System Performance and Cost Modelling in LHC computing

• Main Authors: Biscarat Catherine, Boccali Tommaso, Bonacorsi Daniele, Bozzi Concezio, Costanzo Davide, Duellmann Dirk, Elmsheuser Johannes, Fede Eric, Flix Molina José, Giordano Domenico, Grigoras Costin, Iven Jan, Jouvin Michel, Kemp Yves, Lange David, Meinhard Helge, Michelotto Michele, Douglas Roy Gareth, Sansum Andrew, Sartirana Andrea, Schulz Markus, Sciabà Andrea, Smirnova Oxana, Stewart Graeme, Valassi Andrea, Vernet Renaud, Wenaus Torre, Wuerthwein Frank
• Format: Article
• Language: English
• Published: EDP Sciences 2019-01-01
• Series: EPJ Web of Conferences
• Online Access: https://www.epj-conferences.org/articles/epjconf/pdf/2019/19/epjconf_chep2018_03019.pdf

The increase in the scale of LHC computing expected for Run 3 and even more so for Run 4 (HL-LHC) over the next ten years will certainly require radical changes to the computing models and the data processing of the LHC experiments. Translating the requirements of the physics programmes into computing resource needs is a complicated process and subject to significant uncertainties. For this reason, WLCG has established a working group to develop methodologies and tools intended tocharacterise the LHC workloads, better understand their interaction with the computing infrastructure, calculate their cost in terms of resources and expenditure and assist experiments, sites and the WLCG project in the evaluation of their future choices. This working group started in November 2017 and has about 30 active participants representing experiments and sites. In this contribution we expose the activities, the results achieved and the future directions.