private void usage() {
    System.err.println("Usage: " + this.getClass().getSimpleName() + " COMMAND [COMMAND options]");
    printCommands();
  }
A stand alone program that follows a linked list created by {@link Generator} and prints timing
info.
hbase-it/src/test/java/org/apache/hadoop/hbase/test/IntegrationTestBigLinkedList.java