如何在 Windows 上获取 cpu 上的实际内核数？ [复制]答案

【问题标题】：How to get the number of actual cores on the cpu on windows? [duplicate]如何在 Windows 上获取 cpu 上的实际内核数？ [复制]
【发布时间】：2015-03-06 07:05:14
【问题描述】：

我知道 std::thread::hardware_concurrency() 的存在，但它返回虚拟内核的数量。当它针对核心的物理数量时，该算法的工作最佳（5-10% 更好）。我如何在 windows 上的 c++ 中获得该数字？

【问题讨论】：

“物理核心数”正在成为一个模糊的衡量标准。 “虚拟”核心共享其所有硬件，“物理核心”不共享任何东西。您将共享 FPU 的一对内核称为什么？对于整数代码，它看起来像两个物理内核，对于 FP 代码，它看起来像 2 个虚拟内核。

标签： c++ windows

【解决方案1】：

如果您想获得实际的核心数量，这可能对您有所帮助。

#include <windows.h>
#include <malloc.h>    
#include <stdio.h>
#include <tchar.h>

typedef BOOL (WINAPI *LPFN_GLPI)(
    PSYSTEM_LOGICAL_PROCESSOR_INFORMATION, 
    PDWORD);


// Helper function to count set bits in the processor mask.
DWORD CountSetBits(ULONG_PTR bitMask)
{
    DWORD LSHIFT = sizeof(ULONG_PTR)*8 - 1;
    DWORD bitSetCount = 0;
    ULONG_PTR bitTest = (ULONG_PTR)1 << LSHIFT;    
    DWORD i;

    for (i = 0; i <= LSHIFT; ++i)
    {
        bitSetCount += ((bitMask & bitTest)?1:0);
        bitTest/=2;
    }

    return bitSetCount;
}

int _cdecl _tmain ()
{
    LPFN_GLPI glpi;
    BOOL done = FALSE;
    PSYSTEM_LOGICAL_PROCESSOR_INFORMATION buffer = NULL;
    PSYSTEM_LOGICAL_PROCESSOR_INFORMATION ptr = NULL;
    DWORD returnLength = 0;
    DWORD logicalProcessorCount = 0;
    DWORD numaNodeCount = 0;
    DWORD processorCoreCount = 0;
    DWORD processorL1CacheCount = 0;
    DWORD processorL2CacheCount = 0;
    DWORD processorL3CacheCount = 0;
    DWORD processorPackageCount = 0;
    DWORD byteOffset = 0;
    PCACHE_DESCRIPTOR Cache;

    glpi = (LPFN_GLPI) GetProcAddress(
                            GetModuleHandle(TEXT("kernel32")),
                            "GetLogicalProcessorInformation");
    if (NULL == glpi) 
    {
        _tprintf(TEXT("\nGetLogicalProcessorInformation is not supported.\n"));
        return (1);
    }

    while (!done)
    {
        DWORD rc = glpi(buffer, &returnLength);

        if (FALSE == rc) 
        {
            if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) 
            {
                if (buffer) 
                    free(buffer);

                buffer = (PSYSTEM_LOGICAL_PROCESSOR_INFORMATION)malloc(
                        returnLength);

                if (NULL == buffer) 
                {
                    _tprintf(TEXT("\nError: Allocation failure\n"));
                    return (2);
                }
            } 
            else 
            {
                _tprintf(TEXT("\nError %d\n"), GetLastError());
                return (3);
            }
        } 
        else
        {
            done = TRUE;
        }
    }

    ptr = buffer;

    while (byteOffset + sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION) <= returnLength) 
    {
        switch (ptr->Relationship) 
        {
        case RelationNumaNode:
            // Non-NUMA systems report a single record of this type.
            numaNodeCount++;
            break;

        case RelationProcessorCore:
            processorCoreCount++;

            // A hyperthreaded core supplies more than one logical processor.
            logicalProcessorCount += CountSetBits(ptr->ProcessorMask);
            break;

        case RelationCache:
            // Cache data is in ptr->Cache, one CACHE_DESCRIPTOR structure for each cache. 
            Cache = &ptr->Cache;
            if (Cache->Level == 1)
            {
                processorL1CacheCount++;
            }
            else if (Cache->Level == 2)
            {
                processorL2CacheCount++;
            }
            else if (Cache->Level == 3)
            {
                processorL3CacheCount++;
            }
            break;

        case RelationProcessorPackage:
            // Logical processors share a physical package.
            processorPackageCount++;
            break;

        default:
            _tprintf(TEXT("\nError: Unsupported LOGICAL_PROCESSOR_RELATIONSHIP value.\n"));
            break;
        }
        byteOffset += sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION);
        ptr++;
    }

    _tprintf(TEXT("\nGetLogicalProcessorInformation results:\n"));
    _tprintf(TEXT("Number of NUMA nodes: %d\n"), 
             numaNodeCount);
    _tprintf(TEXT("Number of physical processor packages: %d\n"), 
             processorPackageCount);
    _tprintf(TEXT("Number of processor cores: %d\n"), 
             processorCoreCount);
    _tprintf(TEXT("Number of logical processors: %d\n"), 
             logicalProcessorCount);
    _tprintf(TEXT("Number of processor L1/L2/L3 caches: %d/%d/%d\n"), 
             processorL1CacheCount,
             processorL2CacheCount,
             processorL3CacheCount);

    free(buffer);

    return 0;
}

参考 https://msdn.microsoft.com/en-us/library/windows/desktop/ms683194(v=vs.85).aspx

【讨论】：

【解决方案2】：

this MSDN page 引用的函数是您的朋友。该页面上的示例打印出处理器内核的数量和逻辑处理器内核的数量。

【讨论】：