How does -XX:+UseNUMA affects JVM performance for systems with only one node?

Question

There is a numerous articles regarding benefits of JVM NUMA-aware allocators. However I could not find information about what performance impact may cause -XX:+UseNUMA flag for

Answer 1

-XX:+UseNUMA does no harm in these cases.
HotSpot JVM automatically turns off the flag when run on a single node (the source).