spinlock_benchmark.cc

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// Copyright 2018 The Abseil Authors.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//      https://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

// See also //absl/synchronization:mutex_benchmark for a comparison of SpinLock

// and Mutex performance under varying levels of contention.

#include "absl/base/internal/raw_logging.h"

#include "absl/base/internal/scheduling_mode.h"

#include "absl/base/internal/spinlock.h"

#include "absl/synchronization/internal/create_thread_identity.h"

#include "benchmark/benchmark.h"

namespace {

template <absl::base_internal::SchedulingMode scheduling_mode>

static void BM_SpinLock(benchmark::State& state) {

  // Ensure a ThreadIdentity is installed.

  ABSL_INTERNAL_CHECK(

      absl::synchronization_internal::GetOrCreateCurrentThreadIdentity() !=

          nullptr,

      "GetOrCreateCurrentThreadIdentity() failed");

  static auto* spinlock = new absl::base_internal::SpinLock(scheduling_mode);

  for (auto _ : state) {

    absl::base_internal::SpinLockHolder holder(spinlock);

BENCHMARK_TEMPLATE(BM_SpinLock,

                   absl::base_internal::SCHEDULE_KERNEL_ONLY)

    ->UseRealTime()

    ->Threads(1)

    ->ThreadPerCpu();

BENCHMARK_TEMPLATE(BM_SpinLock,

                   absl::base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL)

    ->UseRealTime()

    ->Threads(1)

    ->ThreadPerCpu();

}  // namespace