如何编程得到和控制一个进程的cpu占用率？

Question

rt

Answer 1

...get the CPU usage in percent on Windows NT/2000/XP?  const 
  SystemBasicInformation = 0; 
  SystemPerformanceInformation = 2; 
  SystemTimeInformation = 3; type 
  TPDWord = ^DWORD;   TSystem_Basic_Information = packed record 
    dwUnknown1: DWORD; 
    uKeMaximumIncrement: ULONG; 
    uPageSize: ULONG; 
    uMmNumberOfPhysicalPages: ULONG; 
    uMmLowestPhysicalPage: ULONG; 
    uMmHighestPhysicalPage: ULONG; 
    uAllocationGranularity: ULONG; 
    pLowestUserAddress: Pointer; 
    pMmHighestUserAddress: Pointer; 
    uKeActiveProcessors: ULONG; 
    bKeNumberProcessors: byte; 
    bUnknown2: byte; 
    wUnknown3: word; 
  end; type 
  TSystem_Performance_Information = packed record 
    liIdleTime: LARGE_INTEGER; {LARGE_INTEGER} 
    dwSpare: array[0..75] of DWORD; 
  end; type 
  TSystem_Time_Information = packed record 
    liKeBootTime: LARGE_INTEGER; 
    liKeSystemTime: LARGE_INTEGER; 
    liExpTimeZoneBias: LARGE_INTEGER; 
    uCurrentTimeZoneId: ULONG; 
    dwReserved: DWORD; 
  end; var 
  NtQuerySystemInformation: function(infoClass: DWORD; 
    buffer: Pointer; 
    bufSize: DWORD; 
    returnSize: TPDword): DWORD; stdcall = nil; 
  liOldIdleTime: LARGE_INTEGER = (); 
  liOldSystemTime: LARGE_INTEGER = (); function Li2Double(x: LARGE_INTEGER): Double; 
begin 
  Result := x.HighPart * 4.294967296E9 + x.LowPart 
end; procedure GetCPUUsage; 
var 
  SysBaseInfo: TSystem_Basic_Information; 
  SysPerfInfo: TSystem_Performance_Information; 
  SysTimeInfo: TSystem_Time_Information; 
  status: Longint; {long} 
  dbSystemTime: Double; 
  dbIdleTime: Double;   bLoopAborted : boolean; begin 
  if @NtQuerySystemInformation = nil then 
    NtQuerySystemInformation := GetProcAddress(GetModuleHandle('ntdll.dll'), 
      'NtQuerySystemInformation');   // get number of processors in the system   status := NtQuerySystemInformation(SystemBasicInformation, @SysBaseInfo, SizeOf(SysBaseInfo), nil); 
  if status <> 0 then Exit;   // Show some information 
  with SysBaseInfo do 
  begin 
      ShowMessage( 
      Format('uKeMaximumIncrement: %d'#13'uPageSize: %d'#13+ 
      'uMmNumberOfPhysicalPages: %d'+#13+'uMmLowestPhysicalPage: %d'+#13+ 
      'uMmHighestPhysicalPage: %d'+#13+'uAllocationGranularity: %d'#13+ 
      'uKeActiveProcessors: %d'#13'bKeNumberProcessors: %d', 
      [uKeMaximumIncrement, uPageSize, uMmNumberOfPhysicalPages, 
      uMmLowestPhysicalPage, uMmHighestPhysicalPage, uAllocationGranularity, 
      uKeActiveProcessors, bKeNumberProcessors])); 
  end; 
  bLoopAborted := False;   while not bLoopAborted do 
  begin     // get new system time 
    status := NtQuerySystemInformation(SystemTimeInformation, @SysTimeInfo, SizeOf(SysTimeInfo), 0); 
    if status <> 0 then Exit;     // get new CPU's idle time 
    status := NtQuerySystemInformation(SystemPerformanceInformation, @SysPerfInfo, SizeOf(SysPerfInfo), nil); 
    if status <> 0 then Exit;     // if it's a first call - skip it 
    if (liOldIdleTime.QuadPart <> 0) then 
    begin       // CurrentValue = NewValue - OldValue 
      dbIdleTime := Li2Double(SysPerfInfo.liIdleTime) - Li2Double(liOldIdleTime); 
      dbSystemTime := Li2Double(SysTimeInfo.liKeSystemTime) - Li2Double(liOldSystemTime);       // CurrentCpuIdle = IdleTime / SystemTime 
      dbIdleTime := dbIdleTime / dbSystemTime;       // CurrentCpuUsage% = 100 - (CurrentCpuIdle * 100) / NumberOfProcessors 
      dbIdleTime := 100.0 - dbIdleTime * 100.0 / SysBaseInfo.bKeNumberProcessors + 0.5;       // Show Percentage 
      Form1.Label1.Caption := FormatFloat('CPU Usage: 0.0 %',dbIdleTime);       Application.ProcessMessages;       // Abort if user pressed ESC or Application is terminated 
      bLoopAborted := (GetKeyState(VK_ESCAPE) and 128 = 128) or Application.Terminated;     end;     // store new CPU's idle and system time 
    liOldIdleTime := SysPerfInfo.liIdleTime; 
    liOldSystemTime := SysTimeInfo.liKeSystemTime;     // wait one second 
    Sleep(1000); 
  end; 
end; 
procedure TForm1.Button1Click(Sender: TObject); 
begin 
  GetCPUUsage 
end; 

