


How to Determine the Number of Physical, Logical, and Available CPU Cores in .NET/C#?
Use .NET/C# to detect the number of CPU cores
With the increasing popularity of multi-processing, it is crucial to determine the number of CPU cores for optimal performance. In .NET/C#, there are several ways to access this information:
Physical Processor
The number of physical processors can be retrieved using the following code:
foreach (var item in new System.Management.ManagementObjectSearcher("Select * from Win32_ComputerSystem").Get()) { Console.WriteLine("物理处理器数量:{0}", item["NumberOfProcessors"]); }
Kernel
To determine the number of cores, execute the following code:
int coreCount = 0; foreach (var item in new System.Management.ManagementObjectSearcher("Select * from Win32_Processor").Get()) { coreCount += int.Parse(item["NumberOfCores"].ToString()); } Console.WriteLine("内核数量:{0}", coreCount);
Logical Processor
The number of logical processors (often called hyperthreads) can be obtained using either of the following codes:
Console.WriteLine("逻辑处理器数量:{0}", Environment.ProcessorCount);
foreach (var item in new System.Management.ManagementObjectSearcher("Select * from Win32_ComputerSystem").Get()) { Console.WriteLine("逻辑处理器数量:{0}", item["NumberOfLogicalProcessors"]); }
Excluded Processors
In some Windows configurations, specific processors may be excluded from detection. To do this you can use the Windows API call found in setupapi.dll:
static void Main(string[] args) { int deviceCount = 0; IntPtr deviceList = IntPtr.Zero; try { deviceList = SetupDiGetClassDevs(ref processorGuid, "ACPI", IntPtr.Zero, (int)DIGCF.PRESENT); for (int deviceNumber = 0; ; deviceNumber++) { SP_DEVINFO_DATA deviceInfo = new SP_DEVINFO_DATA(); deviceInfo.cbSize = Marshal.SizeOf(deviceInfo); if (!SetupDiEnumDeviceInfo(deviceList, deviceNumber, ref deviceInfo)) { deviceCount = deviceNumber; break; } } } finally { if (deviceList != IntPtr.Zero) { SetupDiDestroyDeviceInfoList(deviceList); } } Console.WriteLine("内核数量:{0}", deviceCount); } [DllImport("setupapi.dll", SetLastError = true)] private static extern IntPtr SetupDiGetClassDevs(ref Guid ClassGuid, [MarshalAs(UnmanagedType.LPStr)]String enumerator, IntPtr hwndParent, Int32 Flags); [DllImport("setupapi.dll", SetLastError = true)] private static extern Int32 SetupDiDestroyDeviceInfoList(IntPtr DeviceInfoSet); [DllImport("setupapi.dll", SetLastError = true)] private static extern bool SetupDiEnumDeviceInfo(IntPtr DeviceInfoSet, Int32 MemberIndex, ref SP_DEVINFO_DATA DeviceInterfaceData); [StructLayout(LayoutKind.Sequential)] private struct SP_DEVINFO_DATA { public int cbSize; public Guid ClassGuid; public uint DevInst; public IntPtr Reserved; } private enum DIGCF { DEFAULT = 0x1, PRESENT = 0x2, ALLCLASSES = 0x4, PROFILE = 0x8, DEVICEINTERFACE = 0x10, } private static readonly Guid processorGuid = new Guid("{4d36e968-e325-11ce-bfc1-08002be10318}");
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