Re: [SLE] What Processor?

On Tuesday 08 January 2002 21.17, Oliver Ob wrote:

It does so for Pentium and above processors only. So, as that one is a 486, my question remains.

If the question remains I'm assuming the other program mentioned didn't do it for you. Here's a little piece of c-code that I shamelessly swiped from dosemu's startup code. It determines my processor speed very accurately. In the original, the final line read ((b*4096)/a) instead of (b/a). that gave me a value that was 4096 times too high, so I removed it, but it may be that it's necessary on 486 CPUs. <code> #include #include #include int main(int argc, char *argv[]){ struct timeval tv1,tv2; u_int64_t a,b; gettimeofday(&tv1, NULL); __asm__ __volatile__ ("rdtsc" :"=a" (((unsigned long*)&a)[0]), "=d" (((unsigned long*)&a)[1])); /* for (j=0; j<10000000; j++);*/ /* 500ms on a P5-100 */ usleep(50000); gettimeofday(&tv2, NULL); __asm__ __volatile__ ("rdtsc" :"=a" (((unsigned long*)&b)[0]), "=d" (((unsigned long*)&b)[1])); b -= a; a = (tv2.tv_sec*1000000 + tv2.tv_usec) - (tv1.tv_sec*1000000 + tv1.tv_usec); printf("CPU speed is %d MHz\n", (int)(b/a)); return 0; } </code>