private static int hash() {
    //int h = (int)Thread.currentThread().getId();
    int h = System.identityHashCode(Thread.currentThread());
    return h<<3;                // Pad out cache lines.  The goal is to avoid cache-line contention
  }
Return the internal counter striping factor.  Useful for diagnosing
performance problems.
jctools-core/src/main/java/org/jctools/maps/ConcurrentAutoTable.java