76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
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// Copyright 2017 Google Inc. All Rights Reserved.
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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/random/internal/nanobenchmark.h"
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#include "absl/base/internal/raw_logging.h"
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#include "absl/strings/numbers.h"
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namespace absl {
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namespace random_internal_nanobenchmark {
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namespace {
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uint64_t Div(const void*, FuncInput in) {
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// Here we're measuring the throughput because benchmark invocations are
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// independent.
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const int64_t d1 = 0xFFFFFFFFFFll / int64_t(in); // IDIV
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return d1;
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}
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template <size_t N>
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void MeasureDiv(const FuncInput (&inputs)[N]) {
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Result results[N];
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Params params;
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params.max_evals = 6; // avoid test timeout
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const size_t num_results = Measure(&Div, nullptr, inputs, N, results, params);
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if (num_results == 0) {
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ABSL_RAW_LOG(
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WARNING,
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"WARNING: Measurement failed, should not happen when using "
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"PinThreadToCPU unless the region to measure takes > 1 second.\n");
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return;
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}
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for (size_t i = 0; i < num_results; ++i) {
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ABSL_RAW_LOG(INFO, "%5zu: %6.2f ticks; MAD=%4.2f%%\n", results[i].input,
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results[i].ticks, results[i].variability * 100.0);
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ABSL_RAW_CHECK(results[i].ticks != 0.0f, "Zero duration");
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}
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}
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void RunAll(const int argc, char* argv[]) {
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// Avoid migrating between cores - important on multi-socket systems.
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int cpu = -1;
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if (argc == 2) {
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if (!SimpleAtoi(argv[1], &cpu)) {
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ABSL_RAW_LOG(FATAL, "The optional argument must be a CPU number >= 0.\n");
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}
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}
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PinThreadToCPU(cpu);
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// unpredictable == 1 but the compiler doesn't know that.
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const FuncInput unpredictable = argc != 999;
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static const FuncInput inputs[] = {unpredictable * 10, unpredictable * 100};
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MeasureDiv(inputs);
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}
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} // namespace
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} // namespace random_internal_nanobenchmark
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} // namespace absl
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int main(int argc, char* argv[]) {
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absl::random_internal_nanobenchmark::RunAll(argc, argv);
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return 0;
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}
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