 locker.unlock_shared(lock);
638 for (auto& thr : threads) {
643 static void folly_rwspin(size_t numOps,
645 double writeFraction,
646 bool useSeparateLocks) {
647 runMixed<atomic, RWSpinLock, Locker>(
648 numOps, numThreads, writeFraction, useSeparateLocks);
651 static void shmtx_wr_pri(uint32_t numOps,
653 double writeFraction,
654 bool useSeparateLocks) {
655 runMixed<atomic, SharedMutexWritePriority, TokenLocker>(
656 numOps, numThreads, writeFraction, useSeparateLocks);
659 static void shmtx_w_bare(uint32_t numOps,
661 double writeFraction,
662 bool useSeparateLocks) {
663 runMixed<atomic, SharedMutexWritePriority, Locker>(
664 numOps, numThreads, writeFraction, useSeparateLocks);
667 static void shmtx_rd_pri(uint32_t numOps,
669 double writeFraction,
670 bool useSeparateLocks) {
671 runMixed<atomic, SharedMutexReadPriority, TokenLocker>(
672 numOps, numThreads, writeFraction, useSeparateLocks);
675 static void shmtx_r_bare(uint32_t numOps,
677 double writeFraction,
678 bool useSeparateLocks) {
679 runMixed<atomic, SharedMutexReadPriority, Locker>(
680 numOps, numThreads, writeFraction, useSeparateLocks);
683 static void folly_ticket(size_t numOps,
685 double writeFraction,
686 bool useSeparateLocks) {
687 runMixed<atomic, RWTicketSpinLock64, Locker>(
688 numOps, numThreads, writeFraction, useSeparateLocks);
691 static void boost_shared(size_t numOps,
693 double writeFraction,
694 bool useSeparateLocks) {
695 runMixed<atomic, boost::shared_mutex, Locker>(
696 numOps, numThreads, writeFraction, useSeparateLocks);
699 static void pthrd_rwlock(size_t numOps,
701 double writeFraction,
702 bool useSeparateLocks) {
703 runMixed<atomic, PosixRWLock, Locker>(
704 numOps, numThreads, writeFraction, useSeparateLocks);
707 static void pthrd_mutex_(size_t numOps,
709 double writeFraction,
710 bool useSeparateLocks) {
711 runMixed<atomic, PosixMutex, Locker>(
712 numOps, numThreads, writeFraction, useSeparateLocks);
715 template <typename Lock, template <typename> class Atom>
716 static void runAllAndValidate(size_t numOps, size_t numThreads) {
718 Atom<int> globalExclusiveCount(0);
719 Atom<int> globalUpgradeCount(0);
720 Atom<int> globalSharedCount(0);
722 Atom<bool> go(false);
724 // clang crashes on access to Atom<> captured by ref in closure
725 Atom<int>* globalExclusiveCountPtr = &globalExclusiveCount;
726 Atom<int>* globalUpgradeCountPtr = &globalUpgradeCount;
727 Atom<int>* globalSharedCountPtr = &globalSharedCount;
728 Atom<bool>* goPtr = &go;
730 vector<thread> threads(numThreads);
733 for (size_t t = 0; t < numThreads; ++t) {
734 threads[t] = DSched::thread([&, t, numThreads] {
735 struct drand48_data buffer;
736 srand48_r(t, &buffer);
738 bool exclusive = false;
739 bool upgrade = false;
741 bool ourGlobalTokenUsed = false;
742 SharedMutexToken ourGlobalToken;
745 vector<SharedMutexToken> privateTokens;
747 while (!goPtr->load()) {
748 this_thread::yield();
750 for (size_t op = t; op < numOps; op += numThreads) {
751 // randVal in [0,1000)
753 lrand48_r(&buffer, &randVal);
754 randVal = (long)((randVal * (uint64_t)1000) / 0x7fffffff);
756 // make as many assertions as possible about the global state
758 EXPECT_EQ(1, globalExclusiveCountPtr->load(memory_order_acquire));
759 EXPECT_EQ(0, globalUpgradeCountPtr->load(memory_order_acquire));
760 EXPECT_EQ(0, globalSharedCountPtr->load(memory_order_acquire));
763 EXPECT_EQ(0, globalExclusiveCountPtr->load(memory_order_acquire));
764 EXPECT_EQ(1, globalUpgradeCountPtr->load(memory_order_acquire));
767 EXPECT_EQ(0, globalExclusiveCountPtr->load(memory_order_acquire));
768 EXPECT_TRUE(globalSharedCountPtr->load(memory_order_acquire) > 0);
770 EXPECT_FALSE(ourGlobalTokenUsed);
773 // independent 20% chance we do something to the private lock
775 // it's okay to take multiple private shared locks because
776 // we never take an exclusive lock, so reader versus writer
777 // priority doesn't cause deadlocks
778 if (randVal < 100 && privateTokens.size() > 0) {
779 auto i = randVal % privateTokens.size();
780 privateLock.unlock_shared(privateTokens[i]);
781 privateTokens.erase(privateTokens.begin() + i);
783 SharedMutexToken token;
784 privateLock.lock_shared(token);
785 privateTokens.push_back(token);
790 // if we've got a lock, the only thing we can do is release it
791 // or transform it into a different kind of lock
794 --*globalExclusiveCountPtr;
797 } else if (randVal < 700) {
798 globalLock.unlock_and_lock_shared();
799 ++*globalSharedCountPtr;
801 } else if (randVal < 900) {
802 globalLock.unlock_and_lock_shared(ourGlobalToken);
803 ++*globalSharedCountPtr;
805 ourGlobalTokenUsed = true;
807 globalLock.unlock_and_lock_upgrade();
808 ++*globalUpgradeCountPtr;
811 } else if (upgrade) {
813 --*globalUpgradeCountPtr;
815 globalLock.unlock_upgrade();
816 } else if (randVal < 700) {
817 globalLock.unlock_upgrade_and_lock_shared();
818 ++*globalSharedCountPtr;
820 } else if (randVal < 900) {
821 globalLock.unlock_upgrade_and_lock_shared(ourGlobalToken);
822 ++*globalSharedCountPtr;
824 ourGlobalTokenUsed = true;
826 globalLock.unlock_upgrade_and_lock();
827 ++*globalExclusiveCountPtr;
832 --*globalSharedCountPtr;
833 if (ourGlobalTokenUsed) {
834 globalLock.unlock_shared(ourGlobalToken);
835 ourGlobalTokenUsed = false;
837 globalLock.unlock_shared();
839 } else if (randVal < 400) {
840 // 40% chance of shared lock with token, 5 ways to get it
842 // delta t goes from -1 millis to 7 millis
843 auto dt = microseconds(10 * (randVal - 100));
846 globalLock.lock_shared(ourGlobalToken);
848 } else if (randVal < 500) {
849 shared = globalLock.try_lock_shared(ourGlobalToken);
850 } else if (randVal < 600) {
851 shared = globalLock.try_lock_shared_for(dt, ourGlobalToken);
852 } else if (randVal < 800) {
853 shared = globalLock.try_lock_shared_until(
854 system_clock::now() + dt, ourGlobalToken);
857 ourGlobalTokenUsed = true;
858 ++*globalSharedCountPtr;
860 } else if (randVal < 800) {
861 // 40% chance of shared lock without token
862 auto dt = microseconds(10 * (randVal - 100));
864 globalLock.lock_shared();
866 } else if (randVal < 500) {
867 shared = globalLock.try_lock_shared();
868 } else if (randVal < 600) {
869 shared = globalLock.try_lock_shared_for(dt);
870 } else if (randVal < 800) {
871 shared = globalLock.try_lock_shared_until(
872 system_clock::now() + dt);
875 ++*globalSharedCountPtr;
877 } else if (randVal < 900) {
878 // 10% change of upgrade lock
879 globalLock.lock_upgrade();
881 ++*globalUpgradeCountPtr;
883 // 10% chance of exclusive lock, 5 ways to get it
885 // delta t goes from -1 millis to 9 millis
886 auto dt = microseconds(100 * (randVal - 910));
891 } else if (randVal < 500) {
892 exclusive = globalLock.try_lock();
893 } else if (randVal < 600) {
894 exclusive = globalLock.try_lock_for(dt);
895 } else if (randVal < 700) {
896 exclusive = globalLock.try_lock_until(steady_clock::now() + dt);
898 exclusive = globalLock.try_lock_until(system_clock::now() + dt);
901 ++*globalExclusiveCountPtr;
907 --*globalExclusiveCountPtr;
911 --*globalUpgradeCountPtr;
912 globalLock.unlock_upgrade();
915 --*globalSharedCountPtr;
916 if (ourGlobalTokenUsed) {
917 globalLock.unlock_shared(ourGlobalToken);
918 ourGlobalTokenUsed = false;
920 globalLock.unlock_shared();
923 for (auto& token : privateTokens) {
924 privateLock.unlock_shared(token);
931 for (auto& thr : threads) {
936 TEST(SharedMutex, deterministic_concurrent_readers_of_one_lock_read_prio) {
937 for (int pass = 0; pass < 3; ++pass) {
938 DSched sched(DSched::uniform(pass));
939 runContendedReaders<DeterministicAtomic,
940 DSharedMutexReadPriority,
941 Locker>(1000, 3, false);
945 TEST(SharedMutex, deterministic_concurrent_readers_of_one_lock_write_prio) {
946 for (int pass = 0; pass < 3; ++pass) {
947 DSched sched(DSched::uniform(pass));
948 runContendedReaders<DeterministicAtomic,
949 DSharedMutexWritePriority,
950 Locker>(1000, 3, false);
954 TEST(SharedMutex, concurrent_readers_of_one_lock_read_prio) {
955 for (int pass = 0; pass < 10; ++pass) {
956 runContendedReaders<atomic, SharedMutexReadPriority, Locker>(
961 TEST(SharedMutex, concurrent_readers_of_one_lock_write_prio) {
962 for (int pass = 0; pass < 10; ++pass) {
963 runContendedReaders<atomic, SharedMutexWritePriority, Locker>(
968 TEST(SharedMutex, deterministic_readers_of_concurrent_locks_read_prio) {
969 for (int pass = 0; pass < 3; ++pass) {
970 DSched sched(DSched::uniform(pass));
971 runContendedReaders<DeterministicAtomic,
972 DSharedMutexReadPriority,
973 Locker>(1000, 3, true);
977 TEST(SharedMutex, deterministic_readers_of_concurrent_locks_write_prio) {
978 for (int pass = 0; pass < 3; ++pass) {
979 DSched sched(DSched::uniform(pass));
980 runContendedReaders<DeterministicAtomic,
981 DSharedMutexWritePriority,
982 Locker>(1000, 3, true);
986 TEST(SharedMutex, readers_of_concurrent_locks_read_prio) {
987 for (int pass = 0; pass < 10; ++pass) {
988 runContendedReaders<atomic, SharedMutexReadPriority, TokenLocker>(
993 TEST(SharedMutex, readers_of_concurrent_locks_write_prio) {
994 for (int pass = 0; pass < 10; ++pass) {
995 runContendedReaders<atomic, SharedMutexWritePriority, TokenLocker>(
1000 TEST(SharedMutex, deterministic_mixed_mostly_read_read_prio) {
1001 for (int pass = 0; pass < 3; ++pass) {
1002 DSched sched(DSched::uniform(pass));
1003 runMixed<DeterministicAtomic, DSharedMutexReadPriority, Locker>(
1004 1000, 3, 0.1, false);
1008 TEST(SharedMutex, deterministic_mixed_mostly_read_write_prio) {
1009 for (int pass = 0; pass < 3; ++pass) {
1010 DSched sched(DSched::uniform(pass));
1011 runMixed<DeterministicAtomic, DSharedMutexWritePriority, Locker>(
1012 1000, 3, 0.1, false);
1016 TEST(SharedMutex, mixed_mostly_read_read_prio) {
1017 for (int pass = 0; pass < 5; ++pass) {
1018 runMixed<atomic, SharedMutexReadPriority, TokenLocker>(
1019 10000, 32, 0.1, false);
1023 TEST(SharedMutex, mixed_mostly_read_write_prio) {
