title: How does -XX:+UseNUMA affects JVM performance for systems with only one node?
body: <p>There is a numerous articles regarding benefits of JVM NUMA-aware allocators.  However I could not find information about what performance impact may cause <a href="http://docs.oracle.com/javase/7/docs/technotes/guides/vm/performance-enhancements-7.html#numa" rel="noreferrer"><code>-XX:+UseNUMA</code></a> flag for single-node topologies like</p>
  
  <pre><code># numactl --hardware
  available: 1 nodes (0)
  node 0 cpus: 0 1 2 3
  node 0 size: 32060 MB
  node 0 free: 7770 MB
  node distances:
  node   0 
    0:  10
  </code></pre>
  
  <p>It seems that this is a kind of corner case and there is no real profit in enabling flag. If so is there any drawbacks may be caused by enabling it?</p>