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timer.hpp
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#ifndef _VIENNACL_TOOLS_TIMER_HPP_
#define _VIENNACL_TOOLS_TIMER_HPP_
/* =========================================================================
Copyright (c) 2010-2016, Institute for Microelectronics,
Institute for Analysis and Scientific Computing,
TU Wien.
Portions of this software are copyright by UChicago Argonne, LLC.
-----------------
ViennaCL - The Vienna Computing Library
-----------------
Project Head: Karl Rupp rupp@iue.tuwien.ac.at
(A list of authors and contributors can be found in the manual)
License: MIT (X11), see file LICENSE in the base directory
============================================================================= */
#include <iostream>
#ifdef _WIN32
#define WINDOWS_LEAN_AND_MEAN
#include <windows.h>
#undef min
#undef max
namespace viennacl
{
namespace tools
{
class timer
{
public:
timer()
{
QueryPerformanceFrequency(&freq);
}
void start()
{
QueryPerformanceCounter((LARGE_INTEGER*) &start_time);
}
double get() const
{
LARGE_INTEGER elapsed;
QueryPerformanceCounter((LARGE_INTEGER*) &end_time);
elapsed.QuadPart = end_time.QuadPart - start_time.QuadPart;
return elapsed.QuadPart / static_cast<double>(freq.QuadPart);
}
private:
LARGE_INTEGER freq;
LARGE_INTEGER start_time;
LARGE_INTEGER end_time;
};
}
}
#else
#include <sys/time.h>
namespace viennacl
{
namespace tools
{
class timer
{
public:
timer() : ts(0)
{}
void start()
{
struct timeval tval;
gettimeofday(&tval, NULL);
ts = static_cast<double>(tval.tv_sec * 1000000 + tval.tv_usec);
}
double get() const
{
struct timeval tval;
gettimeofday(&tval, NULL);
double end_time = static_cast<double>(tval.tv_sec * 1000000 + tval.tv_usec);
return static_cast<double>(end_time-ts) / 1000000.0;
}
private:
double ts;
};
}
}
#endif
#endif
viennacl::tools::timer
Simple timer class based on gettimeofday (POSIX) or QueryPerformanceCounter (Windows).
Definition: timer.hpp:90
viennacl::tools::timer::start
void start()
Definition: timer.hpp:97
viennacl::tools::timer::timer
timer()
Definition: timer.hpp:94