1024 for (int pass = 0; pass < 5; ++pass) {
1025 runMixed<atomic, SharedMutexWritePriority, TokenLocker>(
1026 10000, 32, 0.1, false);
1030 TEST(SharedMutex, deterministic_mixed_mostly_write_read_prio) {
1031 for (int pass = 0; pass < 1; ++pass) {
1032 DSched sched(DSched::uniform(pass));
1033 runMixed<DeterministicAtomic, DSharedMutexReadPriority, TokenLocker>(
1034 1000, 10, 0.9, false);
1038 TEST(SharedMutex, deterministic_mixed_mostly_write_write_prio) {
1039 for (int pass = 0; pass < 1; ++pass) {
1040 DSched sched(DSched::uniform(pass));
1041 runMixed<DeterministicAtomic, DSharedMutexWritePriority, TokenLocker>(
1042 1000, 10, 0.9, false);
1046 TEST(SharedMutex, deterministic_lost_wakeup_write_prio) {
1047 for (int pass = 0; pass < 10; ++pass) {
1048 DSched sched(DSched::uniformSubset(pass, 2, 200));
1049 runMixed<DeterministicAtomic, DSharedMutexWritePriority, TokenLocker>(
1050 1000, 3, 1.0, false);
1054 TEST(SharedMutex, mixed_mostly_write_read_prio) {
1055 for (int pass = 0; pass < 5; ++pass) {
1056 runMixed<atomic, SharedMutexReadPriority, TokenLocker>(
1057 50000, 300, 0.9, false);
1061 TEST(SharedMutex, mixed_mostly_write_write_prio) {
1062 for (int pass = 0; pass < 5; ++pass) {
1063 runMixed<atomic, SharedMutexWritePriority, TokenLocker>(
1064 50000, 300, 0.9, false);
1068 TEST(SharedMutex, deterministic_all_ops_read_prio) {
1069 for (int pass = 0; pass < 5; ++pass) {
1070 DSched sched(DSched::uniform(pass));
1071 runAllAndValidate<DSharedMutexReadPriority, DeterministicAtomic>(1000, 8);
1075 TEST(SharedMutex, deterministic_all_ops_write_prio) {
1076 for (int pass = 0; pass < 5; ++pass) {
1077 DSched sched(DSched::uniform(pass));
1078 runAllAndValidate<DSharedMutexWritePriority, DeterministicAtomic>(1000, 8);
1082 TEST(SharedMutex, all_ops_read_prio) {
1083 for (int pass = 0; pass < 5; ++pass) {
1084 runAllAndValidate<SharedMutexReadPriority, atomic>(100000, 32);
1088 TEST(SharedMutex, all_ops_write_prio) {
1089 for (int pass = 0; pass < 5; ++pass) {
1090 runAllAndValidate<SharedMutexWritePriority, atomic>(100000, 32);
1094 FOLLY_ASSUME_FBVECTOR_COMPATIBLE(
1095 boost::optional<boost::optional<SharedMutexToken>>)
1097 // Setup is a set of threads that either grab a shared lock, or exclusive
1098 // and then downgrade it, or upgrade then upgrade and downgrade, then
1099 // enqueue the shared lock to a second set of threads that just performs
1100 // unlocks. Half of the shared locks use tokens, the others don't.
1101 template <typename Lock, template <typename> class Atom>
1102 static void runRemoteUnlock(size_t numOps,
1103 double preWriteFraction,
1104 double preUpgradeFraction,
1105 size_t numSendingThreads,
1106 size_t numReceivingThreads) {
1108 MPMCQueue<boost::optional<boost::optional<SharedMutexToken>>, Atom>
1110 auto queuePtr = &queue; // workaround for clang crash
1112 Atom<bool> go(false);
1113 auto goPtr = &go; // workaround for clang crash
1114 Atom<int> pendingSenders(numSendingThreads);
1115 auto pendingSendersPtr = &pendingSenders; // workaround for clang crash
1116 vector<thread> threads(numSendingThreads + numReceivingThreads);
1119 for (size_t t = 0; t < threads.size(); ++t) {
1120 threads[t] = DSched::thread([&, t, numSendingThreads] {
1121 if (t >= numSendingThreads) {
1123 typename decltype(queue)::value_type elem;
1125 queuePtr->blockingRead(elem);
1127 // EOF, pass the EOF token
1128 queuePtr->blockingWrite(std::move(elem));
1132 globalLock.unlock_shared(**elem);
1134 globalLock.unlock_shared();
1139 // else we're a sender
1141 struct drand48_data buffer;
1142 srand48_r(t, &buffer);
1144 while (!goPtr->load()) {
1145 this_thread::yield();
1147 for (size_t op = t; op < numOps; op += numSendingThreads) {
1148 long unscaledRandVal;
1149 lrand48_r(&buffer, &unscaledRandVal);
1152 double randVal = ((double)unscaledRandVal) / 0x7fffffff;
1154 // extract a bit and rescale
1155 bool useToken = randVal >= 0.5;
1156 randVal = (randVal - (useToken ? 0.5 : 0.0)) * 2;
1158 boost::optional<SharedMutexToken> maybeToken;
1161 SharedMutexToken token;
1162 if (randVal < preWriteFraction) {
1164 globalLock.unlock_and_lock_shared(token);
1165 } else if (randVal < preWriteFraction + preUpgradeFraction / 2) {
1166 globalLock.lock_upgrade();
1167 globalLock.unlock_upgrade_and_lock_shared(token);
1168 } else if (randVal < preWriteFraction + preUpgradeFraction) {
1169 globalLock.lock_upgrade();
1170 globalLock.unlock_upgrade_and_lock();
1171 globalLock.unlock_and_lock_shared(token);
1173 globalLock.lock_shared(token);
1177 if (randVal < preWriteFraction) {
1179 globalLock.unlock_and_lock_shared();
1180 } else if (randVal < preWriteFraction + preUpgradeFraction / 2) {
1181 globalLock.lock_upgrade();
1182 globalLock.unlock_upgrade_and_lock_shared();
1183 } else if (randVal < preWriteFraction + preUpgradeFraction) {
1184 globalLock.lock_upgrade();
1185 globalLock.unlock_upgrade_and_lock();
1186 globalLock.unlock_and_lock_shared();
1188 globalLock.lock_shared();
1192 // blockingWrite is emplace-like, so this automatically adds
1193 // another level of wrapping
1194 queuePtr->blockingWrite(maybeToken);
1196 if (--*pendingSendersPtr == 0) {
1197 queuePtr->blockingWrite(boost::none);
1204 for (auto& thr : threads) {
1209 TEST(SharedMutex, deterministic_remote_write_prio) {
1210 for (int pass = 0; pass < 1; ++pass) {
1211 DSched sched(DSched::uniform(pass));
1212 runRemoteUnlock<DSharedMutexWritePriority, DeterministicAtomic>(
1213 500, 0.1, 0.1, 5, 5);
1217 TEST(SharedMutex, deterministic_remote_read_prio) {
1218 for (int pass = 0; pass < 1; ++pass) {
1219 DSched sched(DSched::uniform(pass));
1220 runRemoteUnlock<DSharedMutexReadPriority, DeterministicAtomic>(
1221 500, 0.1, 0.1, 5, 5);
1225 TEST(SharedMutex, remote_write_prio) {
1226 for (int pass = 0; pass < 10; ++pass) {
1227 runRemoteUnlock<SharedMutexWritePriority, atomic>(100000, 0.1, 0.1, 5, 5);
1231 TEST(SharedMutex, remote_read_prio) {
1232 for (int pass = 0; pass < 100; ++pass) {
1233 runRemoteUnlock<SharedMutexReadPriority, atomic>(100000, 0.1, 0.1, 5, 5);
1237 static void burn(size_t n) {
1238 for (size_t i = 0; i < n; ++i) {
1239 folly::doNotOptimizeAway(i);
1243 // Two threads and three locks, arranged so that they have to proceed
1244 // in turn with reader/writer conflict
1245 template <typename Lock, template <typename> class Atom = atomic>
1246 static void runPingPong(size_t numRounds, size_t burnCount) {
1249 pair<Lock, char[56]> locks[3];
1254 auto availPtr = &avail; // workaround for clang crash
1255 Atom<bool> go(false);
1256 auto goPtr = &go; // workaround for clang crash
1257 vector<thread> threads(2);
1259 locks[0].first.lock();
1260 locks[1].first.lock();
1261 locks[2].first.lock_shared();
1264 threads[0] = DSched::thread([&] {
1266 while (!goPtr->load()) {
1267 this_thread::yield();
1269 for (size_t i = 0; i < numRounds; ++i) {
1270 locks[i % 3].first.unlock();
1271 locks[(i + 2) % 3].first.lock();
1275 threads[1] = DSched::thread([&] {
1277 while (!goPtr->load()) {
1278 this_thread::yield();
1280 for (size_t i = 0; i < numRounds; ++i) {
1281 locks[i % 3].first.lock_shared();
1283 locks[(i + 2) % 3].first.unlock_shared();
1287 while (avail.load() < 2) {
1288 this_thread::yield();
1293 for (auto& thr : threads) {
1296 locks[numRounds % 3].first.unlock();
1297 locks[(numRounds + 1) % 3].first.unlock();
1298 locks[(numRounds + 2) % 3].first.unlock_shared();
1301 static void folly_rwspin_ping_pong(size_t n, size_t scale, size_t burnCount) {
1302 runPingPong<RWSpinLock>(n / scale, burnCount);
1305 static void shmtx_w_bare_ping_pong(size_t n, size_t scale, size_t burnCount) {
1306 runPingPong<SharedMutexWritePriority>(n / scale, burnCount);
1309 static void shmtx_r_bare_ping_pong(size_t n, size_t scale, size_t burnCount) {
1310 runPingPong<SharedMutexReadPriority>(n / scale, burnCount);
1313 static void folly_ticket_ping_pong(size_t n, size_t scale, size_t burnCount) {
1314 runPingPong<RWTicketSpinLock64>(n / scale, burnCount);
1317 static void boost_shared_ping_pong(size_t n, size_t scale, size_t burnCount) {
1318 runPingPong<boost::shared_mutex>(n / scale, burnCount);
1321 static void pthrd_rwlock_ping_pong(size_t n, size_t scale, size_t burnCount) {
1322 runPingPong<PosixRWLock>(n / scale, burnCount);
1325 TEST(SharedMutex, deterministic_ping_pong_write_prio) {
1326 for (int pass = 0; pass < 1; ++pass) {
1327 DSched sched(DSched::uniform(pass));
1328 runPingPong<DSharedMutexWritePriority, DeterministicAtomic>(500, 0);
1332 TEST(SharedMutex, deterministic_ping_pong_read_prio) {
1333 for (int pass = 0; pass < 1; ++pass) {
1334 DSched sched(DSched::uniform(pass));
1335 runPingPong<DSharedMutexReadPriority, DeterministicAtomic>(500, 0);
1339 TEST(SharedMutex, ping_pong_write_prio) {
1340 for (int pass = 0; pass < 1; ++pass) {
1341 runPingPong<SharedMutexWritePriority, atomic>(50000, 0);
1345 TEST(SharedMutex, ping_pong_read_prio) {
1346 for (int pass = 0; pass < 1; ++pass) {
1347 runPingPong<SharedMutexReadPriority, atomic>(50000, 0);
1351 // This is here so you can tell how much of the runtime reported by the
1352 // more complex harnesses is due to the harness, although due to the
1353 // magic of compiler optimization it may also be slower
1354 BENCHMARK(single_thread_lock_shared_unlock_shared, iters) {
1356 for (size_t n = 0; n < iters; ++n) {
1357 SharedMutex::Token token;
1358 lock.lock_shared(token);
1359 folly::doNotOptimizeAway(0);
1360 lock.unlock_shared(token);
1364 BENCHMARK(single_thread_lock_unlock, iters) {
1366 for (size_t n = 0; n < iters; ++n) {
1368 folly::doNotOptimizeAway(0);
1373 #define BENCH_BASE(...) FB_VA_GLUE(BENCHMARK_NAMED_PARAM, (__VA_ARGS__))
1374 #define BENCH_REL(...) FB_VA_GLUE(BENCHMARK_RELATIVE_NAMED_PARAM, (__VA_ARGS__))
1376 // 100% reads. Best-case scenario for deferred locks. Lock is colocated
1377 // with read data, so inline lock takes cache miss every time but deferred
1378 // lock has only cache hits and local access.
