TY - JOUR
T1 - Event and data persistency models for the LHCb Real Time Analysis System
AU - De Cian, Michel
AU - Esen, Sevda
AU - Hennequin, Arthur
AU - Vilasís-Cardona, Xavier
N1 - Publisher Copyright:
© The Authors, published by EDP Sciences.
PY - 2024/5/6
Y1 - 2024/5/6
N2 - Starting in 2022, the upgraded LHCb detector is collecting data with a pure software trigger. In its first stage, reducing the rate from 30MHz to about 1MHz, GPUs are used to reconstruct and trigger on B and D meson topologies and high-pT objects in the event. In its second stage, a CPU farm is used to reconstruct the full event and perform candidate selections, which are persisted for offline use with an output rate of about 10GB/s. Fast data processing, flexible and custom-designed data structures tailored for SIMD architectures and efficient storage of the intermediate data at various steps of the processing pipeline onto persistent media, e.g. tapes is essential to guarantee the full physics program of LHCb. We present the event model and data persistency developments for the trigger of LHCb in Run 3. Particular emphasis is given to the novel software-design aspects with respect to the Run 1+2 data taking, the performance improvements which can be achieved and the experience of restructuring a major part of the reconstruction software in a large HEP experiment.
AB - Starting in 2022, the upgraded LHCb detector is collecting data with a pure software trigger. In its first stage, reducing the rate from 30MHz to about 1MHz, GPUs are used to reconstruct and trigger on B and D meson topologies and high-pT objects in the event. In its second stage, a CPU farm is used to reconstruct the full event and perform candidate selections, which are persisted for offline use with an output rate of about 10GB/s. Fast data processing, flexible and custom-designed data structures tailored for SIMD architectures and efficient storage of the intermediate data at various steps of the processing pipeline onto persistent media, e.g. tapes is essential to guarantee the full physics program of LHCb. We present the event model and data persistency developments for the trigger of LHCb in Run 3. Particular emphasis is given to the novel software-design aspects with respect to the Run 1+2 data taking, the performance improvements which can be achieved and the experience of restructuring a major part of the reconstruction software in a large HEP experiment.
UR - http://www.scopus.com/inward/record.url?scp=85212242494&partnerID=8YFLogxK
U2 - 10.1051/epjconf/202429501026
DO - 10.1051/epjconf/202429501026
M3 - Conference article
AN - SCOPUS:85212242494
SN - 2101-6275
VL - 295
JO - EPJ Web of Conferences
JF - EPJ Web of Conferences
M1 - 01026
T2 - 26th International Conference on Computing in High Energy and Nuclear Physics, CHEP 2023
Y2 - 8 May 2023 through 12 May 2023
ER -