diff options
Diffstat (limited to 'third_party/abseil_cpp/absl/random/internal/randen_benchmarks.cc')
-rw-r--r-- | third_party/abseil_cpp/absl/random/internal/randen_benchmarks.cc | 174 |
1 files changed, 0 insertions, 174 deletions
diff --git a/third_party/abseil_cpp/absl/random/internal/randen_benchmarks.cc b/third_party/abseil_cpp/absl/random/internal/randen_benchmarks.cc deleted file mode 100644 index f589172c0466..000000000000 --- a/third_party/abseil_cpp/absl/random/internal/randen_benchmarks.cc +++ /dev/null @@ -1,174 +0,0 @@ -// Copyright 2017 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. -// -#include "absl/random/internal/randen.h" - -#include <cstdint> -#include <cstdio> -#include <cstring> - -#include "absl/base/internal/raw_logging.h" -#include "absl/random/internal/nanobenchmark.h" -#include "absl/random/internal/platform.h" -#include "absl/random/internal/randen_engine.h" -#include "absl/random/internal/randen_hwaes.h" -#include "absl/random/internal/randen_slow.h" -#include "absl/strings/numbers.h" - -namespace { - -using absl::random_internal::Randen; -using absl::random_internal::RandenHwAes; -using absl::random_internal::RandenSlow; - -using absl::random_internal_nanobenchmark::FuncInput; -using absl::random_internal_nanobenchmark::FuncOutput; -using absl::random_internal_nanobenchmark::InvariantTicksPerSecond; -using absl::random_internal_nanobenchmark::MeasureClosure; -using absl::random_internal_nanobenchmark::Params; -using absl::random_internal_nanobenchmark::PinThreadToCPU; -using absl::random_internal_nanobenchmark::Result; - -// Local state parameters. -static constexpr size_t kStateSizeT = Randen::kStateBytes / sizeof(uint64_t); -static constexpr size_t kSeedSizeT = Randen::kSeedBytes / sizeof(uint32_t); - -// Randen implementation benchmarks. -template <typename T> -struct AbsorbFn : public T { - mutable uint64_t state[kStateSizeT] = {}; - mutable uint32_t seed[kSeedSizeT] = {}; - - static constexpr size_t bytes() { return sizeof(seed); } - - FuncOutput operator()(const FuncInput num_iters) const { - for (size_t i = 0; i < num_iters; ++i) { - this->Absorb(seed, state); - } - return state[0]; - } -}; - -template <typename T> -struct GenerateFn : public T { - mutable uint64_t state[kStateSizeT]; - GenerateFn() { std::memset(state, 0, sizeof(state)); } - - static constexpr size_t bytes() { return sizeof(state); } - - FuncOutput operator()(const FuncInput num_iters) const { - const auto* keys = this->GetKeys(); - for (size_t i = 0; i < num_iters; ++i) { - this->Generate(keys, state); - } - return state[0]; - } -}; - -template <typename UInt> -struct Engine { - mutable absl::random_internal::randen_engine<UInt> rng; - - static constexpr size_t bytes() { return sizeof(UInt); } - - FuncOutput operator()(const FuncInput num_iters) const { - for (size_t i = 0; i < num_iters - 1; ++i) { - rng(); - } - return rng(); - } -}; - -template <size_t N> -void Print(const char* name, const size_t n, const Result (&results)[N], - const size_t bytes) { - if (n == 0) { - ABSL_RAW_LOG( - WARNING, - "WARNING: Measurement failed, should not happen when using " - "PinThreadToCPU unless the region to measure takes > 1 second.\n"); - return; - } - - static const double ns_per_tick = 1e9 / InvariantTicksPerSecond(); - static constexpr const double kNsPerS = 1e9; // ns/s - static constexpr const double kMBPerByte = 1.0 / 1048576.0; // Mb / b - static auto header = [] { - return printf("%20s %8s: %12s ticks; %9s (%9s) %8s\n", "Name", "Count", - "Total", "Variance", "Time", "bytes/s"); - }(); - (void)header; - - for (size_t i = 0; i < n; ++i) { - const double ticks_per_call = results[i].ticks / results[i].input; - const double ns_per_call = ns_per_tick * ticks_per_call; - const double bytes_per_ns = bytes / ns_per_call; - const double mb_per_s = bytes_per_ns * kNsPerS * kMBPerByte; - // Output - printf("%20s %8zu: %12.2f ticks; MAD=%4.2f%% (%6.1f ns) %8.1f Mb/s\n", - name, results[i].input, results[i].ticks, - results[i].variability * 100.0, ns_per_call, mb_per_s); - } -} - -// Fails here -template <typename Op, size_t N> -void Measure(const char* name, const FuncInput (&inputs)[N]) { - Op op; - - Result results[N]; - Params params; - params.verbose = false; - params.max_evals = 6; // avoid test timeout - const size_t num_results = MeasureClosure(op, inputs, N, results, params); - Print(name, num_results, results, op.bytes()); -} - -// unpredictable == 1 but the compiler does not know that. -void RunAll(const int argc, char* argv[]) { - if (argc == 2) { - int cpu = -1; - if (!absl::SimpleAtoi(argv[1], &cpu)) { - ABSL_RAW_LOG(FATAL, "The optional argument must be a CPU number >= 0.\n"); - } - PinThreadToCPU(cpu); - } - - // The compiler cannot reduce this to a constant. - const FuncInput unpredictable = (argc != 999); - static const FuncInput inputs[] = {unpredictable * 100, unpredictable * 1000}; - -#if !defined(ABSL_INTERNAL_DISABLE_AES) && ABSL_HAVE_ACCELERATED_AES - Measure<AbsorbFn<RandenHwAes>>("Absorb (HwAes)", inputs); -#endif - Measure<AbsorbFn<RandenSlow>>("Absorb (Slow)", inputs); - -#if !defined(ABSL_INTERNAL_DISABLE_AES) && ABSL_HAVE_ACCELERATED_AES - Measure<GenerateFn<RandenHwAes>>("Generate (HwAes)", inputs); -#endif - Measure<GenerateFn<RandenSlow>>("Generate (Slow)", inputs); - - // Measure the production engine. - static const FuncInput inputs1[] = {unpredictable * 1000, - unpredictable * 10000}; - Measure<Engine<uint64_t>>("randen_engine<uint64_t>", inputs1); - Measure<Engine<uint32_t>>("randen_engine<uint32_t>", inputs1); -} - -} // namespace - -int main(int argc, char* argv[]) { - RunAll(argc, argv); - return 0; -} |