1379 BENCHMARK_DRAW_LINE()
1380 BENCHMARK_DRAW_LINE()
1381 BENCH_BASE(folly_rwspin_reads, 1thread, 1, false)
1382 BENCH_REL (shmtx_wr_pri_reads, 1thread, 1, false)
1383 BENCH_REL (shmtx_w_bare_reads, 1thread, 1, false)
1384 BENCH_REL (shmtx_rd_pri_reads, 1thread, 1, false)
1385 BENCH_REL (shmtx_r_bare_reads, 1thread, 1, false)
1386 BENCH_REL (folly_ticket_reads, 1thread, 1, false)
1387 BENCH_REL (boost_shared_reads, 1thread, 1, false)
1388 BENCH_REL (pthrd_rwlock_reads, 1thread, 1, false)
1389 BENCHMARK_DRAW_LINE()
1390 BENCH_BASE(folly_rwspin_reads, 2thread, 2, false)
1391 BENCH_REL (shmtx_wr_pri_reads, 2thread, 2, false)
1392 BENCH_REL (shmtx_w_bare_reads, 2thread, 2, false)
1393 BENCH_REL (shmtx_rd_pri_reads, 2thread, 2, false)
1394 BENCH_REL (shmtx_r_bare_reads, 2thread, 2, false)
1395 BENCH_REL (folly_ticket_reads, 2thread, 2, false)
1396 BENCH_REL (boost_shared_reads, 2thread, 2, false)
1397 BENCH_REL (pthrd_rwlock_reads, 2thread, 2, false)
1398 BENCHMARK_DRAW_LINE()
1399 BENCH_BASE(folly_rwspin_reads, 4thread, 4, false)
1400 BENCH_REL (shmtx_wr_pri_reads, 4thread, 4, false)
1401 BENCH_REL (shmtx_w_bare_reads, 4thread, 4, false)
1402 BENCH_REL (shmtx_rd_pri_reads, 4thread, 4, false)
1403 BENCH_REL (shmtx_r_bare_reads, 4thread, 4, false)
1404 BENCH_REL (folly_ticket_reads, 4thread, 4, false)
1405 BENCH_REL (boost_shared_reads, 4thread, 4, false)
1406 BENCH_REL (pthrd_rwlock_reads, 4thread, 4, false)
1407 BENCHMARK_DRAW_LINE()
1408 BENCH_BASE(folly_rwspin_reads, 8thread, 8, false)
1409 BENCH_REL (shmtx_wr_pri_reads, 8thread, 8, false)
1410 BENCH_REL (shmtx_w_bare_reads, 8thread, 8, false)
1411 BENCH_REL (shmtx_rd_pri_reads, 8thread, 8, false)
1412 BENCH_REL (shmtx_r_bare_reads, 8thread, 8, false)
1413 BENCH_REL (folly_ticket_reads, 8thread, 8, false)
1414 BENCH_REL (boost_shared_reads, 8thread, 8, false)
1415 BENCH_REL (pthrd_rwlock_reads, 8thread, 8, false)
1416 BENCHMARK_DRAW_LINE()
1417 BENCH_BASE(folly_rwspin_reads, 16thread, 16, false)
1418 BENCH_REL (shmtx_wr_pri_reads, 16thread, 16, false)
1419 BENCH_REL (shmtx_w_bare_reads, 16thread, 16, false)
1420 BENCH_REL (shmtx_rd_pri_reads, 16thread, 16, false)
1421 BENCH_REL (shmtx_r_bare_reads, 16thread, 16, false)
1422 BENCH_REL (folly_ticket_reads, 16thread, 16, false)
1423 BENCH_REL (boost_shared_reads, 16thread, 16, false)
1424 BENCH_REL (pthrd_rwlock_reads, 16thread, 16, false)
1425 BENCHMARK_DRAW_LINE()
1426 BENCH_BASE(folly_rwspin_reads, 32thread, 32, false)
1427 BENCH_REL (shmtx_wr_pri_reads, 32thread, 32, false)
1428 BENCH_REL (shmtx_w_bare_reads, 32thread, 32, false)
1429 BENCH_REL (shmtx_rd_pri_reads, 32thread, 32, false)
1430 BENCH_REL (shmtx_r_bare_reads, 32thread, 32, false)
1431 BENCH_REL (folly_ticket_reads, 32thread, 32, false)
1432 BENCH_REL (boost_shared_reads, 32thread, 32, false)
1433 BENCH_REL (pthrd_rwlock_reads, 32thread, 32, false)
1434 BENCHMARK_DRAW_LINE()
1435 BENCH_BASE(folly_rwspin_reads, 64thread, 64, false)
1436 BENCH_REL (shmtx_wr_pri_reads, 64thread, 64, false)
1437 BENCH_REL (shmtx_w_bare_reads, 64thread, 64, false)
1438 BENCH_REL (shmtx_rd_pri_reads, 64thread, 64, false)
1439 BENCH_REL (shmtx_r_bare_reads, 64thread, 64, false)
1440 BENCH_REL (folly_ticket_reads, 64thread, 64, false)
1441 BENCH_REL (boost_shared_reads, 64thread, 64, false)
1442 BENCH_REL (pthrd_rwlock_reads, 64thread, 64, false)
1444 // 1 lock used by everybody, 100% writes. Threads only hurt, but it is
1445 // good to not fail catastrophically. Compare to single_thread_lock_unlock
1446 // to see the overhead of the generic driver (and its pseudo-random number
1447 // generator). pthrd_mutex_ is a pthread_mutex_t (default, not adaptive),
1448 // which is better than any of the reader-writer locks for this scenario.
