utils/benchmark/src/timers.h

   1 #ifndef BENCHMARK_TIMERS_H
   2 #define BENCHMARK_TIMERS_H
   3
   4 #include <chrono>
   5 #include <string>
   6
   7 namespace benchmark {
   8
   9 // Return the CPU usage of the current process
  10 double ProcessCPUUsage();
  11
  12 // Return the CPU usage of the children of the current process
  13 double ChildrenCPUUsage();
  14
  15 // Return the CPU usage of the current thread
  16 double ThreadCPUUsage();
  17
  18 #if defined(HAVE_STEADY_CLOCK)
  19 template <bool HighResIsSteady = std::chrono::high_resolution_clock::is_steady>
  20 struct ChooseSteadyClock {
  21   typedef std::chrono::high_resolution_clock type;
  22 };
  23
  24 template <>
  25 struct ChooseSteadyClock<false> {
  26   typedef std::chrono::steady_clock type;
  27 };
  28 #endif
  29
  30 struct 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
  38 inline 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
  44 std::string LocalDateTimeString();
  45
  46 }  // end namespace benchmark
  47
  48 #endif  // BENCHMARK_TIMERS_H