Windows Server / Datacenter:将CPU关联设置为64核以上

Question

SetThreadAffinityMask()允许用户为64个逻辑核心(处理器)设置关联掩码。但是，Windows Datacenter最多可以有64个CPU，每个CPU都有多个核心(请参见here)。

如何设置大于64核的线程？

Ps。我是用C#编写的，所以.Net答案是理想的，但是用C语言也可以。

Answer 1

我使用以下代码来设置处理器组和CPU的亲和性：

[StructLayout(LayoutKind.Sequential, Pack = 4)]
private struct _GROUP_AFFINITY
{
    public UIntPtr Mask;
    [MarshalAs(UnmanagedType.U2)]
    public ushort Group;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3, ArraySubType = UnmanagedType.U2)]
    public ushort[] Reserved;
}

[DllImport("kernel32", SetLastError = true)]
private static extern Boolean SetThreadGroupAffinity(
    IntPtr hThread,
    ref _GROUP_AFFINITY GroupAffinity,
    ref _GROUP_AFFINITY PreviousGroupAffinity);

[DllImport("kernel32", SetLastError = true)]
private static extern IntPtr GetCurrentThread();

/// <summary>
/// Sets the processor group and the processor cpu affinity of the current thread.
/// </summary>
/// <param name="group">A processor group number.</param>
/// <param name="cpus">A list of CPU numbers. The values should be
/// between 0 and <see cref="Environment.ProcessorCount"/>.</param>
public static void SetThreadProcessorAffinity(ushort groupId, params int[] cpus)
{
    if (cpus == null) throw new ArgumentNullException(nameof(cpus));
    if (cpus.Length == 0) throw new ArgumentException("You must specify at least one CPU.", nameof(cpus));

    // Supports up to 64 processors
    long cpuMask = 0;
    foreach (var cpu in cpus)
    {
        if (cpu < 0 || cpu >= Environment.ProcessorCount)
            throw new ArgumentException("Invalid CPU number.");

        cpuMask |= 1L << cpu;
    }

    var hThread = GetCurrentThread();
    var previousAffinity = new _GROUP_AFFINITY {Reserved = new ushort[3]};
    var newAffinity = new _GROUP_AFFINITY
    {
        Group = groupId,
        Mask = new UIntPtr((ulong) cpuMask),
        Reserved = new ushort[3]
    };

    SetThreadGroupAffinity(hThread, ref newAffinity, ref previousAffinity);
}

Answer 2

根据MSDN的说法，SetThreadAffinityMask()设置当前处理器组的亲和性，每个处理器组可以有64个逻辑核心。使用SetThreadGroupAffinity()更改您的组。有关详细信息，请参阅http://msdn.microsoft.com/en-us/library/windows/desktop/dd405503(v=vs.85).aspx。

Answer 3

为了使用64个以上的CPU，必须将处理器组考虑在内。详情请参考MSDN：

Processor Groups