1449 BENCHMARK_DRAW_LINE()
1450 BENCHMARK_DRAW_LINE()
1451 BENCH_BASE(folly_rwspin, 1thread_all_write, 1, 1.0, false)
1452 BENCH_REL (shmtx_wr_pri, 1thread_all_write, 1, 1.0, false)
1453 BENCH_REL (shmtx_rd_pri, 1thread_all_write, 1, 1.0, false)
1454 BENCH_REL (folly_ticket, 1thread_all_write, 1, 1.0, false)
1455 BENCH_REL (boost_shared, 1thread_all_write, 1, 1.0, false)
1456 BENCH_REL (pthrd_rwlock, 1thread_all_write, 1, 1.0, false)
1457 BENCH_REL (pthrd_mutex_, 1thread_all_write, 1, 1.0, false)
1458 BENCHMARK_DRAW_LINE()
1459 BENCH_BASE(folly_rwspin, 2thread_all_write, 2, 1.0, false)
1460 BENCH_REL (shmtx_wr_pri, 2thread_all_write, 2, 1.0, false)
1461 BENCH_REL (shmtx_rd_pri, 2thread_all_write, 2, 1.0, false)
1462 BENCH_REL (folly_ticket, 2thread_all_write, 2, 1.0, false)
1463 BENCH_REL (boost_shared, 2thread_all_write, 2, 1.0, false)
1464 BENCH_REL (pthrd_rwlock, 2thread_all_write, 2, 1.0, false)
1465 BENCH_REL (pthrd_mutex_, 2thread_all_write, 2, 1.0, false)
1466 BENCHMARK_DRAW_LINE()
1467 BENCH_BASE(folly_rwspin, 4thread_all_write, 4, 1.0, false)
1468 BENCH_REL (shmtx_wr_pri, 4thread_all_write, 4, 1.0, false)
1469 BENCH_REL (shmtx_rd_pri, 4thread_all_write, 4, 1.0, false)
1470 BENCH_REL (folly_ticket, 4thread_all_write, 4, 1.0, false)
1471 BENCH_REL (boost_shared, 4thread_all_write, 4, 1.0, false)
1472 BENCH_REL (pthrd_rwlock, 4thread_all_write, 4, 1.0, false)
1473 BENCH_REL (pthrd_mutex_, 4thread_all_write, 4, 1.0, false)
1474 BENCHMARK_DRAW_LINE()
1475 BENCH_BASE(folly_rwspin, 8thread_all_write, 8, 1.0, false)
1476 BENCH_REL (shmtx_wr_pri, 8thread_all_write, 8, 1.0, false)
1477 BENCH_REL (shmtx_rd_pri, 8thread_all_write, 8, 1.0, false)
1478 BENCH_REL (folly_ticket, 8thread_all_write, 8, 1.0, false)
1479 BENCH_REL (boost_shared, 8thread_all_write, 8, 1.0, false)
1480 BENCH_REL (pthrd_rwlock, 8thread_all_write, 8, 1.0, false)
1481 BENCH_REL (pthrd_mutex_, 8thread_all_write, 8, 1.0, false)
1482 BENCHMARK_DRAW_LINE()
1483 BENCH_BASE(folly_rwspin, 16thread_all_write, 16, 1.0, false)
1484 BENCH_REL (shmtx_wr_pri, 16thread_all_write, 16, 1.0, false)
1485 BENCH_REL (shmtx_rd_pri, 16thread_all_write, 16, 1.0, false)
1486 BENCH_REL (folly_ticket, 16thread_all_write, 16, 1.0, false)
1487 BENCH_REL (boost_shared, 16thread_all_write, 16, 1.0, false)
1488 BENCH_REL (pthrd_rwlock, 16thread_all_write, 16, 1.0, false)
1489 BENCH_REL (pthrd_mutex_, 16thread_all_write, 16, 1.0, false)
1490 BENCHMARK_DRAW_LINE()
1491 BENCH_BASE(folly_rwspin, 32thread_all_write, 32, 1.0, false)
1492 BENCH_REL (shmtx_wr_pri, 32thread_all_write, 32, 1.0, false)
1493 BENCH_REL (shmtx_rd_pri, 32thread_all_write, 32, 1.0, false)
1494 BENCH_REL (folly_ticket, 32thread_all_write, 32, 1.0, false)
1495 BENCH_REL (boost_shared, 32thread_all_write, 32, 1.0, false)
1496 BENCH_REL (pthrd_rwlock, 32thread_all_write, 32, 1.0, false)
1497 BENCH_REL (pthrd_mutex_, 32thread_all_write, 32, 1.0, false)
1498 BENCHMARK_DRAW_LINE()
1499 BENCH_BASE(folly_rwspin, 64thread_all_write, 64, 1.0, false)
1500 BENCH_REL (shmtx_wr_pri, 64thread_all_write, 64, 1.0, false)
1501 BENCH_REL (shmtx_rd_pri, 64thread_all_write, 64, 1.0, false)
1502 BENCH_REL (folly_ticket, 64thread_all_write, 64, 1.0, false)
1503 BENCH_REL (boost_shared, 64thread_all_write, 64, 1.0, false)
1504 BENCH_REL (pthrd_rwlock, 64thread_all_write, 64, 1.0, false)
1505 BENCH_REL (pthrd_mutex_, 64thread_all_write, 64, 1.0, false)
1507 // 1 lock used by everybody, 10% writes. Not much scaling to be had. Perf
1508 // is best at 1 thread, once you've got multiple threads > 8 threads hurts.
1509 BENCHMARK_DRAW_LINE()
1510 BENCHMARK_DRAW_LINE()
1511 BENCH_BASE(folly_rwspin, 1thread_10pct_write, 1, 0.10, false)
1512 BENCH_REL (shmtx_wr_pri, 1thread_10pct_write, 1, 0.10, false)
1513 BENCH_REL (shmtx_rd_pri, 1thread_10pct_write, 1, 0.10, false)
1514 BENCH_REL (folly_ticket, 1thread_10pct_write, 1, 0.10, false)
1515 BENCH_REL (boost_shared, 1thread_10pct_write, 1, 0.10, false)
1516 BENCH_REL (pthrd_rwlock, 1thread_10pct_write, 1, 0.10, false)
1517 BENCHMARK_DRAW_LINE()
1518 BENCH_BASE(folly_rwspin, 2thread_10pct_write, 2, 0.10, false)
1519 BENCH_REL (shmtx_wr_pri, 2thread_10pct_write, 2, 0.10, false)
1520 BENCH_REL (shmtx_rd_pri, 2thread_10pct_write, 2, 0.10, false)
1521 BENCH_REL (folly_ticket, 2thread_10pct_write, 2, 0.10, false)
1522 BENCH_REL (boost_shared, 2thread_10pct_write, 2, 0.10, false)
1523 BENCH_REL (pthrd_rwlock, 2thread_10pct_write, 2, 0.10, false)
1524 BENCHMARK_DRAW_LINE()
1525 BENCH_BASE(folly_rwspin, 4thread_10pct_write, 4, 0.10, false)
1526 BENCH_REL (shmtx_wr_pri, 4thread_10pct_write, 4, 0.10, false)
1527 BENCH_REL (shmtx_rd_pri, 4thread_10pct_write, 4, 0.10, false)
1528 BENCH_REL (folly_ticket, 4thread_10pct_write, 4, 0.10, false)
1529 BENCH_REL (boost_shared, 4thread_10pct_write, 4, 0.10, false)
1530 BENCH_REL (pthrd_rwlock, 4thread_10pct_write, 4, 0.10, false)
1531 BENCHMARK_DRAW_LINE()
1532 BENCH_BASE(folly_rwspin, 8thread_10pct_write, 8, 0.10, false)
1533 BENCH_REL (shmtx_wr_pri, 8thread_10pct_write, 8, 0.10, false)
1534 BENCH_REL (shmtx_rd_pri, 8thread_10pct_write, 8, 0.10, false)
1535 BENCH_REL (folly_ticket, 8thread_10pct_write, 8, 0.10, false)
1536 BENCH_REL (boost_shared, 8thread_10pct_write, 8, 0.10, false)
1537 BENCH_REL (pthrd_rwlock, 8thread_10pct_write, 8, 0.10, false)
1538 BENCHMARK_DRAW_LINE()
1539 BENCH_BASE(folly_rwspin, 16thread_10pct_write, 16, 0.10, false)
1540 BENCH_REL (shmtx_wr_pri, 16thread_10pct_write, 16, 0.10, false)
1541 BENCH_REL (shmtx_rd_pri, 16thread_10pct_write, 16, 0.10, false)
1542 BENCH_REL (folly_ticket, 16thread_10pct_write, 16, 0.10, false)
1543 BENCH_REL (boost_shared, 16thread_10pct_write, 16, 0.10, false)
1544 BENCH_REL (pthrd_rwlock, 16thread_10pct_write, 16, 0.10, false)
1545 BENCHMARK_DRAW_LINE()
1546 BENCH_BASE(folly_rwspin, 32thread_10pct_write, 32, 0.10, false)
1547 BENCH_REL (shmtx_wr_pri, 32thread_10pct_write, 32, 0.10, false)
1548 BENCH_REL (shmtx_rd_pri, 32thread_10pct_write, 32, 0.10, false)
1549 BENCH_REL (folly_ticket, 32thread_10pct_write, 32, 0.10, false)
1550 BENCH_REL (boost_shared, 32thread_10pct_write, 32, 0.10, false)
1551 BENCH_REL (pthrd_rwlock, 32thread_10pct_write, 32, 0.10, false)
1552 BENCHMARK_DRAW_LINE()
1553 BENCH_BASE(folly_rwspin, 64thread_10pct_write, 64, 0.10, false)
1554 BENCH_REL (shmtx_wr_pri, 64thread_10pct_write, 64, 0.10, false)
1555 BENCH_REL (shmtx_rd_pri, 64thread_10pct_write, 64, 0.10, false)
1556 BENCH_REL (folly_ticket, 64thread_10pct_write, 64, 0.10, false)
1557 BENCH_REL (boost_shared, 64thread_10pct_write, 64, 0.10, false)
1558 BENCH_REL (pthrd_rwlock, 64thread_10pct_write, 64, 0.10, false)
1560 // 1 lock used by everybody, 1% writes. This is a more realistic example
1561 // than the concurrent_*_reads benchmark, but still shows SharedMutex locks
1562 // winning over all of the others
1563 BENCHMARK_DRAW_LINE()
1564 BENCHMARK_DRAW_LINE()
1565 BENCH_BASE(folly_rwspin, 1thread_1pct_write, 1, 0.01, false)
1566 BENCH_REL (shmtx_wr_pri, 1thread_1pct_write, 1, 0.01, false)
1567 BENCH_REL (shmtx_w_bare, 1thread_1pct_write, 1, 0.01, false)
1568 BENCH_REL (shmtx_rd_pri, 1thread_1pct_write, 1, 0.01, false)
1569 BENCH_REL (shmtx_r_bare, 1thread_1pct_write, 1, 0.01, false)
1570 BENCH_REL (folly_ticket, 1thread_1pct_write, 1, 0.01, false)
1571 BENCH_REL (boost_shared, 1thread_1pct_write, 1, 0.01, false)
1572 BENCH_REL (pthrd_rwlock, 1thread_1pct_write, 1, 0.01, false)
1573 BENCHMARK_DRAW_LINE()
1574 BENCH_BASE(folly_rwspin, 2thread_1pct_write, 2, 0.01, false)
1575 BENCH_REL (shmtx_wr_pri, 2thread_1pct_write, 2, 0.01, false)
1576 BENCH_REL (shmtx_w_bare, 2thread_1pct_write, 2, 0.01, false)
