profiler.hpp

// Copyright (c) Sleipnir contributors
 
#pragma once
 
#include <chrono>
#include <concepts>
#include <string>
#include <string_view>
#include <utility>
 
namespace slp {
 
class SetupProfiler {
 public:
  explicit SetupProfiler(std::string_view name) : m_name{name} {}
 
  void start() {
#ifndef SLEIPNIR_DISABLE_DIAGNOSTICS
    m_setup_start_time = std::chrono::steady_clock::now();
#endif
  }
 
  void stop() {
#ifndef SLEIPNIR_DISABLE_DIAGNOSTICS
    m_setup_stop_time = std::chrono::steady_clock::now();
    m_setup_duration = m_setup_stop_time - m_setup_start_time;
#endif
  }
 
  std::string_view name() const { return m_name; }
 
  const std::chrono::duration<double>& duration() const {
    return m_setup_duration;
  }
 
 private:
  std::string m_name;
 
  std::chrono::steady_clock::time_point m_setup_start_time;
  std::chrono::steady_clock::time_point m_setup_stop_time;
  std::chrono::duration<double> m_setup_duration{0.0};
};
 
class SolveProfiler {
 public:
  explicit SolveProfiler(std::string_view name) : m_name{name} {}
 
  void start() {
#ifndef SLEIPNIR_DISABLE_DIAGNOSTICS
    m_current_solve_start_time = std::chrono::steady_clock::now();
#endif
  }
 
  void stop() {
#ifndef SLEIPNIR_DISABLE_DIAGNOSTICS
    m_current_solve_stop_time = std::chrono::steady_clock::now();
    m_current_solve_duration =
        m_current_solve_stop_time - m_current_solve_start_time;
    m_total_solve_duration += m_current_solve_duration;
 
    ++m_num_solves;
    m_average_solve_duration =
        (m_num_solves - 1.0) / m_num_solves * m_average_solve_duration +
        1.0 / m_num_solves * m_current_solve_duration;
#endif
  }
 
  std::string_view name() const { return m_name; }
 
  int num_solves() const { return m_num_solves; }
 
  const std::chrono::duration<double>& current_duration() const {
    return m_current_solve_duration;
  }
 
  const std::chrono::duration<double>& average_duration() const {
    return m_average_solve_duration;
  }
 
  const std::chrono::duration<double>& total_duration() const {
    return m_total_solve_duration;
  }
 
 private:
  std::string m_name;
 
  std::chrono::steady_clock::time_point m_current_solve_start_time;
  std::chrono::steady_clock::time_point m_current_solve_stop_time;
  std::chrono::duration<double> m_current_solve_duration{0.0};
  std::chrono::duration<double> m_total_solve_duration{0.0};
 
  int m_num_solves = 0;
  std::chrono::duration<double> m_average_solve_duration{0.0};
};
 
template <typename Profiler>
  requires std::same_as<Profiler, SetupProfiler> ||
           std::same_as<Profiler, SolveProfiler>
class ScopedProfiler {
 public:
  explicit ScopedProfiler(Profiler& profiler) noexcept : m_profiler{&profiler} {
    m_profiler->start();
  }
 
  ~ScopedProfiler() {
    if (m_active) {
      m_profiler->stop();
    }
  }
 
  ScopedProfiler(ScopedProfiler&& rhs) noexcept
      : m_profiler{std::move(rhs.m_profiler)}, m_active{rhs.m_active} {
    rhs.m_active = false;
  }
 
  ScopedProfiler(const ScopedProfiler&) = delete;
  ScopedProfiler& operator=(const ScopedProfiler&) = delete;
 
  void stop() {
    if (m_active) {
      m_profiler->stop();
      m_active = false;
    }
  }
 
  const std::chrono::duration<double>& current_duration() const {
    return m_profiler->current_duration();
  }
 
 private:
  Profiler* m_profiler;
  bool m_active = true;
};
 
}  // namespace slp