On Thu, Sep 10, 1998 at 11:45:15AM +1200, Chris Wedgwood wrote:
> The attached code on a PPro 200 gives me results of 2 usecs, using a
> P.II 300 and SYSENTER semantics, you can probably get this to less
> that 1usec.
Crap... here it is.
-cw
--MGYHOYXEY6WxJCY8
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment; filename="tv-test.c"
#include <sys/time.h>
#include <unistd.h>
#include <stdio.h>
int main()
{
struct timeval t1,t2,t3,t4;
do{
/* warm caches */
gettimeofday(&t1,NULL);
gettimeofday(&t2,NULL);
gettimeofday(&t3,NULL);
gettimeofday(&t4,NULL);
gettimeofday(&t3,NULL);
gettimeofday(&t4,NULL);
}while(t3.tv_sec != t4.tv_sec); /* yuk */
printf("%d usecs difference!\n",(int)(t4.tv_usec - t3.tv_usec));
return 0;
}
--MGYHOYXEY6WxJCY8--
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