//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;

{ **** UBPFD *********** by delphibase.endimus.com ****
>> Показывает загруженость процессора
Показывает загруженость процессора
Зависимости: registry,Windows, SysUtils, Forms,Gauges,
  Classes, Controls, ExtCtrls, StdCtrls;
Автор: DDA, Vologda
Copyright: Где-то найдено
Дата: 11 февраля 2004 г.
***************************************************** }
unit Unit1;
interface
uses
 registry, Windows, SysUtils, Forms, Gauges, Classes, Controls, ExtCtrls,
  StdCtrls;
type
 TForm1 = class(TForm)
  Gauge1: TGauge;
  Timer1: TTimer;
  Button1: TButton;
  procedure Button1Click(Sender: TObject);
  procedure Timer1Timer(Sender: TObject);
 private
  { Private declarations }
 public
  { Public declarations }
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var
 def: string;
 reg: TRegistry;
 Buffer: array[0..1000] of integer;
begin
 //-------------------------------
 reg := TRegistry.Create;
 reg.RootKey := HKEY_DYN_DATA;
 def := '';
 if reg.OpenKey('PerfStats\StartStat', false) = TRUE then
 begin
  reg.ReadBinaryData('KERNEL\CPUusage', buffer, 1000);
 end;
 reg.CloseKey;
 Timer1.Enabled := true;
end;
//-------------------------------
procedure TForm1.Timer1Timer(Sender: TObject);
var
 def: string;
 reg: TRegistry;
 B: array[1..4] of integer;
begin
 reg := TRegistry.Create;
 reg.RootKey := HKEY_DYN_DATA;
 def := '';
 if reg.OpenKey('PerfStats\StatData', false) = TRUE then
 begin
  reg.ReadBinaryData('KERNEL\CPUusage', b, 4);
 end;
 reg.CloseKey;
 Gauge1.Progress := b[1];
 Application.ProcessMessages;
 //-------------------------------
end;
end.