From fcb104594b0bb4b8ac306cb2f55ecdad40974683 Mon Sep 17 00:00:00 2001 From: Abseil Team Date: Tue, 4 Dec 2018 11:01:12 -0800 Subject: Creation of LTS branch "lts_2018_12_18" - 44b0fafc62d9b8f192e8180cbe9c4b806b339d57 Export of internal Abseil changes. by Abseil Team - 926bfeb9fff223429c12224b7514243886323e8d Export of internal Abseil changes. by Abseil Team - 13327debebc5c2d1d4991b69fe50450e340e50e4 Export of internal Abseil changes. by Abseil Team - 3088e76c597e068479e82508b1770a7ad0c806b6 Export of internal Abseil changes. by Abseil Team - f6ae816808cd913e0e2b3e2af14f328fa1071af0 Export of internal Abseil changes. by Abseil Team - a06c4a1d9093137b7217a5aaba8920d62e835dc0 Export of internal Abseil changes. by Abseil Team - 7b46e1d31a6b08b1c6da2a13e7b151a20446fa07 Export of internal Abseil changes. by Abseil Team - 070f6e47b33a2909d039e620c873204f78809492 Export of internal Abseil changes. by Abseil Team - 7990fd459e9339467814ddb95000c87cb1e4d945 Export of internal Abseil changes. by Abseil Team - 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92e07e5590752d6b8e67f7f2f86c6286561e8cea Merge pull request #152 from clnperez/fix-multi-defines-p... by Derek Mauro <761129+derekmauro@users.noreply.github.com> - 2125e6444a9de9e41f21ecdc674dd7d8759c149d Export of internal Abseil changes. by Abseil Team - 9acad869d21731f5bc50430a33fe61cc0ffcbb0b Merge pull request #150 from OlafvdSpek/patch-2 by Jonathan Cohen - c2e00d341913bf03b4597ade5b056042e23e8c58 Export of internal Abseil changes. by Abseil Team - 9e060686d1c325f34f9806b45fe77bafeed00aee Export of internal Abseil changes. by Abseil Team - 7aa411ceafc1272a28579cca739a97a2fb79055a Export of internal Abseil changes. by Abseil Team - 2c5af55ed34850d8b7dd46177c8ca53fdfda920e Export of internal Abseil changes. by Abseil Team - 44aa275286baf97fc13529aca547a88b180beb08 Merge pull request #143 from rongjiecomputer/kernel by Xiaoyi Zhang - 42f22a28401c952f1fc5942231c7fdac80811bf5 Export of internal Abseil changes. by Abseil Team - b973bc53ef366f0253b85eeed9a79b241884a843 Merge pull request #139 from siepkes/smartos-support by ahedberg - 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87a4c07856e7dc69958019d47b2f02ae47746ec0 Export of internal Abseil changes. by Abseil Team - 4491d606df34c44efda47b6d17b605262f17e182 Export of internal Abseil changes. by Abseil Team GitOrigin-RevId: 44b0fafc62d9b8f192e8180cbe9c4b806b339d57 Change-Id: I2c427b5b41b2d34101922048b00f3d9dafcb498d --- absl/synchronization/mutex_benchmark.cc | 159 +++++++++++++++++++++++++++++--- 1 file changed, 144 insertions(+), 15 deletions(-) (limited to 'absl/synchronization/mutex_benchmark.cc') diff --git a/absl/synchronization/mutex_benchmark.cc b/absl/synchronization/mutex_benchmark.cc index 30a52355..2652bb97 100644 --- a/absl/synchronization/mutex_benchmark.cc +++ b/absl/synchronization/mutex_benchmark.cc @@ -12,16 +12,154 @@ // See the License for the specific language governing permissions and // limitations under the License. +#include +#include // NOLINT(build/c++11) #include -#include "benchmark/benchmark.h" -#include "absl/base/internal/sysinfo.h" +#include "absl/base/internal/cycleclock.h" +#include "absl/base/internal/spinlock.h" #include "absl/synchronization/blocking_counter.h" #include "absl/synchronization/internal/thread_pool.h" #include "absl/synchronization/mutex.h" +#include "benchmark/benchmark.h" namespace { +void BM_Mutex(benchmark::State& state) { + static absl::Mutex* mu = new absl::Mutex; + for (auto _ : state) { + absl::MutexLock lock(mu); + } +} +BENCHMARK(BM_Mutex)->UseRealTime()->Threads(1)->ThreadPerCpu(); + +static void DelayNs(int64_t ns, int* data) { + int64_t end = absl::base_internal::CycleClock::Now() + + ns * absl::base_internal::CycleClock::Frequency() / 1e9; + while (absl::base_internal::CycleClock::Now() < end) { + ++(*data); + benchmark::DoNotOptimize(*data); + } +} + +template +class RaiiLocker { + public: + explicit