_SC_NPROCESSORS_CONF

userland/linux/mmap_anonymous.c

@@ -25,8 +25,7 @@ int main(int argc, char **argv) {
     chars = mmap(
         NULL,
         nbytes,
-        PROT_READ | PROT_WRITE,
-        MAP_SHARED | MAP_ANONYMOUS,
+        PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS,
         -1,
         0
     );

userland/linux/sysconf.c

@@ -9,5 +9,7 @@ int main(void) {
     /* Number of processors, not considering affinity:
      * http://stackoverflow.com/questions/2693948/how-do-i-retrieve-the-number-of-processors-on-c-linux */
     printf("_SC_NPROCESSORS_ONLN = %ld\n", sysconf(_SC_NPROCESSORS_ONLN));
+    /* CPUs configured by OS during boog. Some may have gone offline, so could be larger than _SC_NPROCESSORS_ONLN.a */
+    printf("_SC_NPROCESSORS_CONF = %ld\n", sysconf(_SC_NPROCESSORS_CONF));
     return EXIT_SUCCESS;
 }