fc8dc48020
git-subtree-dir: third_party/abseil_cpp git-subtree-mainline:ffb2ae54begit-subtree-split:768eb2ca28
52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
// Copyright 2018 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// See also //absl/synchronization:mutex_benchmark for a comparison of SpinLock
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// and Mutex performance under varying levels of contention.
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#include "absl/base/internal/raw_logging.h"
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#include "absl/base/internal/scheduling_mode.h"
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#include "absl/base/internal/spinlock.h"
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#include "absl/synchronization/internal/create_thread_identity.h"
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#include "benchmark/benchmark.h"
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namespace {
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template <absl::base_internal::SchedulingMode scheduling_mode>
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static void BM_SpinLock(benchmark::State& state) {
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// Ensure a ThreadIdentity is installed.
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ABSL_INTERNAL_CHECK(
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absl::synchronization_internal::GetOrCreateCurrentThreadIdentity() !=
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nullptr,
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"GetOrCreateCurrentThreadIdentity() failed");
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static auto* spinlock = new absl::base_internal::SpinLock(scheduling_mode);
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for (auto _ : state) {
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absl::base_internal::SpinLockHolder holder(spinlock);
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}
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}
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BENCHMARK_TEMPLATE(BM_SpinLock,
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absl::base_internal::SCHEDULE_KERNEL_ONLY)
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->UseRealTime()
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->Threads(1)
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->ThreadPerCpu();
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BENCHMARK_TEMPLATE(BM_SpinLock,
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absl::base_internal::SCHEDULE_COOPERATIVE_AND_KERNEL)
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->UseRealTime()
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->Threads(1)
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->ThreadPerCpu();
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} // namespace
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