Add CPU affinity

clock-res/src/clockres.c

@@ -46,17 +46,24 @@ static inline uint64_t min(uint64_t a, uint64_t b);
 static void *timerthread(void *p) {
   struct timespec previous, current;
   struct sched_param priority;
+  cpu_set_t mask;
   uint64_t diff;
   char time_measured_string[255];
 
   thread_param_t *param = (thread_param_t *)p;
   thread_stat_t *stat = &param->stat;
 
+  // Set thread priority
   priority.sched_priority = param->priority;
-
   if (sched_setscheduler(0, SCHED_FIFO, &priority))
     error(EXIT_FAILURE, errno, "Couldn't set priority");
 
+  // Set thread CPU affinity
+  CPU_ZERO(&mask);
+  CPU_SET(1, &mask);
+  if (pthread_setaffinity_np(0, sizeof(mask), &mask) == -1)
+    printf("Could not set CPU affinity to CPU #1\n");
+
   stat->max_res = 0;
   stat->min_res = UINT64_MAX;
 
@@ -71,7 +78,6 @@ static void *timerthread(void *p) {
     diff = calcdiff_ns(current, previous);
 
     if (param->enable_tracing && (diff > param->latency_threshold)) {
-
       sprintf(time_measured_string, "Diff measured: %" PRIu64 "\n", diff);
       tracemark(time_measured_string);
       tracing(0);