bring over scripts

old-commit-hash: d4d57ed7fe

scripts/waste.c

@@ -0,0 +1,52 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <sched.h>
+#include <arm_neon.h>
+#include "../selfdrive/common/timing.h"
+
+#define CORES 4
+double ttime[CORES];
+double oout[CORES];
+
+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);
+
+  float32x4_t *tmp = (float32x4_t *)malloc(0x1000008*sizeof(float32x4_t));
+  float32x4_t out;
+
+  uint64_t i = 0;
+  double sec = seconds_since_boot();
+  while(1) {
+    int j;
+    for (j = 0; j < 0x1000000; j++) {
+      out = vmlaq_f32(out, tmp[j], tmp[j+1]);
+    }
+    if (i == 0x8) {
+      double nsec = seconds_since_boot();
+      ttime[pid] = nsec-sec;
+      oout[pid] = out[0] + out[1] + out[2] + out[3];
+      i = 0;
+      sec = nsec;
+    }
+    i++;
+  }
+}
+
+int main() {
+  pthread_t waster[CORES];
+  for (int i = 0 ; i < CORES; i++) {
+    pthread_create(&waster[i], NULL, waste, (void*)i);
+  }
+  while (1) {
+    for (int i = 0 ; i < CORES; i++) {
+      printf("%.2f ", ttime[i]);
+    }
+    printf("\n");
+    sleep(1);
+  }
+}
+