1577 BENCH_REL (shmtx_rd_pri, 2thread_1pct_write, 2, 0.01, false)
1578 BENCH_REL (shmtx_r_bare, 2thread_1pct_write, 2, 0.01, false)
1579 BENCH_REL (folly_ticket, 2thread_1pct_write, 2, 0.01, false)
1580 BENCH_REL (boost_shared, 2thread_1pct_write, 2, 0.01, false)
1581 BENCH_REL (pthrd_rwlock, 2thread_1pct_write, 2, 0.01, false)
1582 BENCHMARK_DRAW_LINE()
1583 BENCH_BASE(folly_rwspin, 4thread_1pct_write, 4, 0.01, false)
1584 BENCH_REL (shmtx_wr_pri, 4thread_1pct_write, 4, 0.01, false)
1585 BENCH_REL (shmtx_w_bare, 4thread_1pct_write, 4, 0.01, false)
1586 BENCH_REL (shmtx_rd_pri, 4thread_1pct_write, 4, 0.01, false)
1587 BENCH_REL (shmtx_r_bare, 4thread_1pct_write, 4, 0.01, false)
1588 BENCH_REL (folly_ticket, 4thread_1pct_write, 4, 0.01, false)
1589 BENCH_REL (boost_shared, 4thread_1pct_write, 4, 0.01, false)
1590 BENCH_REL (pthrd_rwlock, 4thread_1pct_write, 4, 0.01, false)
1591 BENCHMARK_DRAW_LINE()
1592 BENCH_BASE(folly_rwspin, 8thread_1pct_write, 8, 0.01, false)
1593 BENCH_REL (shmtx_wr_pri, 8thread_1pct_write, 8, 0.01, false)
1594 BENCH_REL (shmtx_w_bare, 8thread_1pct_write, 8, 0.01, false)
1595 BENCH_REL (shmtx_rd_pri, 8thread_1pct_write, 8, 0.01, false)
1596 BENCH_REL (shmtx_r_bare, 8thread_1pct_write, 8, 0.01, false)
1597 BENCH_REL (folly_ticket, 8thread_1pct_write, 8, 0.01, false)
1598 BENCH_REL (boost_shared, 8thread_1pct_write, 8, 0.01, false)
1599 BENCH_REL (pthrd_rwlock, 8thread_1pct_write, 8, 0.01, false)
1600 BENCHMARK_DRAW_LINE()
1601 BENCH_BASE(folly_rwspin, 16thread_1pct_write, 16, 0.01, false)
1602 BENCH_REL (shmtx_wr_pri, 16thread_1pct_write, 16, 0.01, false)
1603 BENCH_REL (shmtx_w_bare, 16thread_1pct_write, 16, 0.01, false)
1604 BENCH_REL (shmtx_rd_pri, 16thread_1pct_write, 16, 0.01, false)
1605 BENCH_REL (shmtx_r_bare, 16thread_1pct_write, 16, 0.01, false)
1606 BENCH_REL (folly_ticket, 16thread_1pct_write, 16, 0.01, false)
1607 BENCH_REL (boost_shared, 16thread_1pct_write, 16, 0.01, false)
1608 BENCH_REL (pthrd_rwlock, 16thread_1pct_write, 16, 0.01, false)
1609 BENCHMARK_DRAW_LINE()
1610 BENCH_BASE(folly_rwspin, 32thread_1pct_write, 32, 0.01, false)
1611 BENCH_REL (shmtx_wr_pri, 32thread_1pct_write, 32, 0.01, false)
1612 BENCH_REL (shmtx_w_bare, 32thread_1pct_write, 32, 0.01, false)
1613 BENCH_REL (shmtx_rd_pri, 32thread_1pct_write, 32, 0.01, false)
1614 BENCH_REL (shmtx_r_bare, 32thread_1pct_write, 32, 0.01, false)
1615 BENCH_REL (folly_ticket, 32thread_1pct_write, 32, 0.01, false)
1616 BENCH_REL (boost_shared, 32thread_1pct_write, 32, 0.01, false)
1617 BENCH_REL (pthrd_rwlock, 32thread_1pct_write, 32, 0.01, false)
1618 BENCHMARK_DRAW_LINE()
1619 BENCH_BASE(folly_rwspin, 64thread_1pct_write, 64, 0.01, false)
1620 BENCH_REL (shmtx_wr_pri, 64thread_1pct_write, 64, 0.01, false)
1621 BENCH_REL (shmtx_w_bare, 64thread_1pct_write, 64, 0.01, false)
1622 BENCH_REL (shmtx_rd_pri, 64thread_1pct_write, 64, 0.01, false)
1623 BENCH_REL (shmtx_r_bare, 64thread_1pct_write, 64, 0.01, false)
1624 BENCH_REL (folly_ticket, 64thread_1pct_write, 64, 0.01, false)
1625 BENCH_REL (boost_shared, 64thread_1pct_write, 64, 0.01, false)
1626 BENCH_REL (pthrd_rwlock, 64thread_1pct_write, 64, 0.01, false)
1628 // Worst case scenario for deferred locks. No actual sharing, likely that
1629 // read operations will have to first set the kDeferredReadersPossibleBit,
1630 // and likely that writers will have to scan deferredReaders[].
1631 BENCHMARK_DRAW_LINE()
1632 BENCH_BASE(folly_rwspin, 2thr_2lock_50pct_write, 2, 0.50, true)
1633 BENCH_REL (shmtx_wr_pri, 2thr_2lock_50pct_write, 2, 0.50, true)
1634 BENCH_REL (shmtx_rd_pri, 2thr_2lock_50pct_write, 2, 0.50, true)
1635 BENCH_BASE(folly_rwspin, 4thr_4lock_50pct_write, 4, 0.50, true)
1636 BENCH_REL (shmtx_wr_pri, 4thr_4lock_50pct_write, 4, 0.50, true)
1637 BENCH_REL (shmtx_rd_pri, 4thr_4lock_50pct_write, 4, 0.50, true)
1638 BENCH_BASE(folly_rwspin, 8thr_8lock_50pct_write, 8, 0.50, true)
1639 BENCH_REL (shmtx_wr_pri, 8thr_8lock_50pct_write, 8, 0.50, true)
1640 BENCH_REL (shmtx_rd_pri, 8thr_8lock_50pct_write, 8, 0.50, true)
1641 BENCH_BASE(folly_rwspin, 16thr_16lock_50pct_write, 16, 0.50, true)
1642 BENCH_REL (shmtx_wr_pri, 16thr_16lock_50pct_write, 16, 0.50, true)
1643 BENCH_REL (shmtx_rd_pri, 16thr_16lock_50pct_write, 16, 0.50, true)
1644 BENCH_BASE(folly_rwspin, 32thr_32lock_50pct_write, 32, 0.50, true)
1645 BENCH_REL (shmtx_wr_pri, 32thr_32lock_50pct_write, 32, 0.50, true)
1646 BENCH_REL (shmtx_rd_pri, 32thr_32lock_50pct_write, 32, 0.50, true)
1647 BENCH_BASE(folly_rwspin, 64thr_64lock_50pct_write, 64, 0.50, true)
1648 BENCH_REL (shmtx_wr_pri, 64thr_64lock_50pct_write, 64, 0.50, true)
1649 BENCH_REL (shmtx_rd_pri, 64thr_64lock_50pct_write, 64, 0.50, true)
1650 BENCHMARK_DRAW_LINE()
1651 BENCH_BASE(folly_rwspin, 2thr_2lock_10pct_write, 2, 0.10, true)
1652 BENCH_REL (shmtx_wr_pri, 2thr_2lock_10pct_write, 2, 0.10, true)
1653 BENCH_REL (shmtx_rd_pri, 2thr_2lock_10pct_write, 2, 0.10, true)
1654 BENCH_BASE(folly_rwspin, 4thr_4lock_10pct_write, 4, 0.10, true)
1655 BENCH_REL (shmtx_wr_pri, 4thr_4lock_10pct_write, 4, 0.10, true)
1656 BENCH_REL (shmtx_rd_pri, 4thr_4lock_10pct_write, 4, 0.10, true)
1657 BENCH_BASE(folly_rwspin, 8thr_8lock_10pct_write, 8, 0.10, true)
1658 BENCH_REL (shmtx_wr_pri, 8thr_8lock_10pct_write, 8, 0.10, true)
1659 BENCH_REL (shmtx_rd_pri, 8thr_8lock_10pct_write, 8, 0.10, true)
1660 BENCH_BASE(folly_rwspin, 16thr_16lock_10pct_write, 16, 0.10, true)
1661 BENCH_REL (shmtx_wr_pri, 16thr_16lock_10pct_write, 16, 0.10, true)
1662 BENCH_REL (shmtx_rd_pri, 16thr_16lock_10pct_write, 16, 0.10, true)
1663 BENCH_BASE(folly_rwspin, 32thr_32lock_10pct_write, 32, 0.10, true)
1664 BENCH_REL (shmtx_wr_pri, 32thr_32lock_10pct_write, 32, 0.10, true)
1665 BENCH_REL (shmtx_rd_pri, 32thr_32lock_10pct_write, 32, 0.10, true)
1666 BENCH_BASE(folly_rwspin, 64thr_64lock_10pct_write, 64, 0.10, true)
1667 BENCH_REL (shmtx_wr_pri, 64thr_64lock_10pct_write, 64, 0.10, true)
1668 BENCH_REL (shmtx_rd_pri, 64thr_64lock_10pct_write, 64, 0.10, true)
1669 BENCHMARK_DRAW_LINE()
1670 BENCH_BASE(folly_rwspin, 2thr_2lock_1pct_write, 2, 0.01, true)
1671 BENCH_REL (shmtx_wr_pri, 2thr_2lock_1pct_write, 2, 0.01, true)
1672 BENCH_REL (shmtx_rd_pri, 2thr_2lock_1pct_write, 2, 0.01, true)
1673 BENCH_BASE(folly_rwspin, 4thr_4lock_1pct_write, 4, 0.01, true)
1674 BENCH_REL (shmtx_wr_pri, 4thr_4lock_1pct_write, 4, 0.01, true)
1675 BENCH_REL (shmtx_rd_pri, 4thr_4lock_1pct_write, 4, 0.01, true)
1676 BENCH_BASE(folly_rwspin, 8thr_8lock_1pct_write, 8, 0.01, true)
1677 BENCH_REL (shmtx_wr_pri, 8thr_8lock_1pct_write, 8, 0.01, true)
1678 BENCH_REL (shmtx_rd_pri, 8thr_8lock_1pct_write, 8, 0.01, true)
1679 BENCH_BASE(folly_rwspin, 16thr_16lock_1pct_write, 16, 0.01, true)
1680 BENCH_REL (shmtx_wr_pri, 16thr_16lock_1pct_write, 16, 0.01, true)
1681 BENCH_REL (shmtx_rd_pri, 16thr_16lock_1pct_write, 16, 0.01, true)
1682 BENCH_BASE(folly_rwspin, 32thr_32lock_1pct_write, 32, 0.01, true)
1683 BENCH_REL (shmtx_wr_pri, 32thr_32lock_1pct_write, 32, 0.01, true)
1684 BENCH_REL (shmtx_rd_pri, 32thr_32lock_1pct_write, 32, 0.01, true)
1685 BENCH_BASE(folly_rwspin, 64thr_64lock_1pct_write, 64, 0.01, true)
1686 BENCH_REL (shmtx_wr_pri, 64thr_64lock_1pct_write, 64, 0.01, true)
1687 BENCH_REL (shmtx_rd_pri, 64thr_64lock_1pct_write, 64, 0.01, true)
1689 // Ping-pong tests have a scaled number of iterations, because their burn
1690 // loop would make them too slow otherwise. Ping-pong with burn count of
1691 // 100k or 300k shows the advantage of soft-spin, reducing the cost of
1692 // each wakeup by about 20 usec. (Take benchmark reported difference,
1693 // ~400 nanos, multiply by the scale of 100, then divide by 2 because
1694 // each round has two wakeups.)