Answer 2

改了别人的程序，参考一下
unit Unit1;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;const 
  SystemBasicInformation = 0; 
  SystemPerformanceInformation = 2; 
  SystemTimeInformation = 3;type
  TPDWord = ^DWORD;   TSystem_Basic_Information = packed record 
    dwUnknown1: DWORD; 
    uKeMaximumIncrement: ULONG; 
    uPageSize: ULONG; 
    uMmNumberOfPhysicalPages: ULONG;
    uMmLowestPhysicalPage: ULONG; 
    uMmHighestPhysicalPage: ULONG;
    uAllocationGranularity: ULONG; 
    pLowestUserAddress: Pointer; 
    pMmHighestUserAddress: Pointer;
    uKeActiveProcessors: ULONG; 
    bKeNumberProcessors: byte;
    bUnknown2: byte; 
    wUnknown3: word; 
  end;
  TSystem_Performance_Information = packed record 
    liIdleTime: LARGE_INTEGER; {LARGE_INTEGER}
    dwSpare: array[0..75] of DWORD; 
  end;  TSystem_Time_Information = packed record 
    liKeBootTime: LARGE_INTEGER; 
    liKeSystemTime: LARGE_INTEGER; 
    liExpTimeZoneBias: LARGE_INTEGER;
    uCurrentTimeZoneId: ULONG; 
    dwReserved: DWORD; 
  end;
  TForm1 = class(TForm)
    Button1: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  Form1: TForm1;  NtQuerySystemInformation: function(infoClass: DWORD; 
    buffer: Pointer; 
    bufSize: DWORD;
    returnSize: TPDword): DWORD; stdcall = nil;  liOldIdleTime: LARGE_INTEGER = (); 
  liOldSystemTime: LARGE_INTEGER = ();implementation{$R *.dfm}function Li2Double(x: LARGE_INTEGER): Double; 
begin 
  Result := x.HighPart * 4.294967296E9 + x.LowPart 
end; procedure GetCPUUsage; 
var 
  SysBaseInfo: TSystem_Basic_Information; 
  SysPerfInfo: TSystem_Performance_Information; 
  SysTimeInfo: TSystem_Time_Information; 
  status: Longint; {long} 
  dbSystemTime: Double;
  dbIdleTime: Double;   bLoopAborted : boolean; begin 
  if @NtQuerySystemInformation = nil then 
    NtQuerySystemInformation := GetProcAddress(GetModuleHandle('ntdll.dll'),
      'NtQuerySystemInformation');  // get number of processors in the system   status := NtQuerySystemInformation(SystemBasicInformation, @SysBaseInfo, SizeOf(SysBaseInfo), nil); 
  if status <> 0 then Exit;   // Show some information 
  with SysBaseInfo do 
  begin 
      ShowMessage( 
      Format('uKeMaximumIncrement: %d'#13'uPageSize: %d'#13+ 
      'uMmNumberOfPhysicalPages: %d'+#13+'uMmLowestPhysicalPage: %d'+#13+ 
      'uMmHighestPhysicalPage: %d'+#13+'uAllocationGranularity: %d'#13+
      'uKeActiveProcessors: %d'#13'bKeNumberProcessors: %d', 
      [uKeMaximumIncrement, uPageSize, uMmNumberOfPhysicalPages, 
      uMmLowestPhysicalPage, uMmHighestPhysicalPage, uAllocationGranularity, 
      uKeActiveProcessors, bKeNumberProcessors])); 
  end; 
  bLoopAborted := False;   while not bLoopAborted do 
  begin     // get new system time 
    status := NtQuerySystemInformation(SystemTimeInformation, @SysTimeInfo, SizeOf(SysTimeInfo), 0);
    if status <> 0 then Exit;     // get new CPU's idle time 
    status := NtQuerySystemInformation(SystemPerformanceInformation, @SysPerfInfo, SizeOf(SysPerfInfo), nil); 
    if status <> 0 then Exit;     // if it's a first call - skip it
    if (liOldIdleTime.QuadPart <> 0) then 
    begin       // CurrentValue = NewValue - OldValue 
      dbIdleTime := Li2Double(SysPerfInfo.liIdleTime) - Li2Double(liOldIdleTime); 
      dbSystemTime := Li2Double(SysTimeInfo.liKeSystemTime) - Li2Double(liOldSystemTime);       // CurrentCpuIdle = IdleTime / SystemTime 
      dbIdleTime := dbIdleTime / dbSystemTime;       // CurrentCpuUsage% = 100 - (CurrentCpuIdle * 100) / NumberOfProcessors 
      dbIdleTime := 100.0 - dbIdleTime * 100.0 / SysBaseInfo.bKeNumberProcessors + 0.5;       // Show Percentage
      Form1.Label1.Caption := FormatFloat('CPU Usage: 0.0 %',dbIdleTime);      Application.ProcessMessages;      // Abort if user pressed ESC or Application is terminated
      bLoopAborted := (GetKeyState(VK_ESCAPE) and 128 = 128) or Application.Terminated;    end;    // store new CPU's idle and system time
    liOldIdleTime := SysPerfInfo.liIdleTime;
    liOldSystemTime := SysTimeInfo.liKeSystemTime;    // wait one second
    Sleep(1000);
  end;
end;procedure TForm1.Button1Click(Sender: TObject);
begin
  GetCPUUsage
end;end.

Answer 3

看到一些虚拟主机提供商说“cpu占用率10%”，是不是表明进程或者线程的cpu占用率可以设置？

Answer 4

可以的, 你查查網上關于 win job 的討論!!!