Measuring cpu speed

[Everytime]

Can someone tell me if there is an api call that returns the cpu speed and what it is? thx.

[evileconomist]

Declare Function GetTickCount Lib "Kernel32" Alias "GetTickCount" () as Long

Is the simple way to do it, returns number of millisec since the OS booted.

[Everytime]

Not sure how knowing how long the current windows session has been running in milliseconds helps me get the MHtz speed of the cpu?

:confused:

[jim mcnamara]

Try this thread.

http://www.vbforums.com/showthread.php?s=&threadid=82385&highlight=cpu+speed

[evileconomist]

I missunderstood the question, mhz speed ok!

From GameDev forums I found the following C/C++ function
(it's the same as in jim's link)

uint32 GetCpuSpeed()
{
int timeStart = 0;
int timeStop = 0;
unsigned long StartTicks = 0;
unsigned long EndTicks = 0;
unsigned long TotalTicks = 0;
unsigned long cpuSpeed = 0;


timeStart = timeGetTime(); // Get tick edge
for( ; ; )
{
timeStop = timeGetTime();
if ( (timeStop-timeStart) > 1 ) // rollover past 1
{
__asm{
xor eax, eax
xor ebx, ebx
xor ecx, ecx
xor edx, edx
_emit 0x0f // CPUID
_emit 0xa2
_emit 0x0f // RTDSC
_emit 0x31
mov [StartTicks], eax // Tick counter starts here
}
break;
}
}

timeStart = timeStop;

for( ; ; )
{
timeStop = timeGetTime();
if ( (timeStop-timeStart) > 1000 ) // one second
{
__asm{
xor eax, eax
xor ebx, ebx
xor ecx, ecx
xor edx, edx
_emit 0x0f // CPUID
_emit 0xa2
_emit 0x0f // RDTSC
_emit 0x31
mov [EndTicks], eax }
break;
}
}

TotalTicks = EndTicks-StartTicks; // total

cpuSpeed = TotalTicks/1000000; // speed

return((uint32)cpuSpeed);
}



It's possible this file comes from AMD's site (I haven't verfied)