Abseil Common Libraries (C++) (grcp 依赖)
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52 lines
1.8 KiB
52 lines
1.8 KiB
// 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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// http://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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