1695 BENCHMARK_DRAW_LINE()
1696 BENCHMARK_DRAW_LINE()
1697 BENCH_BASE(folly_rwspin_ping_pong, burn0, 1, 0)
1698 BENCH_REL (shmtx_w_bare_ping_pong, burn0, 1, 0)
1699 BENCH_REL (shmtx_r_bare_ping_pong, burn0, 1, 0)
1700 BENCH_REL (folly_ticket_ping_pong, burn0, 1, 0)
1701 BENCH_REL (boost_shared_ping_pong, burn0, 1, 0)
1702 BENCH_REL (pthrd_rwlock_ping_pong, burn0, 1, 0)
1703 BENCHMARK_DRAW_LINE()
1704 BENCH_BASE(folly_rwspin_ping_pong, burn100k, 100, 100000)
1705 BENCH_REL (shmtx_w_bare_ping_pong, burn100k, 100, 100000)
1706 BENCH_REL (shmtx_r_bare_ping_pong, burn100k, 100, 100000)
1707 BENCH_REL (folly_ticket_ping_pong, burn100k, 100, 100000)
1708 BENCH_REL (boost_shared_ping_pong, burn100k, 100, 100000)
1709 BENCH_REL (pthrd_rwlock_ping_pong, burn100k, 100, 100000)
1710 BENCHMARK_DRAW_LINE()
1711 BENCH_BASE(folly_rwspin_ping_pong, burn300k, 100, 300000)
1712 BENCH_REL (shmtx_w_bare_ping_pong, burn300k, 100, 300000)
1713 BENCH_REL (shmtx_r_bare_ping_pong, burn300k, 100, 300000)
1714 BENCH_REL (folly_ticket_ping_pong, burn300k, 100, 300000)
1715 BENCH_REL (boost_shared_ping_pong, burn300k, 100, 300000)
1716 BENCH_REL (pthrd_rwlock_ping_pong, burn300k, 100, 300000)
1717 BENCHMARK_DRAW_LINE()
1718 BENCH_BASE(folly_rwspin_ping_pong, burn1M, 1000, 1000000)
1719 BENCH_REL (shmtx_w_bare_ping_pong, burn1M, 1000, 1000000)
1720 BENCH_REL (shmtx_r_bare_ping_pong, burn1M, 1000, 1000000)
1721 BENCH_REL (folly_ticket_ping_pong, burn1M, 1000, 1000000)
1722 BENCH_REL (boost_shared_ping_pong, burn1M, 1000, 1000000)
1723 BENCH_REL (pthrd_rwlock_ping_pong, burn1M, 1000, 1000000)
1725 // Reproduce with 10 minutes and
1727 // shared_mutex_test --benchmark --bm_min_iters=1000000
1729 // Comparison use folly::RWSpinLock as the baseline, with the
1730 // following row being the default SharedMutex (using *Holder or
1731 // Token-ful methods).
1733 // Following results on 2-socket Intel(R) Xeon(R) CPU E5-2660 0 @ 2.20GHz
1735 // ============================================================================
1736 // folly/test/SharedMutexTest.cpp relative time/iter iters/s
1737 // ============================================================================
1738 // single_thread_lock_shared_unlock_shared 25.17ns 39.74M
1739 // single_thread_lock_unlock 25.88ns 38.64M
1740 // ----------------------------------------------------------------------------
1741 // ----------------------------------------------------------------------------
1742 // folly_rwspin_reads(1thread) 15.16ns 65.95M
1743 // shmtx_wr_pri_reads(1thread) 69.18% 21.92ns 45.63M
1744 // shmtx_w_bare_reads(1thread) 56.07% 27.04ns 36.98M
1745 // shmtx_rd_pri_reads(1thread) 69.06% 21.95ns 45.55M
1746 // shmtx_r_bare_reads(1thread) 56.36% 26.90ns 37.17M
1747 // folly_ticket_reads(1thread) 57.56% 26.34ns 37.96M
1748 // boost_shared_reads(1thread) 10.55% 143.72ns 6.96M
1749 // pthrd_rwlock_reads(1thread) 39.61% 38.28ns 26.12M
1750 // ----------------------------------------------------------------------------
1751 // folly_rwspin_reads(2thread) 45.05ns 22.20M
1752 // shmtx_wr_pri_reads(2thread) 379.98% 11.86ns 84.34M
1753 // shmtx_w_bare_reads(2thread) 319.27% 14.11ns 70.87M
1754 // shmtx_rd_pri_reads(2thread) 385.59% 11.68ns 85.59M
1755 // shmtx_r_bare_reads(2thread) 306.56% 14.70ns 68.04M
1756 // folly_ticket_reads(2thread) 61.07% 73.78ns 13.55M
1757 // boost_shared_reads(2thread) 13.54% 332.66ns 3.01M
1758 // pthrd_rwlock_reads(2thread) 34.22% 131.65ns 7.60M
1759 // ----------------------------------------------------------------------------
1760 // folly_rwspin_reads(4thread) 62.19ns 16.08M
1761 // shmtx_wr_pri_reads(4thread) 1022.82% 6.08ns 164.48M
1762 // shmtx_w_bare_reads(4thread) 875.37% 7.10ns 140.76M
1763 // shmtx_rd_pri_reads(4thread) 1060.46% 5.86ns 170.53M
1764 // shmtx_r_bare_reads(4thread) 879.88% 7.07ns 141.49M
1765 // folly_ticket_reads(4thread) 64.62% 96.23ns 10.39M
1766 // boost_shared_reads(4thread) 14.86% 418.49ns 2.39M
1767 // pthrd_rwlock_reads(4thread) 25.01% 248.65ns 4.02M
1768 // ----------------------------------------------------------------------------
1769 // folly_rwspin_reads(8thread) 64.09ns 15.60M
1770 // shmtx_wr_pri_reads(8thread) 2191.99% 2.92ns 342.03M
1771 // shmtx_w_bare_reads(8thread) 1804.92% 3.55ns 281.63M
1772 // shmtx_rd_pri_reads(8thread) 2194.60% 2.92ns 342.44M
1773 // shmtx_r_bare_reads(8thread) 1800.53% 3.56ns 280.95M
1774 // folly_ticket_reads(8thread) 54.90% 116.74ns 8.57M
1775 // boost_shared_reads(8thread) 18.25% 351.24ns 2.85M
1776 // pthrd_rwlock_reads(8thread) 28.19% 227.31ns 4.40M
1777 // ----------------------------------------------------------------------------
1778 // folly_rwspin_reads(16thread) 70.06ns 14.27M
1779 // shmtx_wr_pri_reads(16thread) 4970.09% 1.41ns 709.38M
1780 // shmtx_w_bare_reads(16thread) 4143.75% 1.69ns 591.44M
1781 // shmtx_rd_pri_reads(16thread) 5009.31% 1.40ns 714.98M
1782 // shmtx_r_bare_reads(16thread) 4067.36% 1.72ns 580.54M
1783 // folly_ticket_reads(16thread) 46.78% 149.77ns 6.68M
1784 // boost_shared_reads(16thread) 21.67% 323.37ns 3.09M
1785 // pthrd_rwlock_reads(16thread) 35.05% 199.90ns 5.00M
1786 // ----------------------------------------------------------------------------
1787 // folly_rwspin_reads(32thread) 58.83ns 17.00M
1788 // shmtx_wr_pri_reads(32thread) 5158.37% 1.14ns 876.79M
1789 // shmtx_w_bare_reads(32thread) 4246.03% 1.39ns 721.72M
1790 // shmtx_rd_pri_reads(32thread) 4845.97% 1.21ns 823.69M
1791 // shmtx_r_bare_reads(32thread) 4721.44% 1.25ns 802.52M
1792 // folly_ticket_reads(32thread) 28.40% 207.15ns 4.83M
1793 // boost_shared_reads(32thread) 17.08% 344.54ns 2.90M
1794 // pthrd_rwlock_reads(32thread) 30.01% 196.02ns 5.10M
1795 // ----------------------------------------------------------------------------
1796 // folly_rwspin_reads(64thread) 59.19ns 16.89M
1797 // shmtx_wr_pri_reads(64thread) 3804.54% 1.56ns 642.76M
1798 // shmtx_w_bare_reads(64thread) 3625.06% 1.63ns 612.43M
1799 // shmtx_rd_pri_reads(64thread) 3418.19% 1.73ns 577.48M
1800 // shmtx_r_bare_reads(64thread) 3416.98% 1.73ns 577.28M
1801 // folly_ticket_reads(64thread) 30.53% 193.90ns 5.16M
1802 // boost_shared_reads(64thread) 18.59% 318.47ns 3.14M
1803 // pthrd_rwlock_reads(64thread) 31.35% 188.81ns 5.30M
1804 // ----------------------------------------------------------------------------
1805 // ----------------------------------------------------------------------------
1806 // folly_rwspin(1thread_all_write) 23.77ns 42.06M
1807 // shmtx_wr_pri(1thread_all_write) 85.09% 27.94ns 35.79M
1808 // shmtx_rd_pri(1thread_all_write) 85.32% 27.87ns 35.89M
1809 // folly_ticket(1thread_all_write) 88.11% 26.98ns 37.06M
1810 // boost_shared(1thread_all_write) 16.49% 144.14ns 6.94M
1811 // pthrd_rwlock(1thread_all_write) 53.99% 44.04ns 22.71M
1812 // pthrd_mutex_(1thread_all_write) 86.05% 27.63ns 36.20M
1813 // ----------------------------------------------------------------------------
1814 // folly_rwspin(2thread_all_write) 76.05ns 13.15M
1815 // shmtx_wr_pri(2thread_all_write) 60.67% 125.35ns 7.98M
1816 // shmtx_rd_pri(2thread_all_write) 60.36% 125.99ns 7.94M
1817 // folly_ticket(2thread_all_write) 129.10% 58.91ns 16.98M
1818 // boost_shared(2thread_all_write) 18.65% 407.74ns 2.45M
1819 // pthrd_rwlock(2thread_all_write) 40.90% 185.92ns 5.38M
1820 // pthrd_mutex_(2thread_all_write) 127.37% 59.71ns 16.75M
1821 // ----------------------------------------------------------------------------
1822 // folly_rwspin(4thread_all_write) 207.17ns 4.83M
1823 // shmtx_wr_pri(4thread_all_write) 119.42% 173.49ns 5.76M
1824 // shmtx_rd_pri(4thread_all_write) 117.68% 176.05ns 5.68M
1825 // folly_ticket(4thread_all_write) 182.39% 113.59ns 8.80M
1826 // boost_shared(4thread_all_write) 11.98% 1.73us 578.46K
1827 // pthrd_rwlock(4thread_all_write) 27.50% 753.25ns 1.33M
1828 // pthrd_mutex_(4thread_all_write) 117.75% 175.95ns 5.68M
1829 // ----------------------------------------------------------------------------
1830 // folly_rwspin(8thread_all_write) 326.50ns 3.06M
