CERN Accelerating science

Article
Title	Integration of the Barcelona Supercomputing Center for CMS computing: Towards large scale production
Author(s)	Acosta-Silva, C (PIC, Bellaterra ; Barcelona, IFAE) ; Peris, A Delgado (Madrid, CIEMAT) ; Molina, J Flix (PIC, Bellaterra ; Madrid, CIEMAT) ; Hernández, J M (Madrid, CIEMAT) ; Yzquierdo, A Pérez-Calero (PIC, Bellaterra ; Madrid, CIEMAT) ; Sánchez, E Pineda (Barcelona, Autonoma U.) ; Domínguez, I Villalonga (Barcelona, Autonoma U.)
Collaboration	CMS Collaboration
Publication	2024
Number of pages	8
In:	EPJ Web Conf. 295 (2024) 07027
In:	26th International Conference on Computing in High Energy & Nuclear Physics, Norfolk, Virginia, Us, 8 - 12 May 2023, pp.07027
DOI	10.1051/epjconf/202429507027
Subject category	Computing and Computers
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	The CMS experiment is working to integrate an increasing number of High Performance Computing (HPC) resources into its distributed computing infrastructure. The case of the Barcelona Supercomputing Center (BSC) is particularly challenging as severe network restrictions prevent the use of CMS standard computing solutions. The CIEMAT CMS group has performed significant work in order to overcome these constraints and make BSC resources available to CMS. The developments include adapting the workload management tools, replicating the CMS software repository to BSC storage, providing an alternative access to detector conditions data, and setting up a service to transfer produced output data to a nearby storage facility. In this work, we discuss the current status of this integration activity and present recent developments, such as a front-end service to improve slot usage efficiency and an enhanced transfer service that supports the staging of input data for workflows at BSC. Moreover, significant efforts have been devoted to improving the scalability of the deployed solution, automating its operation, and simplifying the matchmaking of CMS workflows that are suitable for execution at BSC.
Copyright/License	publication: © 2024 The authors (License: CC-BY-4.0)

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