Abseil Common Libraries (C++) (grcp 依赖)
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56 lines
1.7 KiB
56 lines
1.7 KiB
3 years ago
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// Copyright 2022 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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#include "absl/base/attributes.h"
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#include "absl/base/config.h"
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#include "absl/base/optimization.h"
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#include "absl/debugging/stacktrace.h"
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#include "benchmark/benchmark.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace {
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static constexpr int kMaxStackDepth = 100;
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static constexpr int kCacheSize = (1 << 16);
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void* pcs[kMaxStackDepth];
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ABSL_ATTRIBUTE_NOINLINE void func(benchmark::State& state, int x, int depth) {
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if (x <= 0) {
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// Touch a significant amount of memory so that the stack is likely to be
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// not cached in the L1 cache.
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state.PauseTiming();
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int* arr = new int[kCacheSize];
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for (int i = 0; i < kCacheSize; ++i) benchmark::DoNotOptimize(arr[i] = 100);
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delete[] arr;
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state.ResumeTiming();
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benchmark::DoNotOptimize(absl::GetStackTrace(pcs, depth, 0));
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return;
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}
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ABSL_BLOCK_TAIL_CALL_OPTIMIZATION();
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func(state, --x, depth);
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}
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void BM_GetStackTrace(benchmark::State& state) {
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int depth = state.range(0);
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for (auto s : state) {
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func(state, depth, depth);
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}
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}
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BENCHMARK(BM_GetStackTrace)->DenseRange(10, kMaxStackDepth, 10);
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} // namespace
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ABSL_NAMESPACE_END
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} // namespace absl
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