1831 // shmtx_wr_pri(8thread_all_write) 125.47% 260.22ns 3.84M
1832 // shmtx_rd_pri(8thread_all_write) 124.73% 261.76ns 3.82M
1833 // folly_ticket(8thread_all_write) 253.39% 128.85ns 7.76M
1834 // boost_shared(8thread_all_write) 6.36% 5.13us 194.87K
1835 // pthrd_rwlock(8thread_all_write) 38.54% 847.09ns 1.18M
1836 // pthrd_mutex_(8thread_all_write) 166.31% 196.32ns 5.09M
1837 // ----------------------------------------------------------------------------
1838 // folly_rwspin(16thread_all_write) 729.89ns 1.37M
1839 // shmtx_wr_pri(16thread_all_write) 219.91% 331.91ns 3.01M
1840 // shmtx_rd_pri(16thread_all_write) 220.09% 331.62ns 3.02M
1841 // folly_ticket(16thread_all_write) 390.06% 187.12ns 5.34M
1842 // boost_shared(16thread_all_write) 10.27% 7.11us 140.72K
1843 // pthrd_rwlock(16thread_all_write) 113.90% 640.84ns 1.56M
1844 // pthrd_mutex_(16thread_all_write) 401.97% 181.58ns 5.51M
1845 // ----------------------------------------------------------------------------
1846 // folly_rwspin(32thread_all_write) 1.55us 645.01K
1847 // shmtx_wr_pri(32thread_all_write) 415.05% 373.54ns 2.68M
1848 // shmtx_rd_pri(32thread_all_write) 258.45% 599.88ns 1.67M
1849 // folly_ticket(32thread_all_write) 525.40% 295.09ns 3.39M
1850 // boost_shared(32thread_all_write) 20.84% 7.44us 134.45K
1851 // pthrd_rwlock(32thread_all_write) 254.16% 610.00ns 1.64M
1852 // pthrd_mutex_(32thread_all_write) 852.51% 181.86ns 5.50M
1853 // ----------------------------------------------------------------------------
1854 // folly_rwspin(64thread_all_write) 2.03us 492.00K
1855 // shmtx_wr_pri(64thread_all_write) 517.65% 392.64ns 2.55M
1856 // shmtx_rd_pri(64thread_all_write) 288.20% 705.24ns 1.42M
1857 // folly_ticket(64thread_all_write) 638.22% 318.47ns 3.14M
1858 // boost_shared(64thread_all_write) 27.56% 7.37us 135.61K
1859 // pthrd_rwlock(64thread_all_write) 326.75% 622.04ns 1.61M
1860 // pthrd_mutex_(64thread_all_write) 1231.57% 165.04ns 6.06M
1861 // ----------------------------------------------------------------------------
1862 // ----------------------------------------------------------------------------
1863 // folly_rwspin(1thread_10pct_write) 19.39ns 51.58M
1864 // shmtx_wr_pri(1thread_10pct_write) 93.87% 20.65ns 48.42M
1865 // shmtx_rd_pri(1thread_10pct_write) 93.60% 20.71ns 48.28M
1866 // folly_ticket(1thread_10pct_write) 73.75% 26.29ns 38.04M
1867 // boost_shared(1thread_10pct_write) 12.97% 149.53ns 6.69M
1868 // pthrd_rwlock(1thread_10pct_write) 44.15% 43.92ns 22.77M
1869 // ----------------------------------------------------------------------------
1870 // folly_rwspin(2thread_10pct_write) 227.88ns 4.39M
1871 // shmtx_wr_pri(2thread_10pct_write) 321.08% 70.98ns 14.09M
1872 // shmtx_rd_pri(2thread_10pct_write) 280.65% 81.20ns 12.32M
1873 // folly_ticket(2thread_10pct_write) 220.43% 103.38ns 9.67M
1874 // boost_shared(2thread_10pct_write) 58.78% 387.71ns 2.58M
1875 // pthrd_rwlock(2thread_10pct_write) 112.68% 202.23ns 4.94M
1876 // ----------------------------------------------------------------------------
1877 // folly_rwspin(4thread_10pct_write) 444.94ns 2.25M
1878 // shmtx_wr_pri(4thread_10pct_write) 470.35% 94.60ns 10.57M
1879 // shmtx_rd_pri(4thread_10pct_write) 349.08% 127.46ns 7.85M
1880 // folly_ticket(4thread_10pct_write) 305.64% 145.58ns 6.87M
1881 // boost_shared(4thread_10pct_write) 44.43% 1.00us 998.57K
1882 // pthrd_rwlock(4thread_10pct_write) 100.59% 442.31ns 2.26M
1883 // ----------------------------------------------------------------------------
1884 // folly_rwspin(8thread_10pct_write) 424.67ns 2.35M
1885 // shmtx_wr_pri(8thread_10pct_write) 337.53% 125.82ns 7.95M
1886 // shmtx_rd_pri(8thread_10pct_write) 232.32% 182.79ns 5.47M
1887 // folly_ticket(8thread_10pct_write) 206.59% 205.56ns 4.86M
1888 // boost_shared(8thread_10pct_write) 19.45% 2.18us 457.90K
1889 // pthrd_rwlock(8thread_10pct_write) 78.58% 540.42ns 1.85M
1890 // ----------------------------------------------------------------------------
1891 // folly_rwspin(16thread_10pct_write) 727.04ns 1.38M
1892 // shmtx_wr_pri(16thread_10pct_write) 400.60% 181.49ns 5.51M
1893 // shmtx_rd_pri(16thread_10pct_write) 312.94% 232.33ns 4.30M
1894 // folly_ticket(16thread_10pct_write) 283.67% 256.30ns 3.90M
1895 // boost_shared(16thread_10pct_write) 15.87% 4.58us 218.32K
1896 // pthrd_rwlock(16thread_10pct_write) 131.28% 553.82ns 1.81M
1897 // ----------------------------------------------------------------------------
1898 // folly_rwspin(32thread_10pct_write) 810.61ns 1.23M
1899 // shmtx_wr_pri(32thread_10pct_write) 429.61% 188.68ns 5.30M
1900 // shmtx_rd_pri(32thread_10pct_write) 321.13% 252.42ns 3.96M
1901 // folly_ticket(32thread_10pct_write) 247.65% 327.32ns 3.06M
1902 // boost_shared(32thread_10pct_write) 8.34% 9.71us 102.94K
1903 // pthrd_rwlock(32thread_10pct_write) 144.28% 561.85ns 1.78M
1904 // ----------------------------------------------------------------------------
1905 // folly_rwspin(64thread_10pct_write) 1.10us 912.30K
1906 // shmtx_wr_pri(64thread_10pct_write) 486.68% 225.22ns 4.44M
1907 // shmtx_rd_pri(64thread_10pct_write) 412.96% 265.43ns 3.77M
1908 // folly_ticket(64thread_10pct_write) 280.23% 391.15ns 2.56M
1909 // boost_shared(64thread_10pct_write) 6.16% 17.79us 56.22K
1910 // pthrd_rwlock(64thread_10pct_write) 198.81% 551.34ns 1.81M
1911 // ----------------------------------------------------------------------------
1912 // ----------------------------------------------------------------------------
1913 // folly_rwspin(1thread_1pct_write) 19.02ns 52.57M
1914 // shmtx_wr_pri(1thread_1pct_write) 94.46% 20.14ns 49.66M
1915 // shmtx_w_bare(1thread_1pct_write) 76.60% 24.83ns 40.27M
1916 // shmtx_rd_pri(1thread_1pct_write) 93.83% 20.27ns 49.33M
1917 // shmtx_r_bare(1thread_1pct_write) 77.04% 24.69ns 40.50M
1918 // folly_ticket(1thread_1pct_write) 72.83% 26.12ns 38.29M
1919 // boost_shared(1thread_1pct_write) 12.48% 152.44ns 6.56M
1920 // pthrd_rwlock(1thread_1pct_write) 42.85% 44.39ns 22.53M
1921 // ----------------------------------------------------------------------------
1922 // folly_rwspin(2thread_1pct_write) 110.63ns 9.04M
1923 // shmtx_wr_pri(2thread_1pct_write) 442.12% 25.02ns 39.96M
1924 // shmtx_w_bare(2thread_1pct_write) 374.65% 29.53ns 33.86M
1925 // shmtx_rd_pri(2thread_1pct_write) 371.08% 29.81ns 33.54M
1926 // shmtx_r_bare(2thread_1pct_write) 138.02% 80.15ns 12.48M
1927 // folly_ticket(2thread_1pct_write) 131.34% 84.23ns 11.87M
1928 // boost_shared(2thread_1pct_write) 30.35% 364.58ns 2.74M
1929 // pthrd_rwlock(2thread_1pct_write) 95.48% 115.87ns 8.63M
1930 // ----------------------------------------------------------------------------
1931 // folly_rwspin(4thread_1pct_write) 140.62ns 7.11M
1932 // shmtx_wr_pri(4thread_1pct_write) 627.13% 22.42ns 44.60M
1933 // shmtx_w_bare(4thread_1pct_write) 552.94% 25.43ns 39.32M
1934 // shmtx_rd_pri(4thread_1pct_write) 226.06% 62.21ns 16.08M
1935 // shmtx_r_bare(4thread_1pct_write) 77.61% 181.19ns 5.52M
1936 // folly_ticket(4thread_1pct_write) 119.58% 117.60ns 8.50M
1937 // boost_shared(4thread_1pct_write) 25.36% 554.54ns 1.80M
1938 // pthrd_rwlock(4thread_1pct_write) 45.55% 308.72ns 3.24M
1939 // ----------------------------------------------------------------------------
1940 // folly_rwspin(8thread_1pct_write) 166.23ns 6.02M
1941 // shmtx_wr_pri(8thread_1pct_write) 687.09% 24.19ns 41.33M
1942 // shmtx_w_bare(8thread_1pct_write) 611.80% 27.17ns 36.80M
1943 // shmtx_rd_pri(8thread_1pct_write) 140.37% 118.43ns 8.44M
1944 // shmtx_r_bare(8thread_1pct_write) 80.32% 206.97ns 4.83M
1945 // folly_ticket(8thread_1pct_write) 117.06% 142.01ns 7.04M
1946 // boost_shared(8thread_1pct_write) 22.29% 745.67ns 1.34M
1947 // pthrd_rwlock(8thread_1pct_write) 49.84% 333.55ns 3.00M
1948 // ----------------------------------------------------------------------------
1949 // folly_rwspin(16thread_1pct_write) 419.79ns 2.38M
1950 // shmtx_wr_pri(16thread_1pct_write) 1397.92% 30.03ns 33.30M
