Mail Archives: cygwin/1998/04/29/06:28:54
On 24 Apr 98 at 17:47, Tein Horng Yuan wrote:
> Hi,
>
> I am running gnu-win32 B19-1 on a PII-233 system. Because I need to
> measure
> the CPU time, I find out 'clock' is not function correct. A test
> program is attached.
> Please send me email to tyuan AT beta DOT wsl DOT sinica DOT edu DOT tw
>
> By the way, will you have Pentium II optimization version of gcc?
> Thanks.
>
> -- Tein
Hello,
please use the GetTickCount() function of the Win32 API. It returns
the number of milliseconds that have elapsed since Windows was
started. I changed your program a little to include this
modification as well as eliminate gcc -Wall warnings.
Hope it is helpful,
--Hilton
---------------------------------------------------------------------
#include <windows.h> /* GetTickCount() */
#include <stdio.h>
#include <math.h>
typedef double REAL;
REAL second(void)
{ return ( ((REAL)GetTickCount ()) / ((REAL)1000.0) ); }
int main (void){ /* explicit main return type */
double a,b,c;
// long i,j,k,l,m,n,o,p; /* vars not used should be eliminated */ long
i, k,l;
c= 0;
b= second();
for(i=0; i<1024 * 1024 * 1024; i ++) {
for(k=0; k<1024 ; k ++)
for(l=0; l<1024 ; l ++)
a = sin(l) + cos(k);
c=b;
b=second();
// c= c - b;
c = b - c; // b is later than c
printf("%ld, %f, %f\n", i, b, c); /* i is long, use a long format */
}
return (0); /* to make gcc -Wall happy */
}
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