ITK  5.3.0
Insight Toolkit
SphinxExamples/src/Core/Common/TraceMemoryBetweenPoints/Code.cxx
/*=========================================================================
*
* Copyright NumFOCUS
*
* 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.txt
*
* 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 "itkMemoryProbe.h"
#include <iostream>
int
main(int argc, char * argv[])
{
if (argc != 2)
{
std::cerr << "Usage:" << std::endl;
std::cerr << argv[0] << " <Size of the array>" << std::endl;
return EXIT_FAILURE;
}
const auto N = static_cast<unsigned int>(std::stoi(argv[1]));
if (N == 0)
{
std::cerr << "Size of the array should be non null" << std::endl;
return EXIT_FAILURE;
}
itk::MemoryProbe memoryProbe;
memoryProbe.Start();
std::cout << "We are measuring " << memoryProbe.GetType();
std::cout << " in units of " << memoryProbe.GetUnit() << ".\n" << std::endl;
memoryProbe.Stop();
// Expect zeros here
std::cout << "** Start **" << std::endl;
std::cout << "Mean: " << memoryProbe.GetMean() << std::endl;
std::cout << "Total: " << memoryProbe.GetTotal() << std::endl;
std::cout << std::endl;
memoryProbe.Start();
auto * a = new char[N];
// The memory must be used for it to be counted.
for (unsigned int i = 0; i < N; ++i)
{
a[i] = static_cast<char>(i * i);
}
memoryProbe.Stop();
std::cout << "** After allocation **" << std::endl;
std::cout << "Mean: " << memoryProbe.GetMean() << std::endl;
std::cout << "Total: " << memoryProbe.GetTotal() << std::endl;
std::cout << std::endl;
memoryProbe.Start();
delete[] a;
memoryProbe.Stop();
std::cout << "** After deallocation **" << std::endl;
std::cout << "Mean: " << memoryProbe.GetMean() << std::endl;
std::cout << "Total: " << memoryProbe.GetTotal() << std::endl;
return EXIT_SUCCESS;
}
itk::ResourceProbe::Stop
virtual void Stop()
itk::ResourceProbe::GetType
std::string GetType() const
itkMemoryProbe.h
itk::ResourceProbe::GetTotal
virtual ValueType GetTotal() const
itk::MemoryProbe
Computes the memory allocated between two points in code.
Definition: itkMemoryProbe.h:39
itk::ResourceProbe::Start
virtual void Start()
itk::ResourceProbe::GetMean
virtual MeanType GetMean() const
itk::ResourceProbe::GetUnit
std::string GetUnit() const