c++ - 查找服务器机器中的物理 CPU 插槽数

Question

我有一个带有 4 个物理处理器插槽的系统。运行 Windows 2003，我想使用 C++ 以编程方式查找套接字的数量。这可能吗？如果可以，怎么做？

Answer 1

对于 Windows 7 和 2008 服务器，有GetActiveProcessorGroupCount 函数。但是你有 2003 服务器，所以它不是一个选项。

在 C++ 中，这需要编写 WMI 消费者代码，这是一个笨拙而无聊的 (D)COM 东西。

一个不错的解决方案是运行systeminfo命令并解析输出，但要小心，因为输出的列标题已本地化为系统的区域设置。

编辑

刚刚找到了一个更好的解决方案，它利用 WMI 的命令行界面。

运行以下命令并解析输出，每个套接字有一行

> wmic.exe cpu get
AddressWidth  Architecture  Availability  Caption                               ConfigManagerErrorCode  ConfigManagerUserConfig  CpuStatus  CreationClassName  CurrentClockSpeed  CurrentVoltage  DataWidth  Description                           DeviceID  ErrorCleared  ErrorDescription  ExtClock  Family  InstallDate  L2CacheSize  L2CacheSpeed  L3CacheSize  L3CacheSpeed  LastErrorCode  Level  LoadPercentage  Manufacturer  MaxClockSpeed  Name                                             NumberOfCores  NumberOfLogicalProcessors  OtherFamilyDescription  PNPDeviceID  PowerManagementCapabilities  PowerManagementSupported  ProcessorId       ProcessorType  Revision  Role  SocketDesignation  Status  StatusInfo  Stepping  SystemCreationClassName  SystemName       UniqueId  UpgradeMethod  Version  VoltageCaps  
64            9             3             Intel64 Family 6 Model 23 Stepping 6                                                   1          Win32_Processor    2532               33              64         Intel64 Family 6 Model 23 Stepping 6  CPU0                                      421       2                                               0            0                            6      1               GenuineIntel  2532           Intel(R) Core(TM)2 Duo CPU     T9400  @ 2.53GHz  2              2                                                                                            FALSE                     BFEBFBFF00010676  3              5894      CPU   CPU Socket #0      OK      3                     Win32_ComputerSystem     CHBROSSO-WIN7VM            1                       2            

在 C++ 中运行 exe 和解析输出应该是最容易的部分。您还可以使用 POCO 库或 Boost.Process 来获得更简洁的代码。

（这是未经测试的代码）

//get wmic program output 
FILE* pipe = _popen("wmic.exe cpu get", "r");
if (!pipe) throw std::exception("error");
char buffer[128];
std::string output;
while(!feof(pipe)) {
  if(fgets(buffer, 128, pipe) != NULL)
      output += buffer;
}
_pclose(pipe);

//split lines to a vector<string>
std::stringstream oss(output);
std::vector<std::string> processor_description; std::string buffer;
while (std::getline(oss, buffer))
  processor_description.push_back(buffer);
//processor_description has n+1 elements, n being nb of sockets, +1 is the header of columns

Answer 2

您将使用 C++ 找到套接字的数量。 https://msdn.microsoft.com/en-us/library/windows/desktop/ms683194(v=vs.85).aspx

#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 sockets: %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;
}