Message-ID:	<3B637F55.B6DF0FD2@hotmail.nospam.com>
From:	Ian Rees <ianr44 AT hotmail DOT nospam DOT com>
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Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Cpu speed detection using DJGPP?
References:	<68C4CF842BD2D411AC1600902740B6DA02CDC45E AT mcoexc02 DOT mlm DOT maxtor DOT com> <458df9bf DOT 0107242347 DOT 5725a1a0 AT posting DOT google DOT com>
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Date:	Sat, 28 Jul 2001 23:13:25 -0400
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To:	djgpp AT delorie DOT com
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Seems to work on my computer, too.  I have a 1Ghz. Athlon Processor
running Win98se and it shows 1000+/- about 3 Mhz .  I modified the
program a little to make it average 100 results and it averages at
1000Mhz, exactly where it sould be.


-Ian-

Daniel Friberg wrote:

> Thanks for all the replies! This is what I came up with and it seems
> too work fine on my K6-2 computers.
>
> #include <stdio.h>
> #include <time.h>
>
> int main()
> {
>   unsigned long val1, val2,speed;
>   unsigned long tm1,tm2,i ;
>   double time;
>
>   tm1 = uclock();
>   asm
>   (
>                 "rdtsc\n
>                  movl %%eax, %0"
>                 : "=g" (val1)
>                 : /* no inputs */
>                 : "ax", "dx"
>   );
>   for(i=0;i<100000;i++);
>   tm2 = uclock();
>   asm
>   (
>                 "rdtsc\n
>                  movl %%eax, %0"
>                 : "=g" (val2)
>                 : /* no inputs */
>                 : "ax", "dx"
>   );
>
>   time = (double) (tm2 - tm1) / UCLOCKS_PER_SEC;
>   speed = (val2-val1)/time/1000000;
>
>   printf("Time elapsed: %f seconds.\n",time);
>   printf("Cycles executed: %d.\n",val2-val1);
>   printf("Calculated speed: %dMHz.\n",speed);
>
>   return 0;
> }
>
> //Daniel

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