算法计算不同类型的内存

Question

我正在努力计算记忆力.我使用以下代码计算了Available,InUse,Free和Cached

  ObjectQuery wql = new ObjectQuery("SELECT * FROM Win32_OperatingSystem");
            ManagementObjectSearcher searcher = new ManagementObjectSearcher(wql);
            ManagementObjectCollection results = searcher.Get();

            //total amount of free physical memory in bytes
            var Available = new ComputerInfo().AvailablePhysicalMemory;
            //total amount of physical memory in bytes
            var Total = new ComputerInfo().TotalPhysicalMemory;

            var PhysicalMemoryInUse = Total - Available;
            Object Free = new object();
            foreach (var result in results)
            {
                //Free amount
                Free = result["FreePhysicalMemory"];
            } 
            var Cached = Total - PhysicalMemoryInUse - UInt64.Parse(Free.ToString());

如何计算Windows中资源监视器中显示的待机,硬件保留和修改内存？

Answer 1

保留的硬件是物理安装的内存量与OS报告的物理内存总量之间的差异.

其他信息可以通过性能计数器检索.我在下面有一个示例类,但是知道这不是一个强大的实现.您需要添加适当的错误处理和资源清理.但是,缓存此类的实例并Refresh()在需要时通过更新值应该可以很好地执行.

public sealed class MemoryInfo : IDisposable
{
    [DllImport("kernel32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool GetPhysicallyInstalledSystemMemory(out ulong memoryInKilobytes);

    private readonly PerformanceCounter availableCounter;
    private readonly PerformanceCounter modifiedCounter;
    private readonly PerformanceCounter freeCounter;
    private readonly PerformanceCounter standbyCoreCounter;
    private readonly PerformanceCounter standbyNormalCounter;
    private readonly PerformanceCounter standbyReserveCounter;

    private ulong osTotalMemory;

    public ulong ModifiedBytes { get; private set; }
    public ulong InUseBytes { get; private set; }
    public ulong StandbyBytes { get; private set; }
    public ulong FreeBytes { get; private set; }
    public ulong HardwareReserved { get; }

    public MemoryInfo()
    {
        var computerInfo = new ComputerInfo();

        osTotalMemory = computerInfo.TotalPhysicalMemory;

        ulong installedPhysicalMemInKb;
        GetPhysicallyInstalledSystemMemory(out installedPhysicalMemInKb);

        this.HardwareReserved = installedPhysicalMemInKb * 1024 - osTotalMemory;

        modifiedCounter = new PerformanceCounter("Memory", "Modified Page List Bytes");
        standbyCoreCounter = new PerformanceCounter("Memory", "Standby Cache Core Bytes");
        standbyNormalCounter = new PerformanceCounter("Memory", "Standby Cache Normal Priority Bytes");
        standbyReserveCounter = new PerformanceCounter("Memory", "Standby Cache Reserve Bytes");
        freeCounter = new PerformanceCounter("Memory", "Free & Zero Page List Bytes");
        availableCounter = new PerformanceCounter("Memory", "Available Bytes");

        Refresh();
    }

    public void Refresh()
    {
        ModifiedBytes = (ulong)modifiedCounter.NextSample().RawValue;
        StandbyBytes = (ulong)standbyCoreCounter.NextSample().RawValue +
                       (ulong)standbyNormalCounter.NextSample().RawValue +
                       (ulong)standbyReserveCounter.NextSample().RawValue;
        FreeBytes = (ulong)freeCounter.NextSample().RawValue;
        InUseBytes = osTotalMemory - (ulong) availableCounter.NextSample().RawValue;

    }

    public void Dispose()
    {
        modifiedCounter.Dispose();
        standbyCoreCounter.Dispose();
        standbyNormalCounter.Dispose();
        standbyReserveCounter.Dispose();
        freeCounter.Dispose();
        availableCounter.Dispose();
    }
}

这样做有一些缺点,比如perf计数器没有组合在一起,所以你不会在特定的时间点获得系统内存的"真实"快照.您可以使用PInvoke直接使用Pdh*win32 api函数来改进它.

您也可以将其更改为使用WMI(数据输入Win32_PerfRawData_PerfOS_Memory),但我不知道它将如何执行.