Funky scheduler yield thing experiment

sched_yield.c

@@ -0,0 +1,36 @@
+#include <sched.h>
+#include <stdio.h>
+#include <time.h>
+
+struct timespec ts = {.tv_nsec = 30, .tv_sec = 0};
+volatile int dummy = 0;
+
+int main(int argc, char *argv[]) {
+    struct timespec start, end;
+
+    clock_gettime(CLOCK_MONOTONIC, &start);
+
+    for (int a = 0; a < 10000; a++) {
+        // Keep in mind that yield is a syscall, it does not sleep, but places
+        // the process at the end of the run queue and gives other threads a
+        // chance to run.
+        sched_yield();
+        dummy++; // Do some stuff to the dummy to avoid optimizations
+
+        nanosleep(&ts, NULL);
+
+        printf("Iteration %d\n", a);
+        fflush(stdout);
+    }
+
+    clock_gettime(CLOCK_MONOTONIC, &end);
+
+    long sec = end.tv_sec - start.tv_sec;
+    long nanos = end.tv_nsec - start.tv_nsec;
+
+    double elapsed = sec + nanos * 1e-9;
+
+    printf("Elapsed time: %.2fs\n", elapsed);
+
+    return 0;
+}