public SimBase(SimConfig conf) throws IOException {
SimEngine engine = new SimEngineImpl(conf.getSub("engine", "engine"));
SimRegistry registry = new SimRegistry();
registry.add("ping", new Ping());
registry.add("info", new Info());
registry.add("save", new Save());
registry.add("load", new Load());
registry.add("del", new Del());
registry.add("bsave", new BSave());