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CERN Published Articles

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2022-06-28
06:01
The Fast Simulation Chain in the ATLAS experiment / Javurkova, Martina (Massachusetts U., Amherst) /ATLAS Collaboration
The ATLAS experiment relies heavily on simulated data, requiring the production of billions of simulated proton-proton collisions every run period. As such, the simulation of collisions (events) is the single biggest CPU resource consumer. [...]
2021 - 10 p. - Published in : EPJ Web Conf. 251 (2021) 03012 Fulltext: PDF;
In : 25th International Conference on Computing in High-Energy and Nuclear Physics (CHEP), Online, Online, 17 - 21 May 2021, pp.03012

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2022-06-28
06:01
Monitoring reconstruction software in LHCb / Hou, Ying-Rui (Beijing, GUCAS) ; Klaver, Suzanne (Nikhef, Amsterdam) ; Malde, Sneha (Oxford U.) ; Matev, Rosen (CERN) ; Popov, Dmitry (Beijing, GUCAS) ; Saur, Miroslav (Tech. U., Dortmund (main))
The LHCb detector at the LHC is currently undergoing a major upgrade to increase its full detector read-out rate to 30 MHz. In addition to the detector hardware modernisation, the new trigger system will be software-only. [...]
2021 - 8 p. - Published in : EPJ Web Conf. 251 (2021) 03044 Fulltext: PDF;
In : 25th International Conference on Computing in High-Energy and Nuclear Physics (CHEP), Online, Online, 17 - 21 May 2021, pp.03044

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2022-06-28
06:01
Evolution of ATLAS analysis workflows and tools for the HL-LHC era / Cameron, David (Oslo U.) ; Forti, Alessandra (Manchester U.) ; Klimentov, Alexei (Brookhaven Natl. Lab.) ; Pacheco Pages, Andrés (Barcelona, IFAE ; PIC, Bellaterra) ; South, David (DESY)
The High Luminosity LHC project at CERN, which is expected to deliver a ten-fold increase in the luminosity of proton-proton collisions over LHC, will start operation towards the end of this decade and will deliver an unprecedented scientific data volume of multi-exabyte scale. This vast amount of data has to be processed and analysed, and the corresponding computing facilities must ensure fast and reliable data processing for physics analyses by scientific groups distributed all over the world. [...]
2021 - 11 p. - Published in : EPJ Web Conf. 251 (2021) 02002 Fulltext: PDF;
In : 25th International Conference on Computing in High-Energy and Nuclear Physics (CHEP), Online, Online, 17 - 21 May 2021, pp.02002

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2022-06-28
06:01
LHC Data Storage: Preparing for the Challenges of Run-3 / Arsuaga-Rios, Maria (CERN) ; Bahyl, Vladimír (CERN) ; Batalha, Manuel (CERN) ; Caffy, Cédric (CERN) ; Cano, Eric (CERN) ; Capitoni, Niccolo (CERN) ; Contescu, Cristian (CERN) ; Davis, Michael (CERN) ; Alvarez, David Fernandez (CERN) ; Guenther, Jaroslav (CERN) et al.
The CERN IT Storage Group ensures the symbiotic development and operations of storage and data transfer services for all CERN physics data, in particular the data generated by the four LHC experiments (ALICE, ATLAS, CMS and LHCb).In order to accomplish the objectives of the next run of the LHC (Run-3), the Storage Group has undertaken a thorough analysis of the experiments’ requirements, matching them to the appropriate storage and data transfer solutions, and undergoing a rigorous programme of testing to identify and solve any issues before the start of Run-3.In this paper, we present the main challenges presented by each of the four LHC experiments. We describe their workflows, in particular how they communicate with and use the key components provided by the Storage Group: the EOS disk storage system; its archival back-end, the CERN Tape Archive (CTA); and the File Transfer Service (FTS). [...]
2021 - 10 p. - Published in : EPJ Web Conf. 251 (2021) 02023 Fulltext: PDF;
In : 25th International Conference on Computing in High-Energy and Nuclear Physics (CHEP), Online, Online, 17 - 21 May 2021, pp.02023

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2022-06-28
06:01
The ATLAS Data Carousel Project Status / Borodin, Mikhail (Iowa U.) ; Di Girolamo, Alessandro (CERN) ; Karavakis, Edward (CERN) ; Klimentov, Alexei (Brookhaven) ; Korchuganova, Tatiana (Moscow RAS, IRE ; Moscow, Central Economics Math. Inst. ; Andres Bello Natl. U.) ; Lassnig, Mario (CERN) ; Maeno, Tadashi (Brookhaven Natl. Lab.) ; Padolski, Siarhei (Brookhaven Natl. Lab.) ; Zhao, Xin (Brookhaven Natl. Lab.) /ATLAS Software and Computing Collaboration
The High Luminosity upgrade to the LHC, which aims for a tenfold increase in the luminosity of proton-proton collisions at an energy of 14 TeV, is expected to start operation in 2028/29 and will deliver an unprecedented volume of scientific data at the multi-exabyte scale. This amount of data has to be stored, and the corresponding storage system must ensure fast and reliable data delivery for processing by scientific groups distributed all over the world. [...]
2021 - 7 p. - Published in : EPJ Web Conf. 251 (2021) 02006 Fulltext: PDF;
In : 25th International Conference on Computing in High-Energy and Nuclear Physics (CHEP), Online, Online, 17 - 21 May 2021, pp.02006

