A. Pérez-Calero Yzquierdo

Analysis Facilities for the HL-LHC White Paper Open

D. Ciangottini, A. C. Forti, L. Heinrich, N. Skidmore, C. Alpigiani , et al. · 2025

This white paper presents the current status of the R&D for Analysis Facilities (AFs) and attempts to summarize the views on the future direction of these facilities. These views have been collected through the High Energy Physics (HEP) So…

Operational experience from the Spanish CMS Analysis Facility at CIEMAT Open

M. Cárdenas-Montes, Juan Vicente Delgado Bermejo, A. Delgado Peris, J. Flix, J. M. Hernández , et al. · 2025

The anticipated surge in data volumes generated by the LHC in the coming years, especially during the High-Luminosity LHC phase, will reshape how physicists conduct their analysis. This necessitates a shift in programming paradigms and tec…

Commissioning and exploitation of the MareNostrum5 cluster at the Barcelona Supercomputing Center for CMS computing Open

A. Delgado Peris, J. Flix, J. M. Hernández, A. Pérez-Calero Yzquierdo · 2025

The MareNostrum 5 (MN5) is the newly deployed pre-exascale EuroHPC supercomputer hosted at the Barcelona Supercomputing Center (BSC) in Spain. Its 750,000-core general-purpose CPU cluster offers new opportunities for CMS data processing an…

Exploiting GPU Resources at VEGA for CMS Software Validation Open

D. Spiga, Adriano Di Florio, Andrea Bocci, A. Pérez-Calero Yzquierdo, Christoph Wissing , et al. · 2025

In recent years, the CMS experiment has expanded the usage of HPC systems for data processing and simulation activities. These resources significantly extend the conventional pledged Grid compute capacity. Within the EuroHPC program, CMS a…

Optimization of distributed compute resources utilization in the CMS Global Pool Open

Marco Mascheroni, A. Pérez-Calero Yzquierdo, Hyunwoo Kim, Florian Von Cube, Vaiva Zokaite , et al. · 2025

The CMS Submission Infrastructure is the primary system for managing computing resources for CMS workflows, including data processing, simulation, and analysis. It integrates geographically distributed resources from Grid, HPC, and cloud p…

Analysis Facilities White Paper Open

D. Ciangottini, A. Forti, L. Heinrich, N. Skidmore, C. Alpigiani , et al. · 2024

This white paper presents the current status of the R&D for Analysis Facilities (AFs) and attempts to summarize the views on the future direction of these facilities. These views have been collected through the High Energy Physics (HEP) So…

Adoption of a token-based authentication model for the CMS Submission Infrastructure Open

A. Pérez-Calero Yzquierdo, Marco Mascheroni, Edita Kizinevič, Farrukh Aftab Khan, Hyunwoo Kim , et al. · 2024

The CMS Submission Infrastructure (SI) is the main computing resource provisioning system for CMS workloads. A number of HTCondor pools are employed to manage this infrastructure, which aggregates geographically distributed resources from …

Repurposing of the Run 2 CMS High Level Trigger Infrastructure as a Cloud Resource for Offline Computing Open

Marco Mascheroni, A. Pérez-Calero Yzquierdo, Edita Kizinevič, Farrukh Aftab Khan, Hyunwoo Kim , et al. · 2024

The former CMS Run 2 High Level Trigger (HLT) farm is one of the largest contributors to CMS compute resources, providing about 25k job slots for offline computing. This CPU farm was initially employed as an opportunistic resource, exploit…

HPC resources for CMS offline computing: An integration and scalability challenge for the Submission Infrastructure Open

A. Pérez-Calero Yzquierdo, Marco Mascheroni, Edita Kizinevič, Farrukh Aftab Khan, Hyunwoo Kim , et al. · 2024

The computing resource needs of LHC experiments are expected to continue growing significantly during the Run 3 and into the HL-LHC era. The landscape of available resources will also evolve, as High Performance Computing (HPC) and Cloud r…

A case study of content delivery networks for the CMS ex-periment Open

Carles Acosta‐Silva, J. Casals, A. Delgado Peris, J. Flix, J. M. Hernández , et al. · 2024

