opencl_bitonic_sort_by_key/Timer.cpp at master · FROL256/opencl_bitonic_sort_by_key · GitHub

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#include "Timer.h"

#include <stdexcept>

#ifdef WIN32

  #include <windows.h>

  #ifdef max
    #undef max
  #endif

  #ifdef min
    #undef min
  #endif

#endif

//------------------------------------------------------------------------

double Timer::s_ticksToSecsCoef    = -1.0;
long long int Timer::s_prevTicks   = 0;

//------------------------------------------------------------------------

float Timer::end(void)
{
  long long int elapsed = getElapsedTicks();
  m_startTicks += elapsed;
  m_totalTicks += elapsed;
  return ticksToSecs(elapsed);
}

inline long long int max(long long int a, long long int b) { return a > b ? a : b; }
inline double max(double a, double b) { return a > b ? a : b; }

long long int Timer::getElapsedTicks(void)
{
  long long int curr = queryTicks();
  if (m_startTicks == -1)
    m_startTicks = curr;
  return curr - m_startTicks;
}


#ifdef WIN32

//------------------------------------------------------------------------


long long int Timer::queryTicks(void)
{
    LARGE_INTEGER ticks;
    if (!QueryPerformanceCounter(&ticks))
      throw std::runtime_error("QueryPerformanceFrequency failed");

    s_prevTicks = max(s_prevTicks, ticks.QuadPart);
    return s_prevTicks;
}

//------------------------------------------------------------------------

float Timer::ticksToSecs(long long int ticks)
{
    if (s_ticksToSecsCoef == -1.0)
    {
        LARGE_INTEGER freq;
        if (!QueryPerformanceFrequency(&freq))
          throw std::runtime_error("QueryPerformanceFrequency failed");
        s_ticksToSecsCoef = max(1.0 / (double)freq.QuadPart, 0.0);
    }

    return (float)(ticks * s_ticksToSecsCoef);
}

//------------------------------------------------------------------------


#else

#include <time.h>

long long int Timer::queryTicks(void)
{
  s_prevTicks = clock();
  return 0;
}

//------------------------------------------------------------------------

float Timer::ticksToSecs(long long int ticks)
{
  const clock_t end_time = clock();
  float elapsed = float(end_time - s_prevTicks)/CLOCKS_PER_SEC;
  return elapsed;
}

#endif