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2022-06-28
06:01
Building HEP Software with Spack: Experiences from Pilot Builds for Key4hep and Outlook for LCG Releases / Volkl, Valentin (CERN) ; Madlener, Thomas (DESY) ; Lin, Tao (Beijing, Inst. High Energy Phys.) ; Wang, Joseph (Hong Kong, Chinese U.) ; Konstantinov, Dmitri (Kurchatov Inst., Moscow) ; Razumov, Ivan (Kurchatov Inst., Moscow) ; Sailer, Andre (CERN) ; Ganis, Gerardo (CERN)
Consistent, efficient software builds and deployments are a common concern for all HEP experiments. This paper describes the evolution of the usage of the Spack package manager in HEP in the context of the LCG stacks and the current Spack-based management of Key4hep software. [...]
2021 - 7 p. - Published in : EPJ Web Conf. 251 (2021) 03056 Fulltext: PDF;
In : 25th International Conference on Computing in High-Energy and Nuclear Physics (CHEP), Online, Online, 17 - 21 May 2021, pp.03056

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2022-06-28
06:01
WLCG Token Usage and Discovery / Bockelman, Brian (Morgridge Inst. Res., Madison) ; Ceccanti, Andrea (INFN, Italy) ; Dack, Thomas (Daresbury) ; Dykstra, Dave (Fermilab) ; Litmaath, Maarten (CERN) ; Sallé, Mischa (Nikhef, Amsterdam) ; Short, Hannah (CERN)
Since 2017, the Worldwide LHC Computing Grid (WLCG) has been working towards enabling token based authentication and authorisation throughout its entire middleware stack. Following the publication of the WLCG Common JSON Web Token (JWT) Schema v1.0 [1] in 2019, middleware developers have been able to enhance their services to consume and validate the JWT-based [2] OAuth2.0 [3] tokens and process the authorization information they convey. [...]
FERMILAB-CONF-21-078-SCD.- 2021 - 6 p. - Published in : EPJ Web Conf. 251 (2021) 02028 Fulltext: fermilab-conf-21-078-scd - PDF; document - PDF; External link: Fermilab Library Server
In : 25th International Conference on Computing in High-Energy and Nuclear Physics (CHEP), Online, Online, 17 - 21 May 2021, pp.02028

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2022-06-28
06:01
Performance of CUDA Unified Memory in CMS Heterogeneous Pixel Reconstruction / Kortelainen, Matti J (Fermilab) ; Kwok, Martin (Fermilab) /CMS Collaboration
The management of separate memory spaces of CPUs and GPUs brings an additional burden to the development of software for GPUs. To help with this, CUDA unified memory provides a single address space that can be accessed from both CPU and GPU. [...]
FERMILAB-CONF-21-064-SCD.- 2021 - 8 p. - Published in : EPJ Web Conf. 251 (2021) 03035 Fulltext: fermilab-conf-21-064-scd - PDF; document - PDF; External link: Fermilab Library Server
In : 25th International Conference on Computing in High-Energy and Nuclear Physics (CHEP), Online, Online, 17 - 21 May 2021, pp.03035

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2022-06-28
06:01
An automated tool to facilitate consistent test-driven development of trigger selections for LHCb’s Run 3 / Hunter, Ross (Warwick U.) ; Lupton, Olli (Warwick U.) ; Matev, Rosen (CERN) ; Stahl, Sascha (CERN) ; Vesterinen, Mika (Warwick U.)
Upon its restart in 2022, the LHCb experiment at the LHC will run at higher instantaneous luminosity and utilize an unprecedented full-software trigger, promising greater physics reach and efficiency. On the flip side, conforming to offline data storage constraints becomes far more challenging. [...]
2021 - 9 p. - Published in : EPJ Web Conf. 251 (2021) 04024 Fulltext: PDF;
In : 25th International Conference on Computing in High-Energy and Nuclear Physics (CHEP), Online, Online, 17 - 21 May 2021, pp.04024

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2022-06-28
06:01
Exploitation of HPC Resources for data intensive sciences / Girone, Maria (CERN) ; Southwick, David (CERN ; Iowa U.) ; Khristenko, Viktor (CERN) ; Medeiros, Miguel F (CERN) ; Giordano, Domenico (CERN) ; Høgstøyl, Ingvild Brevik (Norwegian U. Sci. Tech.) ; Atzori, Luca (CERN)
The Large Hadron Collider (LHC) will enter a new phase beginning in 2027 with the upgrade to the High Luminosity LHC (HL-LHC). The increase in the number of simultaneous collisions coupled with a more complex structure of a single event will result in each LHC experiment collecting, storing, and processing exabytes of data per year. [...]
2021 - 9 p. - Published in : EPJ Web Conf. 251 (2021) 02042 Fulltext: PDF;
In : 25th International Conference on Computing in High-Energy and Nuclear Physics (CHEP), Online, Online, 17 - 21 May 2021, pp.02042

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