In 2029 the LHC will start the high-luminosity LHC program, with a boost in the integrated luminosity resulting in an unprecedented amount of ex- perimental and simulated data samples to be transferred, processed and stored in disk and tap…

Integration of the Barcelona Supercomputing Center for CMS computing: Towards large scale production Open

Carles Acosta‐Silva, A. Delgado Peris, J. Flix, J. M. Hernández, A. Pérez-Calero Yzquierdo , et al. · 2024

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 …

The integration of heterogeneous resources in the CMS Submission Infrastructure for the LHC Run 3 and beyond Open

A. Pérez-Calero Yzquierdo, Marco Mascheroni, Edita Kizinevič, Farrukh Aftab Khan, Hyunwoo Kim , et al. · 2024

While the computing landscape supporting LHC experiments is currently dominated by x86 processors at WLCG sites, this configuration will evolve in the coming years. LHC collaborations will be increasingly employing HPC and Cloud facilities…

The Spanish CMS Analysis Facility at CIEMAT Open

M. Cárdenas-Montes, A. Delgado Peris, J. Flix, J. M. Hernández, J. León Holgado , et al. · 2024

The increasingly larger data volumes that the LHC experiments will accumulate in the coming years, especially in the High-Luminosity LHC era, call for a paradigm shift in the way experimental datasets are accessed and analyzed. The current…

Extending the distributed computing infrastructure of the CMS experiment with HPC resources Open

Jennifer Adelman-McCarthy, T. Boccali, René Caspart, A. Delgado Peris, Max Fischer , et al. · 2023

Particle accelerators are an important tool to study the fundamental properties of elementary particles. Currently the highest energy accelerator is the LHC at CERN, in Geneva, Switzerland. Each of its four major detectors, such as the CMS…

HSF IRIS-HEP Second Analysis Ecosystem Workshop Report Open

G. A. Stewart, P. Elmer, G. Eulisse, L. Gouskos, Stephan Hageboeck , et al. · 2022

The second workshop on the HEP Analysis Ecosystem took place 23-25 May 2022 at IJCLab in Orsay, to look at progress and continuing challenges in scaling up HEP analysis to meet the needs of HL-LHC and DUNE, as well as the very pressing nee…

HSF IRIS-HEP Second Analysis Ecosystem Workshop Report Open

G. A. Stewart, P. Elmer, G. Eulisse, L. Gouskos, Stephan Hageboeck , et al. · 2022

The second workshop on the HEP Analysis Ecosystem took place 23-25 May 2022 at IJCLab in Orsay, to look at progress and continuing challenges in scaling up HEP analysis to meet the needs of HL-LHC and DUNE, as well as the very pressing nee…

Resource provisioning and workload scheduling of CMS Offline Computing Open

A. Pérez-Calero Yzquierdo · 2021

The CMS experiment requires vast amounts of computational capacity in order to generate, process and analyze the data coming from proton-proton collisions at the Large Hadron Collider, as well as Monte Carlo simulations. CMS computing need…

Reaching new peaks for the future of the CMS HTCondor Global Pool Open

A. Pérez-Calero Yzquierdo, M Mascheroni, Maria Acosta Flechas, J M Dost, Saqib Haleem , et al. · 2021

The CMS experiment at CERN employs a distributed computing infrastructure to satisfy its data processing and simulation needs. The CMS Submission Infrastructure team manages a dynamic HTCondor pool, aggregating mainly Grid clusters worldwi…

Exploitation of network-segregated CPU resources in CMS Open

Carles Acosta‐Silva, A. Delgado Peris, J. Flix, Jeremy G. Frey, J. M. Hernández , et al. · 2021

CMS is tackling the exploitation of CPU resources at HPC centers where compute nodes do not have network connectivity to the Internet. Pilot agents and payload jobs need to interact with external services from the compute nodes: access to …

Lightweight site federation for CMS support Open

Carles Acosta‐Silva, A. Delgado Peris, J. Flix, Jeannie Ma. Guerrero, J. M. Hernández , et al. · 2020

There is a general trend in WLCG towards the federation of resources, aiming for increased simplicity, efficiency, flexibility, and availability. Although general VO-agnostic federation of resources between two independent and autonomous r…

