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waste prints memory bandwidth

albatross
Comma Device 2020-11-20 22:53:37 +00:00
parent 85c9a71bc9
commit d341fe0240
1 changed files with 13 additions and 8 deletions
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21
scripts/waste.c
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@ -3,6 +3,7 @@
#define _GNU_SOURCE
#include <stdio.h>
#include <math.h>
#include <sched.h>
#include <stdlib.h>
#include <unistd.h>
@ -11,6 +12,7 @@
#include <sys/sysinfo.h>
#include "../selfdrive/common/timing.h"
int get_nprocs(void);
double *ttime, *oout;
void waste(int pid) {
@ -21,12 +23,12 @@ void waste(int pid) {
printf("set affinity to %d: %d\n", pid, ret);
// 256 MB
float32x4_t *tmp = (float32x4_t *)malloc(0x1000001*sizeof(float32x4_t));
float32x4_t *tmp = (float32x4_t *)malloc(0x1000000*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, 0x1000001*sizeof(float32x4_t));
memset(tmp, 0xaa, 0x1000000*sizeof(float32x4_t));
#endif
float32x4_t out;
@ -34,7 +36,7 @@ void waste(int pid) {
double sec = seconds_since_boot();
while (1) {
for (int i = 0; i < 8; i++) {
for (int j = 0; j < 0x1000000; j++) {
for (int j = 0; j < 0x1000000; j+=2) {
out = vmlaq_f32(out, tmp[j], tmp[j+1]);
}
}
@ -51,16 +53,19 @@ int main() {
oout = (double *)malloc(CORES*sizeof(double));
pthread_t waster[CORES];
for (int i = 0 ; i < CORES; i++) {
pthread_create(&waster[i], NULL, waste, (void*)i);
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;
for (int i = 0 ; i < CORES; i++) {
for (int i = 0; i < CORES; i++) {
avg += ttime[i];
printf("%.2f ", ttime[i]);
printf("%4.2f ", ttime[i]);
}
printf("-- %.2f\n", avg/CORES);
avg /= CORES;
double mb_per_sec = (8.*0x1000000/(1024*1024))*sizeof(float32x4_t)*CORES*(1/avg);
printf("-- %4.2f -- %.2f MB/s \n", avg, mb_per_sec);
sleep(1);
}
}