parser.accepts("db", "Database name").withRequiredArg();
parser.acceptsAll(asList("u", "user"), "DB username.").withRequiredArg();
parser.acceptsAll(asList("P", "password"), "DB password").withRequiredArg();
parser.acceptsAll(asList("p", "port"), "DB port").withRequiredArg();
parser.acceptsAll(asList("h", "host"), "DB host").withRequiredArg();
parser.accepts("requests").withRequiredArg().ofType(Integer.class);
parser.accepts("request-file").withRequiredArg();
parser.accepts("threads").withRequiredArg().ofType(Integer.class);
OptionSet options = parser.parse(args);
if(options.has("help")) {