Как узнать количество физических ядер - C/C++ - Ответ 16746760

#include <windows.h>
#include <iostream>
#include <tuple>
 
std::tuple<DWORD, DWORD> GetPhysicalProcessorCount()
{
    DWORD bufferSize = 0;
    GetLogicalProcessorInformation(NULL, &bufferSize);
 
    SYSTEM_LOGICAL_PROCESSOR_INFORMATION *buffer = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION *)malloc(bufferSize);
    GetLogicalProcessorInformation(buffer, &bufferSize);
 
    DWORD processorCoreCount = 0;
    DWORD processorPackageCount = 0;
 
    DWORD byteOffset = 0;
    SYSTEM_LOGICAL_PROCESSOR_INFORMATION *ptr = buffer;
    while (byteOffset < bufferSize)
    {
        if (ptr->Relationship == RelationProcessorCore)
        {
            processorCoreCount++;
            if (ptr->ProcessorCore.Flags)
            {
                processorPackageCount++;
            }
        }
        byteOffset += sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION);
        ptr++;
    }
 
    free(buffer);
 
    return std::make_tuple(processorCoreCount, processorPackageCount);
}
 
int main()
{
    DWORD numPhysicalCores = 0;
    DWORD numPhysicalPackages = 0;
    std::tie(numPhysicalCores, numPhysicalPackages) = GetPhysicalProcessorCount();
 
    std::cout << "Number of physical cores: " << numPhysicalCores << std::endl;
    std::cout << "Number of physical packages: " << numPhysicalPackages << std::endl;
 
    return 0;
}