System Performance and Cost Modelling in LHC computing Catherine Biscarat, Tommaso Boccali, Daniele Bonacorsi, Concezio Bozzi, Davide Costanzo, Dirk Duellmann, Johannes Elmsheuser, Eric Fede, José Flix Molina, Domenico Giordano et al. (18 more) EPJ Web Conf., 214 (2019) 03019 Published online: 17 September 2019 DOI: 10.1051/epjconf/201921403019