How Can I Determine the Number of Physical, Core, and Logical Processors in .NET/C#?

Determine the number of CPU cores in .NET/C#

Introduction:

Determining the number of CPU cores is critical to optimizing code performance and leveraging hardware capabilities. .NET and C# provide several techniques for obtaining this information.

Processor and Cores:

Processor-related terms are as follows:

• Physical Processor: The actual CPU chip present in the system.
• Core: A single processing unit within a physical processor.
• Logical Processors: The total number of virtual processors available to the operating system.

These values ​​may vary, especially on systems with multi-core processors and hyper-threading.

Find the number of cores:

Physical processor:

To determine the number of physical processors, use 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"]);
}

Core:

To get the number of cores, use 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("核心数量：{0}", coreCount);

Logical Processor:

The System.Environment class allows direct access to the number of logical processors:

Console.WriteLine("逻辑处理器数量：{0}", Environment.ProcessorCount);

Note: Remember to include a reference to System.Management.dll in your project.

Exclude processors in Windows:

It is possible to discover processors that have been excluded by Windows using the Windows API, for example via boot settings:

static void Main(string[] args)
{
    int deviceCount = 0;
    IntPtr deviceList = IntPtr.Zero;
    // ... (代码省略)
}

This method provides a more comprehensive description of the total number of processors present in the system.

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