如何有效地检测逻辑和物理处理器的数量？ [英] How to detect number of logical and physical processors efficiently?

问题描述

当前我正在使用此功能。它工作正常，但每个查询大约需要1秒钟。因此，就我而言，我在应用程序中浪费了3秒。目前，我正在考虑使用3个线程在一秒钟内获取所有信息。

Currently I'm using this function. It works fine but each query takes about 1 second. So in my case I waste 3 seconds in my application. At the moment I'm thinking about using 3 threads to get this all information in one second.

function GetWMIstring (wmiHost, wmiClass, wmiProperty : string):string;
var  // These are all needed for the WMI querying process
  Locator:  ISWbemLocator;
  Services: ISWbemServices;
  SObject:  ISWbemObject;
  ObjSet:   ISWbemObjectSet;
  SProp:    ISWbemProperty;
  Enum:     IEnumVariant;
  Value:    Cardinal;
  TempObj:  OleVariant;
  SN: string;
begin
  Result := '';
  try
  Locator := CoSWbemLocator.Create;  // Create the Location object
  // Connect to the WMI service, with the root\cimv2 namespace
  Services := Locator.ConnectServer(wmiHost, 'root\cimv2', '', '', '','', 0, nil);
  ObjSet := Services.ExecQuery('SELECT * FROM '+wmiClass, 'WQL',
    wbemFlagReturnImmediately and wbemFlagForwardOnly , nil);
  Enum := (ObjSet._NewEnum) as IEnumVariant;
  while Enum.Next(1, TempObj, Value) = S_OK do
  begin
    try SObject := IUnknown(TempObj) as ISWBemObject; except SObject := nil; end;
    TempObj := Unassigned;  // Always need to free interface in TempObj
    if SObject <> nil then
    begin
      SProp := SObject.Properties_.Item(wmiProperty, 0);
      SN := SProp.Get_Value;
      if not VarIsNull(SN) then
      begin
        Result :=  SN;
        Break;
      end;
    end;
  end;
  except // Trap any exceptions (Not having WMI installed will cause one!)
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin

  CoInitializeEx(nil,COINIT_MULTITHREADED) ; //required !!! Otherwise "EOleSysError: CoInitialize has not been called" occurs   (Microsoft recommends CoInitializeEx instead of CoInitialize)

  CPU_PROCESSOR_COUNT := StrToInt( getWMIstring('','Win32_ComputerSystem','NumberOfProcessors') );   // number of cpu on mainboard
  CPU_PHYSICAL_CORES := StrToInt( getWMIstring('','Win32_Processor','NumberOfCores') );      // number of phisical cores
  CPU_LOGICAL_CORES := StrToInt( getWMIstring('','Win32_Processor','NumberOfLogicalProcessors') );     //number of logical cores

  CoUninitialize; //required !!!

end;

推荐答案

如果您对逻辑处理器的数量感兴趣-出于线程调度的目的，要容易得多且更早 GetSystemInfo 函数：

If you're interested in the number of logical processors - say for thread scheduling purposes, there is much easier and earlier GetSystemInfo function:

function GetNumberOfProcessors: Integer;
var
   si: TSystemInfo; //Windows.pas
begin
   GetSystemInfo({var}si);
   Result := si.dwNumberOfProcessors;
end;

几乎所有目的：

• 它们是单独的物理CPU


• 还是它们是核心


• 或每个物理CPU都没关系


• 或如果它们正在超线程虚拟内核

• it doesn't matter if they are individual physical CPUs
• or if they're cores
• or multiple physical CPUs each with multiple cores
• or if they're hyperthreading virtual cores

您想要什么 GetSystemInfo 提供。

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