protobuf/third_party/benchmark/src/reporter.cc

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// Copyright 2015 Google Inc. All rights reserved.
//
// 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
//
//     http://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 "benchmark/benchmark.h"
#include "timers.h"
 
#include <cstdlib>
 
#include <iostream>
#include <tuple>
#include <vector>
 
#include "check.h"
#include "stat.h"
 
namespace benchmark {
 
BenchmarkReporter::BenchmarkReporter()
    : output_stream_(&std::cout), error_stream_(&std::cerr) {}
 
BenchmarkReporter::~BenchmarkReporter() {}
 
void BenchmarkReporter::PrintBasicContext(std::ostream *out,
                                          Context const &context) {
  CHECK(out) << "cannot be null";
  auto &Out = *out;
 
  Out << "Run on (" << context.num_cpus << " X " << context.mhz_per_cpu
      << " MHz CPU " << ((context.num_cpus > 1) ? "s" : "") << ")\n";
 
  Out << LocalDateTimeString() << "\n";
 
  if (context.cpu_scaling_enabled) {
    Out << "***WARNING*** CPU scaling is enabled, the benchmark "
           "real time measurements may be noisy and will incur extra "
           "overhead.\n";
  }
 
#ifndef NDEBUG
  Out << "***WARNING*** Library was built as DEBUG. Timings may be "
         "affected.\n";
#endif
}
 
double BenchmarkReporter::Run::GetAdjustedRealTime() const {
  double new_time = real_accumulated_time * GetTimeUnitMultiplier(time_unit);
  if (iterations != 0) new_time /= static_cast<double>(iterations);
  return new_time;
}
 
double BenchmarkReporter::Run::GetAdjustedCPUTime() const {
  double new_time = cpu_accumulated_time * GetTimeUnitMultiplier(time_unit);
  if (iterations != 0) new_time /= static_cast<double>(iterations);
  return new_time;
}
 
}  // end namespace benchmark