CMS data access and usage studies at PIC Tier-1 and CIEMAT Tier-2 Open

A. Delgado Peris, J. Flix, J. M. Hernández, A. Pérez-Calero Yzquierdo, C. Pérez Dengra , et al. · 2020

The current computing models from LHC experiments indicate that much larger resource increases would be required by the HL-LHC era (2026+) than those that technology evolution at a constant budget could bring. Since worldwide budget for co…

Evolution of the CMS Global Submission Infrastructure for the HL-LHC Era Open

A. Pérez-Calero Yzquierdo, Maria Acosta Flechas, Diego Davila Foyo, Saqib Haleem, K. Hurtado Anampa , et al. · 2020

Efforts in distributed computing of the CMS experiment at the LHC at CERN are now focusing on the functionality required to fulfill the projected needs for the HL-LHC era. Cloud and HPC resources are expected to be dominant relative to res…

Exploiting network restricted compute resources with HTCondor: a CMS experiment experience Open

Carles Acosta‐Silva, A. Delgado Peris, J. Flix, Jaime Frey, J. M. Hernández , et al. · 2020

In view of the increasing computing needs for the HL-LHC era, the LHC experiments are exploring new ways to access, integrate and use non-Grid compute resources. Accessing and making efficient use of Cloud and High Performance Computing (H…

CMS strategy for HPC resource exploitation Open

A. Pérez-Calero Yzquierdo · 2020

High Energy Physics (HEP) experiments will enter a new era with the start of the HL-LHC program, with computing needs surpassing by large factors the current capacities. Anticipating such scenario, funding agencies from participating count…

Exploiting CRIC to streamline the configuration management of GlideinWMS factories for CMS support Open

J M Dost, Marco Mascheroni, Julia Andreeva, A. V. Anisenkov, Dennis Box , et al. · 2020

GlideinWMS is a workload management and provisioning system that allows sharing computing resources distributed over independent sites. Based on the requests made by GlideinWMS frontends, a dynamically sized pool of resources is created by…

Improving efficiency of analysis jobs in CMS Open

T. Ivanov, S. Belforte, M. Wolf, Marco Mascheroni, A. Pérez-Calero Yzquierdo , et al. · 2019

Hundreds of physicists analyze data collected by the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider using the CMS Remote Analysis Builder and the CMS global pool to exploit the resources of the Worldwide LHC Computing …

Exploring GlideinWMS and HTCondor scalability frontiers for an expanding CMS Global Pool Open

A. Pérez-Calero Yzquierdo, Brian Bockelman, Diego Davila Foyo, K. Hurtado Anampa, T. Ivanov , et al. · 2019

The CMS Submission Infrastructure Global Pool, built on Glidein-WMS andHTCondor, is a worldwide distributed dynamic pool responsible for the allocation of resources for all CMS computing workloads. Matching the continuously increasing dema…

Producing Madgraph5_aMC@NLO gridpacks and using TensorFlow GPU resources in the CMS HTCondor Global Pool Open

Brian Bockelman, Edgar Fajardo Hernandez, Diego Davila Foyo, K. Hurtado Anampa, Farrukh Aftab Khan , et al. · 2019

The CMS experiment has an HTCondor Global Pool, composed of more than 200K CPU cores available for Monte Carlo production and the analysis of da.The submission of user jobs to this pool is handled by either CRAB, the standard workflow mana…

Improving the Scheduling Efficiency of a Global Multi-Core HTCondor Pool in CMS Open

Brian Bockelman, Diego Davila Foyo, K. Hurtado Anampa, T. Ivanov, Farrukh Aftab Khan , et al. · 2019

Scheduling multi-core workflows in a global HTCondor pool is a multi-dimensional problem whose solution depends on the requirements of the job payloads, the characteristics of available resources, and the boundary conditions such as fair s…

The LHC Tier-1 at PIC: ten years of operations Open

J. Flix, Esther Acción, V Acín, Carles Acosta‐Silva, Gerard Bernabeu , et al. · 2017

This paper summarizes ten years of operational experience of the WLCG Tier-1 computer centre at Port d’Informació Científica (PIC), which serves the ATLAS, CMS and LHCb experiments. The centre, located in Barcelona (Spain), has supported a…

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