fireusage/usage.h

#pragma once

#include <sys/resource.h>
#include <chrono>
#include <string>

namespace fireusage {

class UsageTracker {
 public:
  void AddEvents(uint64_t num);
  void AddEvent();

  void Start();
  void Stop();
  void Log(const std::string_view& title = "");

 private:
  bool running_ = false;
  uint64_t events_ = 0;
  std::chrono::nanoseconds wall_time_;
  std::chrono::nanoseconds user_time_;
  std::chrono::nanoseconds sys_time_;
  uint64_t vol_ctxt_sw_ = 0;
  uint64_t invol_ctxt_sw_ = 0;

  std::chrono::steady_clock::time_point start_time_;
  rusage start_usage_;
};

}  // namespace fireusage