TimerUtility.cpp
#include "TimerUtility.h"
#include <chrono>
using namespace std::chrono;
namespace Microsoft { namespace MSR { namespace CNTK {
void Timer::Start()
{
m_start = Clock::GetTimeStamp();
}
void Timer::Restart()
{
m_start = m_end = 0;
Start();
}
void Timer::Stop()
{
m_end = Clock::GetTimeStamp();
}
double Timer::ElapsedSeconds()
{
if (m_start == 0)
{
return 0.0; // the timer hasn't been started yet
}
long long diff = 0;
if (m_end != 0)
{
diff = m_end - m_start;
}
else
{
diff = Clock::GetTimeStamp() - m_start;
}
if (diff < 0)
{
diff = 0;
}
high_resolution_clock::duration dur(diff);
long long nsec = duration_cast<nanoseconds>(dur).count();
return static_cast<double>(nsec) / 1e9;
}
long long Clock::GetTimeStamp()
{
// This takes 20-30 ns.
return high_resolution_clock::now().time_since_epoch().count();
}
long long Clock::GetTicksPerSecond()
{
typedef high_resolution_clock::period TickPeriod;
static_assert(TickPeriod::den % TickPeriod::num == 0, "Ticks per second is not an integer");
return TickPeriod::den / TickPeriod::num;
}
}}}