There is no set of parameters for which all simulations would find the global minimum. This is caused by the fact that for these large clusters, the configurational space is very complex. The simulations get stuck in a tree branch of all energy minima if not diverse enough (i.e. small SN ) and require significantly longer times to escape (i.e. large gen), or vice versa, for diverse ensemble (i.e. large SN ), the simulations were too short (i.e. small gen)