12bc53e031
-- c99f979ad34f155fbeeea69b88bdc7458d89a21c by Derek Mauro <dmauro@google.com>: Remove a floating point division by zero test. This isn't testing behavior related to the library, and MSVC warns about it in opt mode. PiperOrigin-RevId: 285220804 -- 68b015491f0dbf1ab547994673281abd1f34cd4b by Gennadiy Rozental <rogeeff@google.com>: This CL introduces following changes to the class FlagImpl: * We eliminate the CommandLineFlagLocks struct. Instead callback guard and callback function are combined into a single CallbackData struct, while primary data lock is stored separately. * CallbackData member of class FlagImpl is initially set to be nullptr and is only allocated and initialized when a flag's callback is being set. For most flags we do not pay for the extra space and extra absl::Mutex now. * Primary data guard is stored in data_guard_ data member. This is a properly aligned character buffer of necessary size. During initialization of the flag we construct absl::Mutex in this space using placement new call. * We now avoid extra value copy after successful attempt to parse value out of string. Instead we swap flag's current value with tentative value we just produced. PiperOrigin-RevId: 285132636 -- ed45d118fb818969eb13094cf7827c885dfc562c by Tom Manshreck <shreck@google.com>: Change null-term* (and nul-term*) to NUL-term* in comments PiperOrigin-RevId: 285036610 -- 729619017944db895ce8d6d29c1995aa2e5628a5 by Derek Mauro <dmauro@google.com>: Use the Posix implementation of thread identity on MinGW. Some versions of MinGW suffer from thread_local bugs. PiperOrigin-RevId: 285022920 -- 39a25493503c76885bc3254c28f66a251c5b5bb0 by Greg Falcon <gfalcon@google.com>: Implementation detail change. Add further ABSL_NAMESPACE_BEGIN and _END annotation macros to files in Abseil. PiperOrigin-RevId: 285012012 GitOrigin-RevId: c99f979ad34f155fbeeea69b88bdc7458d89a21c Change-Id: I4c85d3704e45d11a9ac50d562f39640a6adbedc1
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
// 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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ABSL_NAMESPACE_BEGIN
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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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ABSL_NAMESPACE_END
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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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