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authorAnton Samokhvalov <pg83@yandex.ru>2022-02-10 16:45:15 +0300
committerDaniil Cherednik <dcherednik@yandex-team.ru>2022-02-10 16:45:15 +0300
commit72cb13b4aff9bc9cf22e49251bc8fd143f82538f (patch)
treeda2c34829458c7d4e74bdfbdf85dff449e9e7fb8 /util/system/hp_timer.cpp
parent778e51ba091dc39e7b7fcab2b9cf4dbedfb6f2b5 (diff)
downloadydb-72cb13b4aff9bc9cf22e49251bc8fd143f82538f.tar.gz
Restoring authorship annotation for Anton Samokhvalov <pg83@yandex.ru>. Commit 1 of 2.
Diffstat (limited to 'util/system/hp_timer.cpp')
-rw-r--r--util/system/hp_timer.cpp104
1 files changed, 52 insertions, 52 deletions
diff --git a/util/system/hp_timer.cpp b/util/system/hp_timer.cpp
index e4c3f21e6b..27f97a9b2b 100644
--- a/util/system/hp_timer.cpp
+++ b/util/system/hp_timer.cpp
@@ -1,104 +1,104 @@
#include "hp_timer.h"
-
+
#include <util/generic/algorithm.h>
-#include <util/generic/singleton.h>
-#include <util/datetime/cputimer.h>
-
+#include <util/generic/singleton.h>
+#include <util/datetime/cputimer.h>
+
using namespace NHPTimer;
-namespace {
- struct TFreq {
- inline TFreq()
- : Freq(InitHPTimer())
+namespace {
+ struct TFreq {
+ inline TFreq()
+ : Freq(InitHPTimer())
, Rate(1.0 / Freq)
, CyclesPerSecond(static_cast<ui64>(Rate))
- {
+ {
}
-
- static inline const TFreq& Instance() {
+
+ static inline const TFreq& Instance() {
return *SingletonWithPriority<TFreq, 1>();
}
- static double EstimateCPUClock() {
- for (;;) {
+ static double EstimateCPUClock() {
+ for (;;) {
ui64 startCycle = 0;
ui64 startMS = 0;
-
+
for (;;) {
startMS = MicroSeconds();
startCycle = GetCycleCount();
-
+
ui64 n = MicroSeconds();
if (n - startMS < 100) {
break;
}
- }
-
+ }
+
Sleep(TDuration::MicroSeconds(5000));
-
+
ui64 finishCycle = 0;
ui64 finishMS = 0;
-
+
for (;;) {
finishMS = MicroSeconds();
-
+
if (finishMS - startMS < 100) {
continue;
}
-
+
finishCycle = GetCycleCount();
-
+
ui64 n = MicroSeconds();
-
+
if (n - finishMS < 100) {
break;
}
- }
+ }
if (startMS < finishMS && startCycle < finishCycle) {
return (finishCycle - startCycle) * 1000000.0 / (finishMS - startMS);
}
- }
- }
-
- static double InitHPTimer() {
- const size_t N_VEC = 9;
-
- double vec[N_VEC];
-
+ }
+ }
+
+ static double InitHPTimer() {
+ const size_t N_VEC = 9;
+
+ double vec[N_VEC];
+
for (auto& i : vec) {
i = EstimateCPUClock();
- }
-
- Sort(vec, vec + N_VEC);
-
- return 1.0 / vec[N_VEC / 2];
- }
-
- inline double GetSeconds(const STime& a) const {
- return static_cast<double>(a) * Freq;
- }
-
- inline double GetClockRate() const {
+ }
+
+ Sort(vec, vec + N_VEC);
+
+ return 1.0 / vec[N_VEC / 2];
+ }
+
+ inline double GetSeconds(const STime& a) const {
+ return static_cast<double>(a) * Freq;
+ }
+
+ inline double GetClockRate() const {
return Rate;
- }
-
+ }
+
inline ui64 GetCyclesPerSecond() const {
return CyclesPerSecond;
}
- const double Freq;
+ const double Freq;
const double Rate;
const ui64 CyclesPerSecond;
- };
+ };
}
double NHPTimer::GetSeconds(const STime& a) noexcept {
- return TFreq::Instance().GetSeconds(a);
+ return TFreq::Instance().GetSeconds(a);
}
double NHPTimer::GetClockRate() noexcept {
- return TFreq::Instance().GetClockRate();
+ return TFreq::Instance().GetClockRate();
}
ui64 NHPTimer::GetCyclesPerSecond() noexcept {
@@ -111,8 +111,8 @@ void NHPTimer::GetTime(STime* pTime) noexcept {
double NHPTimer::GetTimePassed(STime* pTime) noexcept {
STime old(*pTime);
-
+
*pTime = GetCycleCount();
-
+
return GetSeconds(*pTime - old);
}