RaiiLocker(MutexType* mu) : mu_(mu) { mu_->Lock(); } + ~RaiiLocker() { mu_->Unlock(); } + private: + MutexType* mu_; +}; + +template <> +class RaiiLocker { + public: + explicit RaiiLocker(std::mutex* mu) : mu_(mu) { mu_->lock(); } + ~RaiiLocker() { mu_->unlock(); } + private: + std::mutex* mu_; +}; + +template +void BM_Contended(benchmark::State& state) { + struct Shared { + MutexType mu; + int data = 0; + }; + static auto* shared = new Shared; + int local = 0; + for (auto _ : state) { + // Here we model both local work outside of the critical section as well as + // some work inside of the critical section. The idea is to capture some + // more or less realisitic contention levels. + // If contention is too low, the benchmark won't measure anything useful. + // If contention is unrealistically high, the benchmark will favor + // bad mutex implementations that block and otherwise distract threads + // from the mutex and shared state for as much as possible. + // To achieve this amount of local work is multiplied by number of threads + // to keep ratio between local work and critical section approximately + // equal regardless of number of threads. + DelayNs(100 * state.threads, &local); + RaiiLocker locker(&shared->mu); + DelayNs(state.range(0), &shared->data); + } +} + +BENCHMARK_TEMPLATE(BM_Contended, absl::Mutex) + ->UseRealTime() + // ThreadPerCpu poorly handles non-power-of-two CPU counts. + ->Threads(1) + ->Threads(2) + ->Threads(4) + ->Threads(6) + ->Threads(8) + ->Threads(12) + ->Threads(16) + ->Threads(24) + ->Threads(32) + ->Threads(48) + ->Threads(64) + ->Threads(96) + ->Threads(128) + ->Threads(192) + ->Threads(256) + // Some empirically chosen amounts of work in critical section. + // 1 is low contention, 200 is high contention and few values in between. + ->Arg(1) + ->Arg(20) + ->Arg(50) + ->Arg(200); + +BENCHMARK_TEMPLATE(BM_Contended, absl::base_internal::SpinLock) + ->UseRealTime() + // ThreadPerCpu poorly handles non-power-of-two CPU counts. + ->Threads(1) + ->Threads(2) + ->Threads(4) + ->Threads(6) + ->Threads(8) + ->Threads(12) + ->Threads(16) + ->Threads(24) + ->Threads(32) + ->Threads(48) + ->Threads(64) + ->Threads(96) + ->Threads(128) + ->Threads(192) + ->Threads(256) + // Some empirically chosen amounts of work in critical section. + // 1 is low contention, 200 is high contention and few values in between. + ->Arg(1) + ->Arg(20) + ->Arg(50) + ->Arg(200); + +BENCHMARK_TEMPLATE(BM_Contended, std::mutex) + ->UseRealTime() + // ThreadPerCpu poorly handles non-power-of-two CPU counts. + ->Threads(1) + ->Threads(2) + ->Threads(4) + ->Threads(6) + ->Threads(8) + ->Threads(12) + ->Threads(16) + ->Threads(24) + ->Threads(32) + ->Threads(48) + ->Threads(64) + ->Threads(96) + ->Threads(128) + ->Threads(192) + ->Threads(256) + // Some empirically chosen amounts of work in critical section. + // 1 is low contention, 200 is high contention and few values in between. + ->Arg(1) + ->Arg(20) + ->Arg(50) + ->Arg(200); + // Measure the overhead of conditions on mutex release (when they must be // evaluated). Mutex has (some) support for equivalence classes allowing // Conditions with the same function/argument to potentially not be multiply @@ -74,21 +212,12 @@ void BM_ConditionWaiters(benchmark::State& state) { mu.Unlock(); } -#ifdef THREAD_SANITIZER -// ThreadSanitizer can't handle 8192 threads. -constexpr int kMaxConditionWaiters = 2048; -#else +// Some configurations have higher thread limits than others. +#if defined(__linux__) && !defined(THREAD_SANITIZER) constexpr int kMaxConditionWaiters = 8192; +#else +constexpr int kMaxConditionWaiters = 1024; #endif BENCHMARK(BM_ConditionWaiters)->RangePair(0, 2, 1, kMaxConditionWaiters); -void BM_ContendedMutex(benchmark::State& state) { - static absl::Mutex* mu = new absl::Mutex; - for (auto _ : state) { - absl::MutexLock lock(mu); - } -} -BENCHMARK(BM_ContendedMutex)->Threads(1); -BENCHMARK(BM_ContendedMutex)->ThreadPerCpu(); - } // namespace -- cgit v1.2.3