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