public void print() {
      long[] t = _t;
      System.out.print("["+t[0]);
      for( int i=1; i<t.length; i++ )
        System.out.print(","+t[i]);
      System.out.print("]");
      if( _next != null ) _next.print();
    }
Return the internal counter striping factor.  Useful for diagnosing
performance problems.
jctools-core/src/main/java/org/jctools/maps/ConcurrentAutoTable.java