File creation statistics.
   * 
   * Each thread creates the same (+ or -1) number of files.
   * File names are pre-generated during initialization.
   * The created files do not have blocks.
File creation statistics.
   * 
   * Each thread creates the same (+ or -1) number of files.
   * File names are pre-generated during initialization.
   * The created files do not have blocks. | NNThroughputBenchmark.java