1#ifndef BENCHMARK_TIMERS_H 2#define BENCHMARK_TIMERS_H 3 4#include <chrono> 5#include <string> 6 7namespace benchmark { 8 9// Return the CPU usage of the current process 10double ProcessCPUUsage(); 11 12// Return the CPU usage of the children of the current process 13double ChildrenCPUUsage(); 14 15// Return the CPU usage of the current thread 16double ThreadCPUUsage(); 17 18#if defined(HAVE_STEADY_CLOCK) 19template <bool HighResIsSteady = std::chrono::high_resolution_clock::is_steady> 20struct ChooseSteadyClock { 21 typedef std::chrono::high_resolution_clock type; 22}; 23 24template <> 25struct ChooseSteadyClock<false> { 26 typedef std::chrono::steady_clock type; 27}; 28#endif 29 30struct ChooseClockType { 31#if defined(HAVE_STEADY_CLOCK) 32 typedef ChooseSteadyClock<>::type type; 33#else 34 typedef std::chrono::high_resolution_clock type; 35#endif 36}; 37 38inline double ChronoClockNow() { 39 typedef ChooseClockType::type ClockType; 40 using FpSeconds = std::chrono::duration<double, std::chrono::seconds::period>; 41 return FpSeconds(ClockType::now().time_since_epoch()).count(); 42} 43 44std::string LocalDateTimeString(); 45 46} // end namespace benchmark 47 48#endif // BENCHMARK_TIMERS_H 49