1951 // shmtx_w_bare(16thread_1pct_write) 1324.60% 31.69ns 31.55M
1952 // shmtx_rd_pri(16thread_1pct_write) 278.12% 150.94ns 6.63M
1953 // shmtx_r_bare(16thread_1pct_write) 194.25% 216.11ns 4.63M
1954 // folly_ticket(16thread_1pct_write) 255.38% 164.38ns 6.08M
1955 // boost_shared(16thread_1pct_write) 33.71% 1.25us 803.01K
1956 // pthrd_rwlock(16thread_1pct_write) 131.96% 318.12ns 3.14M
1957 // ----------------------------------------------------------------------------
1958 // folly_rwspin(32thread_1pct_write) 395.99ns 2.53M
1959 // shmtx_wr_pri(32thread_1pct_write) 1332.76% 29.71ns 33.66M
1960 // shmtx_w_bare(32thread_1pct_write) 1208.86% 32.76ns 30.53M
1961 // shmtx_rd_pri(32thread_1pct_write) 252.97% 156.54ns 6.39M
1962 // shmtx_r_bare(32thread_1pct_write) 193.79% 204.35ns 4.89M
1963 // folly_ticket(32thread_1pct_write) 173.16% 228.69ns 4.37M
1964 // boost_shared(32thread_1pct_write) 17.00% 2.33us 429.40K
1965 // pthrd_rwlock(32thread_1pct_write) 129.88% 304.89ns 3.28M
1966 // ----------------------------------------------------------------------------
1967 // folly_rwspin(64thread_1pct_write) 424.07ns 2.36M
1968 // shmtx_wr_pri(64thread_1pct_write) 1297.89% 32.67ns 30.61M
1969 // shmtx_w_bare(64thread_1pct_write) 1228.88% 34.51ns 28.98M
1970 // shmtx_rd_pri(64thread_1pct_write) 270.40% 156.83ns 6.38M
1971 // shmtx_r_bare(64thread_1pct_write) 218.05% 194.48ns 5.14M
1972 // folly_ticket(64thread_1pct_write) 171.44% 247.36ns 4.04M
1973 // boost_shared(64thread_1pct_write) 10.60% 4.00us 249.95K
1974 // pthrd_rwlock(64thread_1pct_write) 143.80% 294.91ns 3.39M
1975 // ----------------------------------------------------------------------------
1976 // folly_rwspin(2thr_2lock_50pct_write) 10.87ns 91.99M
1977 // shmtx_wr_pri(2thr_2lock_50pct_write) 83.71% 12.99ns 77.01M
1978 // shmtx_rd_pri(2thr_2lock_50pct_write) 84.08% 12.93ns 77.34M
1979 // folly_rwspin(4thr_4lock_50pct_write) 5.32ns 188.12M
1980 // shmtx_wr_pri(4thr_4lock_50pct_write) 82.21% 6.47ns 154.65M
1981 // shmtx_rd_pri(4thr_4lock_50pct_write) 81.20% 6.55ns 152.75M
1982 // folly_rwspin(8thr_8lock_50pct_write) 2.64ns 379.06M
1983 // shmtx_wr_pri(8thr_8lock_50pct_write) 81.26% 3.25ns 308.03M
1984 // shmtx_rd_pri(8thr_8lock_50pct_write) 80.95% 3.26ns 306.86M
1985 // folly_rwspin(16thr_16lock_50pct_write) 1.52ns 656.77M
1986 // shmtx_wr_pri(16thr_16lock_50pct_write) 86.24% 1.77ns 566.41M
1987 // shmtx_rd_pri(16thr_16lock_50pct_write) 83.72% 1.82ns 549.82M
1988 // folly_rwspin(32thr_32lock_50pct_write) 1.19ns 841.03M
1989 // shmtx_wr_pri(32thr_32lock_50pct_write) 85.08% 1.40ns 715.55M
1990 // shmtx_rd_pri(32thr_32lock_50pct_write) 86.44% 1.38ns 727.00M
1991 // folly_rwspin(64thr_64lock_50pct_write) 1.46ns 684.28M
1992 // shmtx_wr_pri(64thr_64lock_50pct_write) 84.53% 1.73ns 578.43M
1993 // shmtx_rd_pri(64thr_64lock_50pct_write) 82.80% 1.76ns 566.58M
1994 // ----------------------------------------------------------------------------
1995 // folly_rwspin(2thr_2lock_10pct_write) 10.01ns 99.85M
1996 // shmtx_wr_pri(2thr_2lock_10pct_write) 92.02% 10.88ns 91.88M
1997 // shmtx_rd_pri(2thr_2lock_10pct_write) 92.35% 10.84ns 92.22M
1998 // folly_rwspin(4thr_4lock_10pct_write) 4.81ns 207.87M
1999 // shmtx_wr_pri(4thr_4lock_10pct_write) 89.32% 5.39ns 185.67M
2000 // shmtx_rd_pri(4thr_4lock_10pct_write) 88.96% 5.41ns 184.93M
2001 // folly_rwspin(8thr_8lock_10pct_write) 2.39ns 417.62M
2002 // shmtx_wr_pri(8thr_8lock_10pct_write) 91.17% 2.63ns 380.76M
2003 // shmtx_rd_pri(8thr_8lock_10pct_write) 89.53% 2.67ns 373.92M
2004 // folly_rwspin(16thr_16lock_10pct_write) 1.16ns 860.47M
2005 // shmtx_wr_pri(16thr_16lock_10pct_write) 74.35% 1.56ns 639.77M
2006 // shmtx_rd_pri(16thr_16lock_10pct_write) 91.34% 1.27ns 785.97M
2007 // folly_rwspin(32thr_32lock_10pct_write) 1.15ns 866.23M
2008 // shmtx_wr_pri(32thr_32lock_10pct_write) 92.32% 1.25ns 799.72M
2009 // shmtx_rd_pri(32thr_32lock_10pct_write) 94.40% 1.22ns 817.71M
2010 // folly_rwspin(64thr_64lock_10pct_write) 1.41ns 710.54M
2011 // shmtx_wr_pri(64thr_64lock_10pct_write) 94.14% 1.50ns 668.88M
2012 // shmtx_rd_pri(64thr_64lock_10pct_write) 94.80% 1.48ns 673.56M
2013 // ----------------------------------------------------------------------------
2014 // folly_rwspin(2thr_2lock_1pct_write) 9.58ns 104.36M
2015 // shmtx_wr_pri(2thr_2lock_1pct_write) 92.00% 10.42ns 96.01M
2016 // shmtx_rd_pri(2thr_2lock_1pct_write) 91.79% 10.44ns 95.79M
2017 // folly_rwspin(4thr_4lock_1pct_write) 4.71ns 212.30M
2018 // shmtx_wr_pri(4thr_4lock_1pct_write) 90.37% 5.21ns 191.85M
2019 // shmtx_rd_pri(4thr_4lock_1pct_write) 89.94% 5.24ns 190.95M
2020 // folly_rwspin(8thr_8lock_1pct_write) 2.33ns 429.91M
2021 // shmtx_wr_pri(8thr_8lock_1pct_write) 90.67% 2.57ns 389.80M
2022 // shmtx_rd_pri(8thr_8lock_1pct_write) 90.61% 2.57ns 389.55M
2023 // folly_rwspin(16thr_16lock_1pct_write) 1.10ns 905.23M
2024 // shmtx_wr_pri(16thr_16lock_1pct_write) 91.96% 1.20ns 832.46M
2025 // shmtx_rd_pri(16thr_16lock_1pct_write) 92.29% 1.20ns 835.42M
2026 // folly_rwspin(32thr_32lock_1pct_write) 1.14ns 879.85M
2027 // shmtx_wr_pri(32thr_32lock_1pct_write) 93.41% 1.22ns 821.86M
2028 // shmtx_rd_pri(32thr_32lock_1pct_write) 94.18% 1.21ns 828.66M
2029 // folly_rwspin(64thr_64lock_1pct_write) 1.34ns 748.83M
2030 // shmtx_wr_pri(64thr_64lock_1pct_write) 94.39% 1.41ns 706.84M
2031 // shmtx_rd_pri(64thr_64lock_1pct_write) 94.02% 1.42ns 704.06M
2032 // ----------------------------------------------------------------------------
2033 // ----------------------------------------------------------------------------
2034 // folly_rwspin_ping_pong(burn0) 605.63ns 1.65M
2035 // shmtx_w_bare_ping_pong(burn0) 102.17% 592.76ns 1.69M
2036 // shmtx_r_bare_ping_pong(burn0) 88.75% 682.44ns 1.47M
2037 // folly_ticket_ping_pong(burn0) 63.92% 947.56ns 1.06M
2038 // boost_shared_ping_pong(burn0) 8.52% 7.11us 140.73K
2039 // pthrd_rwlock_ping_pong(burn0) 7.88% 7.68us 130.15K
2040 // ----------------------------------------------------------------------------
2041 // folly_rwspin_ping_pong(burn100k) 727.76ns 1.37M
2042 // shmtx_w_bare_ping_pong(burn100k) 100.79% 722.09ns 1.38M
2043 // shmtx_r_bare_ping_pong(burn100k) 101.98% 713.61ns 1.40M
2044 // folly_ticket_ping_pong(burn100k) 102.80% 707.95ns 1.41M
2045 // boost_shared_ping_pong(burn100k) 81.49% 893.02ns 1.12M
2046 // pthrd_rwlock_ping_pong(burn100k) 71.05% 1.02us 976.30K
2047 // ----------------------------------------------------------------------------
2048 // folly_rwspin_ping_pong(burn300k) 2.11us 473.46K
2049 // shmtx_w_bare_ping_pong(burn300k) 100.06% 2.11us 473.72K
2050 // shmtx_r_bare_ping_pong(burn300k) 98.93% 2.13us 468.39K
2051 // folly_ticket_ping_pong(burn300k) 96.68% 2.18us 457.73K
2052 // boost_shared_ping_pong(burn300k) 84.72% 2.49us 401.13K
2053 // pthrd_rwlock_ping_pong(burn300k) 84.62% 2.50us 400.66K
2054 // ----------------------------------------------------------------------------
2055 // folly_rwspin_ping_pong(burn1M) 709.70ns 1.41M
2056 // shmtx_w_bare_ping_pong(burn1M) 100.28% 707.73ns 1.41M
2057 // shmtx_r_bare_ping_pong(burn1M) 99.63% 712.37ns 1.40M
2058 // folly_ticket_ping_pong(burn1M) 100.09% 709.05ns 1.41M
2059 // boost_shared_ping_pong(burn1M) 94.09% 754.29ns 1.33M
2060 // pthrd_rwlock_ping_pong(burn1M) 96.32% 736.82ns 1.36M
2061 // ============================================================================
2063 int main(int argc, char** argv) {
2064 (void)folly_rwspin_reads;
2065 (void)shmtx_wr_pri_reads;
2066 (void)shmtx_w_bare_reads;
2067 (void)shmtx_rd_pri_reads;
2068 (void)shmtx_r_bare_reads;
2069 (void)folly_ticket_reads;
2070 (void)boost_shared_reads;
2071 (void)pthrd_rwlock_reads;
2081 (void)folly_rwspin_ping_pong;
2082 (void)shmtx_w_bare_ping_pong;
2083 (void)shmtx_r_bare_ping_pong;
2084 (void)folly_ticket_ping_pong;
2085 (void)boost_shared_ping_pong;
2086 (void)pthrd_rwlock_ping_pong;
2088 testing::InitGoogleTest(&argc, argv);
2089 gflags::ParseCommandLineFlags(&argc, &argv, true);
2090 int rv = RUN_ALL_TESTS();
2091 folly::runBenchmarksOnFlag();