C# · 12月 27, 2021

c# – 如何限制进程的CPU使用率

我想创建一个程序,即使在计算机空闲时也可以限制一个进程的cpu使用.
我已经制定了一个程序来设置进程的优先级,但如果计算机空闲,那么cpu的使用率可以达到95%.
该过程包含“元素”是我要限制的过程 private static readonly string[] RestrictedProcess = new[] { “element” }; static void ProcessChecker(object o) { List<Process> resProc = new List<Process>(); foreach(Process p in Process.GetProcesses()) { string s = p.ProcessName; foreach(string rp in RestrictedProcess) { s = s.ToLower(); if (s.Contains(rp)) resProc.Add(p); } } foreach(Process p in resProc) { p.PriorityBoostEnabled = false; p.PriorityClass = ProcessPriorityClass.Idle; p.MaxWorkingSet = new IntPtr(20000000); } SetPowerConfig(resProc.Count > 0 ? PowerOption.GreenComputing : PowerOption.Balanced); }

提前致谢…

解决方法 如果您要限制的程序不是您的程序,则有几个选项:

>将进程优先级设置为空闲,并且不要限制cpu使用率,因为在任何情况下尽可能使用cpu.如果有一些有用的东西,那么让你的cpu运行100%是可行的.如果优先级空闲,则如果另一个程序需要cpu,则该特定进程的cpu使用率将会降低.
>如果您的系统是多核或多cpu,那么您可能需要设置processor affinity.这将告诉您的程序只使用您希望他使用的处理器.例如,如果您的程序是多线程的,并且能够消耗您的两个cpu的100%,则将其亲和力设置为仅使用一个cpu.那么他的使用量将只有50%.
>最差的选项,但实际使用的90%的“cpu限制程序”你会发现在网络上:衡量一个进程的cpu使用情况,并暂停和恢复它定期,直到cpu使用率达到你想要的值.

要暂停/恢复不是您的进程,您必须使用P / Invoke(并且这需要访问该进程,因此,如果您是Windows Vista或更高版本,请关注UAC以获取管理员权限):

/// <summary>/// The process-specific access rights./// </summary>[Flags]public enum ProcessAccess : uint{ /// <summary> /// required to terminate a process using TerminateProcess. /// </summary> Terminate = 0x1,/// <summary> /// required to create a thread. /// </summary> CreateThread = 0x2,/// <summary> /// Undocumented. /// </summary> SetSessionId = 0x4,/// <summary> /// required to perform an operation on the address space of a process (see VirtualProtectEx and WriteProcessMemory). /// </summary> VmOperation = 0x8,/// <summary> /// required to read memory in a process using ReadProcessMemory. /// </summary> VmRead = 0x10,/// <summary> /// required to write to memory in a process using WriteProcessMemory. /// </summary> VmWrite = 0x20,/// <summary> /// required to duplicate a handle using DuplicateHandle. /// </summary> DupHandle = 0x40,/// <summary> /// required to create a process. /// </summary> CreateProcess = 0x80,/// <summary> /// required to set memory limits using SetProcessWorkingSetSize. /// </summary> SetQuota = 0x100,/// <summary> /// required to set certain information about a process,such as its priority class (see SetPriorityClass). /// </summary> SetInformation = 0x200,/// <summary> /// required to retrieve certain information about a process,such as its token,exit code,and priority class (see OpenProcessToken,GetExitCodeProcess,GetPriorityClass,and IsProcessInJob). /// </summary> QueryInformation = 0x400,/// <summary> /// Undocumented. /// </summary> SetPort = 0x800,/// <summary> /// required to suspend or resume a process. /// </summary> SuspendResume = 0x800,/// <summary> /// required to retrieve certain information about a process (see QueryFullProcessImageName). A handle that has the PROCESS_QUERY_INFORMATION access right is automatically granted PROCESS_QUERY_LIMITED_INFORMATION. /// </summary> QueryLimitedInformation = 0x1000,/// <summary> /// required to wait for the process to terminate using the wait functions. /// </summary> Synchronize = 0x100000}[DllImport(“ntdll.dll”)]internal static extern uint NtResumeProcess([In] IntPtr processHandle);[DllImport(“ntdll.dll”)]internal static extern uint NtSuspendProcess([In] IntPtr processHandle);[DllImport(“kernel32.dll”,SetLastError = true)]internal static extern IntPtr OpenProcess( ProcessAccess desiredAccess,bool inheritHandle,int processId);[DllImport(“kernel32.dll”,SetLastError = true)][return: MarshalAs(UnmanagedType.Bool)]internal static extern bool CloseHandle([In] IntPtr handle);public static void SuspendProcess(int processId){ IntPtr hProc = IntPtr.Zero; try { // Gets the handle to the Process hProc = OpenProcess(ProcessAccess.SuspendResume,false,processId); if (hProc != IntPtr.Zero) { NtSuspendProcess(hProc); } } finally { // Don’t forget to close handle you created. if (hProc != IntPtr.Zero) { CloseHandle(hProc); } }}