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main.c
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77 lines (68 loc) · 1.86 KB
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#include "../rlibsc.h"
#include <fcntl.h>
#include <sched.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
// time interval for observing number of wakeups (in microseconds)
#define TIMER 1000 * 1000
#define TIMER_S (TIMER / (1000000))
#define TIMER_US (TIMER % (1000000))
struct itimerval timer = {
.it_interval = {.tv_sec = TIMER_S, .tv_usec = TIMER_US},
.it_value = {.tv_sec = TIMER_S, .tv_usec = TIMER_US}};
uint64_t lret = 0, lt = 0, lc = 0, cret = 0, ct = 0, cc = 0;
#define SW_L 5
size_t sw[SW_L];
int swp = 0;
void sigalarm(int num) {
cc = rdcycle();
ct = rdtime();
cret = rdinstret();
// printf("i: %zd - t: %zd - c: %zd\n", cret - lret, ct - lt, cc - lc);
// printf(" c/i: %.2f - t/i: %.2f\n", (float)(cc - lc) / (cret - lret),
// (float)(100000000) / (cret - lret));
// printf(" c/i: %.2f | c: %zd\n", (float)(cc - lc) / (cret - lret), cc -
// lc);
sw[swp] = cret - lret;
swp = (swp + 1) % SW_L;
ssize_t avg = 0;
for (int i = 0; i < SW_L; i++) {
avg += sw[i];
}
avg /= SW_L;
printf("ret: %zd\n", (cret - lret) - avg);
// if((cret - lret) - avg < (ssize_t)-6000000) printf("irq!\n");
lret = cret;
lt = ct;
lc = cc;
}
int main(int argc, char *argv[]) {
signal(SIGALRM, sigalarm);
setitimer(ITIMER_REAL, &timer, NULL);
while (1) {
sched_yield();
}
/*
cc = rdcycle();
ct = rdtime();
cret = rdinstret();
// printf("i: %zd - t: %zd - c: %zd\n", cret - lret, ct - lt, cc - lc);
// printf(" c/i: %.2f - t/i: %.2f\n", (float)(cc - lc) / (cret - lret),
(float)(100000000) / (cret - lret)); printf(" c/i: %.2f\n", (float)(cc - lc) /
(cret - lret));
lret = cret;
lt = ct;
lc = cc;
usleep(100000);
}
*/
return 0;
}