1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
/*
* tmfunc.c
* Test timing function on different platforms
*
* by Nan Dun <dun@logos.ic.i.u-tokyo.ac.jp>
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/time.h>
static inline uint64_t rdtsc()
{
#if defined __i386__ || defined __x86_64__
uint32_t hi, lo;
asm volatile("lfence\nrdtsc\n" : "=a"(lo),"=d"(hi));
return ((uint64_t)hi)<<32 | lo;
#elif __sparc__
uint64_t tick;
asm volatile("rd %%tick, %0" : "=r" (tick));
return tick;
#else
#error "get_rdtsc() not implemented"
return 0;
#endif
}
int main(int argc, char **argv)
{
uint64_t t0, t1;
int secs, i;
if (argc < 2) {
printf("usage: %s SECS\n", argv[0]);
exit(0);
}
secs = atoi(argv[1]);
t0 = t1 = 0;
t0 = rdtsc();
// for (i = 0; i < 10000000; i++)
// secs += i;
sleep(1);
t1 = rdtsc();
printf("ticks:%lu (%lu-%lu)\n", t1-t0, t1, t0);
printf("%u\n", secs);
exit(0);
}
|
