ceres-solver/internal/ceres/wall_time.cc

// Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2023 Google Inc. All rights reserved.
// http://ceres-solver.org/
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//
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//   this list of conditions and the following disclaimer.
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// Author: strandmark@google.com (Petter Strandmark)

#include "ceres/wall_time.h"

#include <ctime>

#include "absl/log/log.h"
#include "ceres/internal/config.h"

#ifdef _WIN32
#include <windows.h>
#else
#include <sys/time.h>
#endif

#include "ceres/stringprintf.h"

namespace ceres::internal {

double WallTimeInSeconds() {
#ifdef _WIN32
  LARGE_INTEGER count;
  LARGE_INTEGER frequency;
  QueryPerformanceCounter(&count);
  QueryPerformanceFrequency(&frequency);
  return static_cast<double>(count.QuadPart) /
         static_cast<double>(frequency.QuadPart);
#else
  timeval time_val;
  gettimeofday(&time_val, nullptr);
  return (time_val.tv_sec + time_val.tv_usec * 1e-6);
#endif
}

EventLogger::EventLogger(const std::string& logger_name) {
  if (!VLOG_IS_ON(3)) {
    return;
  }

  start_time_ = WallTimeInSeconds();
  last_event_time_ = start_time_;
  events_ = StringPrintf(
      "\n%s\n                                        Delta   Cumulative\n",
      logger_name.c_str());
}

EventLogger::~EventLogger() {
  if (!VLOG_IS_ON(3)) {
    return;
  }
  AddEvent("Total");
  VLOG(3) << "\n" << events_ << "\n";
}

void EventLogger::AddEvent(const std::string& event_name) {
  if (!VLOG_IS_ON(3)) {
    return;
  }

  const double current_time = WallTimeInSeconds();
  const double relative_time_delta = current_time - last_event_time_;
  const double absolute_time_delta = current_time - start_time_;
  last_event_time_ = current_time;

  StringAppendF(&events_,
                "  %30s : %10.5f   %10.5f\n",
                event_name.c_str(),
                relative_time_delta,
                absolute_time_delta);
}

}  // namespace ceres::internal