| 1 | #ifndef BENCHMARK_THREAD_TIMER_H |
|---|---|
| 2 | #define BENCHMARK_THREAD_TIMER_H |
| 3 | |
| 4 | #include "check.h" |
| 5 | #include "timers.h" |
| 6 | |
| 7 | namespace benchmark { |
| 8 | namespace internal { |
| 9 | |
| 10 | class ThreadTimer { |
| 11 | explicit ThreadTimer(bool measure_process_cpu_time_) |
| 12 | : measure_process_cpu_time(measure_process_cpu_time_) {} |
| 13 | |
| 14 | public: |
| 15 | static ThreadTimer Create() { |
| 16 | return ThreadTimer(/*measure_process_cpu_time_=*/false); |
| 17 | } |
| 18 | static ThreadTimer CreateProcessCpuTime() { |
| 19 | return ThreadTimer(/*measure_process_cpu_time_=*/true); |
| 20 | } |
| 21 | |
| 22 | // Called by each thread |
| 23 | void StartTimer() { |
| 24 | running_ = true; |
| 25 | start_real_time_ = ChronoClockNow(); |
| 26 | start_cpu_time_ = ReadCpuTimerOfChoice(); |
| 27 | } |
| 28 | |
| 29 | // Called by each thread |
| 30 | void StopTimer() { |
| 31 | BM_CHECK(running_); |
| 32 | running_ = false; |
| 33 | real_time_used_ += ChronoClockNow() - start_real_time_; |
| 34 | // Floating point error can result in the subtraction producing a negative |
| 35 | // time. Guard against that. |
| 36 | cpu_time_used_ += |
| 37 | std::max<double>(a: ReadCpuTimerOfChoice() - start_cpu_time_, b: 0); |
| 38 | } |
| 39 | |
| 40 | // Called by each thread |
| 41 | void SetIterationTime(double seconds) { manual_time_used_ += seconds; } |
| 42 | |
| 43 | bool running() const { return running_; } |
| 44 | |
| 45 | // REQUIRES: timer is not running |
| 46 | double real_time_used() const { |
| 47 | BM_CHECK(!running_); |
| 48 | return real_time_used_; |
| 49 | } |
| 50 | |
| 51 | // REQUIRES: timer is not running |
| 52 | double cpu_time_used() const { |
| 53 | BM_CHECK(!running_); |
| 54 | return cpu_time_used_; |
| 55 | } |
| 56 | |
| 57 | // REQUIRES: timer is not running |
| 58 | double manual_time_used() const { |
| 59 | BM_CHECK(!running_); |
| 60 | return manual_time_used_; |
| 61 | } |
| 62 | |
| 63 | private: |
| 64 | double ReadCpuTimerOfChoice() const { |
| 65 | if (measure_process_cpu_time) return ProcessCPUUsage(); |
| 66 | return ThreadCPUUsage(); |
| 67 | } |
| 68 | |
| 69 | // should the thread, or the process, time be measured? |
| 70 | const bool measure_process_cpu_time; |
| 71 | |
| 72 | bool running_ = false; // Is the timer running |
| 73 | double start_real_time_ = 0; // If running_ |
| 74 | double start_cpu_time_ = 0; // If running_ |
| 75 | |
| 76 | // Accumulated time so far (does not contain current slice if running_) |
| 77 | double real_time_used_ = 0; |
| 78 | double cpu_time_used_ = 0; |
| 79 | // Manually set iteration time. User sets this with SetIterationTime(seconds). |
| 80 | double manual_time_used_ = 0; |
| 81 | }; |
| 82 | |
| 83 | } // namespace internal |
| 84 | } // namespace benchmark |
| 85 | |
| 86 | #endif // BENCHMARK_THREAD_TIMER_H |
| 87 |