34 lines
612 B
C
34 lines
612 B
C
|
#include <stdlib.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <time.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
static inline long rdcycle(void)
|
||
|
|
{
|
||
|
|
long cycle;
|
||
|
|
asm volatile ("csrr %[cycle], cycle" : [cycle] "=r" (cycle));
|
||
|
|
return cycle;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(void)
|
||
|
|
{
|
||
|
|
long cycles;
|
||
|
|
struct timespec ts1, ts2;
|
||
|
|
double nanos;
|
||
|
|
double cycles_per_nano;
|
||
|
|
|
||
|
|
clock_gettime(CLOCK_REALTIME, &ts1);
|
||
|
|
cycles = -rdcycle();
|
||
|
|
|
||
|
|
sleep(1);
|
||
|
|
|
||
|
|
clock_gettime(CLOCK_REALTIME, &ts2);
|
||
|
|
cycles += rdcycle();
|
||
|
|
|
||
|
|
nanos = (ts2.tv_sec - ts1.tv_sec) * 1e9 + (ts2.tv_nsec - ts1.tv_nsec);
|
||
|
|
cycles_per_nano = cycles / nanos;
|
||
|
|
|
||
|
|
printf("Clock speed: %f GHz\n", cycles_per_nano);
|
||
|
|
return 0;
|
||
|
|
}
|