75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
///
|
|
/// \author John Farrier
|
|
///
|
|
/// \copyright Copyright 2015, 2016, 2017, 2018. 2019 John Farrier
|
|
///
|
|
/// Licensed under the Apache License, Version 2.0 (the "License");
|
|
/// you may not use this file except in compliance with the License.
|
|
/// You may obtain a copy of the License at
|
|
///
|
|
/// http://www.apache.org/licenses/LICENSE-2.0
|
|
///
|
|
/// Unless required by applicable law or agreed to in writing, software
|
|
/// distributed under the License is distributed on an "AS IS" BASIS,
|
|
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
/// See the License for the specific language governing permissions and
|
|
/// limitations under the License.
|
|
///
|
|
|
|
#include <celero/Print.h>
|
|
#include <celero/Timer.h>
|
|
#include <iostream>
|
|
|
|
#ifdef WIN32
|
|
#include <Windows.h>
|
|
LARGE_INTEGER QPCFrequency;
|
|
#else
|
|
#include <chrono>
|
|
#endif
|
|
|
|
uint64_t celero::timer::GetSystemTime()
|
|
{
|
|
#ifdef WIN32
|
|
LARGE_INTEGER timeStorage;
|
|
QueryPerformanceCounter(&timeStorage);
|
|
if(QPCFrequency.QuadPart != 0)
|
|
{
|
|
return static_cast<uint64_t>(timeStorage.QuadPart * 1000000) / static_cast<uint64_t>(QPCFrequency.QuadPart);
|
|
}
|
|
|
|
return 0;
|
|
#else
|
|
auto timePoint = std::chrono::high_resolution_clock::now();
|
|
return std::chrono::duration_cast<std::chrono::microseconds>(timePoint.time_since_epoch()).count();
|
|
#endif
|
|
}
|
|
|
|
double celero::timer::CachePerformanceFrequency(bool quiet)
|
|
{
|
|
#ifdef WIN32
|
|
QueryPerformanceFrequency(&QPCFrequency);
|
|
if(QPCFrequency.QuadPart == 0)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
auto precision = ((1.0 / static_cast<double>(QPCFrequency.QuadPart)) * 1000000.0);
|
|
#else
|
|
if(static_cast<double>(std::chrono::high_resolution_clock::period::den) == 0)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
auto precision =
|
|
(static_cast<double>(std::chrono::high_resolution_clock::period::num) / static_cast<double>(std::chrono::high_resolution_clock::period::den))
|
|
* 1000000.0;
|
|
#endif
|
|
|
|
if(quiet == false)
|
|
{
|
|
std::cout << "Timer resolution: " << std::to_string(precision) << " us" << std::endl;
|
|
}
|
|
|
|
return precision;
|
|
}
|