Определение частоты процессора

Written on 01 Ноября 2007. Posted in [Delphi] Система. Железо

//
// Determinate CPU Freq
//
//

function GetCPUSpeed: Double;
const

DelayTime = 500;

var

TimerHi : DWORD;

TimerLo : DWORD;

PriorityClass : Integer;

Priority : Integer;

begin

PriorityClass := GetPriorityClass(GetCurrentProcess);

Priority := GetThreadPriority(GetCurrentThread);

SetPriorityClass(GetCurrentProcess, REALTIME_PRIORITY_CLASS);

SetThreadPriority(GetCurrentThread, THREAD_PRIORITY_TIME_CRITICAL);

Sleep(10);

asm

DW 310Fh // rdtsc

MOV TimerLo, EAX

MOV TimerHi, EDX

end;

Sleep(DelayTime);

asm

DW 310Fh // rdtsc

SUB EAX, TimerLo

SBB EDX, TimerHi

MOV TimerLo, EAX

MOV TimerHi, EDX

end;

SetPriorityClass(GetCurrentProcess, PriorityClass);

Result := TimerLo / (1000.0 * DelayTime);

end;

// Usage ...

LabelCPUSpeed.Caption := Format('CPU speed: %f MHz', [GetCPUSpeed]);