90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
// gcc -O2 waste.c -lpthread -owaste
|
|
// gcc -O2 waste.c -lpthread -owaste -DMEM
|
|
|
|
#define _GNU_SOURCE
|
|
#include <stdio.h>
|
|
#include <math.h>
|
|
#include <sched.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <pthread.h>
|
|
#include <arm_neon.h>
|
|
#include <sys/sysinfo.h>
|
|
#include "../selfdrive/common/timing.h"
|
|
|
|
int get_nprocs(void);
|
|
double *ttime, *oout;
|
|
|
|
void waste(int pid) {
|
|
cpu_set_t my_set;
|
|
CPU_ZERO(&my_set);
|
|
CPU_SET(pid, &my_set);
|
|
int ret = sched_setaffinity(0, sizeof(cpu_set_t), &my_set);
|
|
printf("set affinity to %d: %d\n", pid, ret);
|
|
|
|
// 128 MB
|
|
float32x4_t *tmp = (float32x4_t *)malloc(0x800000*sizeof(float32x4_t));
|
|
|
|
// comment out the memset for CPU only and not RAM
|
|
// otherwise we need this to avoid the zero page
|
|
#ifdef MEM
|
|
memset(tmp, 0xaa, 0x800000*sizeof(float32x4_t));
|
|
#endif
|
|
|
|
float32x4_t out;
|
|
|
|
double sec = seconds_since_boot();
|
|
while (1) {
|
|
for (int i = 0; i < 0x10; i++) {
|
|
for (int j = 0; j < 0x800000; j+=0x20) {
|
|
out = vmlaq_f32(out, tmp[j+0], tmp[j+1]);
|
|
out = vmlaq_f32(out, tmp[j+2], tmp[j+3]);
|
|
out = vmlaq_f32(out, tmp[j+4], tmp[j+5]);
|
|
out = vmlaq_f32(out, tmp[j+6], tmp[j+7]);
|
|
out = vmlaq_f32(out, tmp[j+8], tmp[j+9]);
|
|
out = vmlaq_f32(out, tmp[j+10], tmp[j+11]);
|
|
out = vmlaq_f32(out, tmp[j+12], tmp[j+13]);
|
|
out = vmlaq_f32(out, tmp[j+14], tmp[j+15]);
|
|
out = vmlaq_f32(out, tmp[j+16], tmp[j+17]);
|
|
out = vmlaq_f32(out, tmp[j+18], tmp[j+19]);
|
|
out = vmlaq_f32(out, tmp[j+20], tmp[j+21]);
|
|
out = vmlaq_f32(out, tmp[j+22], tmp[j+23]);
|
|
out = vmlaq_f32(out, tmp[j+24], tmp[j+25]);
|
|
out = vmlaq_f32(out, tmp[j+26], tmp[j+27]);
|
|
out = vmlaq_f32(out, tmp[j+28], tmp[j+29]);
|
|
out = vmlaq_f32(out, tmp[j+30], tmp[j+31]);
|
|
}
|
|
}
|
|
double nsec = seconds_since_boot();
|
|
ttime[pid] = nsec-sec;
|
|
oout[pid] = out[0] + out[1] + out[2] + out[3];
|
|
sec = nsec;
|
|
}
|
|
}
|
|
|
|
int main() {
|
|
int CORES = get_nprocs();
|
|
ttime = (double *)malloc(CORES*sizeof(double));
|
|
oout = (double *)malloc(CORES*sizeof(double));
|
|
|
|
pthread_t waster[CORES];
|
|
for (long i = 0; i < CORES; i++) {
|
|
ttime[i] = NAN;
|
|
pthread_create(&waster[i], NULL, (void *(*)(void *))waste, (void*)i);
|
|
}
|
|
while (1) {
|
|
double avg = 0.0;
|
|
double iavg = 0.0;
|
|
for (int i = 0; i < CORES; i++) {
|
|
avg += ttime[i];
|
|
iavg += 1/ttime[i];
|
|
printf("%4.2f ", ttime[i]);
|
|
}
|
|
double mb_per_sec = (16.*0x800000/(1024*1024))*sizeof(float32x4_t)*iavg;
|
|
printf("-- %4.2f -- %.2f MB/s \n", avg/CORES, mb_per_sec);
|
|
sleep(1);
|
|
}
|
|
}
|
|
|