ceres-solver/internal/ceres/event_logger.cc

// Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2024 Google Inc. All rights reserved.
// http://ceres-solver.org/
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// Author: strandmark@google.com (Petter Strandmark)

#include "ceres/event_logger.h"

#include <string>
#include <string_view>

#include "absl/log/log.h"
#include "absl/log/vlog_is_on.h"
#include "absl/strings/str_format.h"
#include "absl/time/clock.h"
#include "absl/time/time.h"

namespace ceres::internal {

EventLogger::EventLogger(std::string_view logger_name)
    : start_time_(absl::Now()) {
  if (!VLOG_IS_ON(3)) {
    return;
  }

  last_event_time_ = start_time_;
  events_ = absl::StrFormat(
      "\n%s\n                                        Delta   Cumulative\n",
      logger_name);
}

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

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

  const absl::Time now = absl::Now();
  absl::StrAppendFormat(&events_,
                        "  %30s : %10.5f   %10.5f\n",
                        event_name,
                        absl::ToDoubleSeconds(now - last_event_time_),
                        absl::ToDoubleSeconds(now - start_time_));
  last_event_time_ = now;
}

}  // namespace ceres::internal