void set_load(const std::string& name, double power_w);
void set_load(const std::string& name, bool active);
void connect_host(s4u::Host* host, bool active = true);
void set_load(const std::string& name, double power_w);
void set_load(const std::string& name, bool active);
void connect_host(s4u::Host* host, bool active = true);