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A Comparison of CPU and GPU implementations for the LHCb Experiment Run 3 Trigger

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arxiv 2105.04031 v2 pith:FVRQEQAV submitted 2021-05-09 physics.ins-det

A Comparison of CPU and GPU implementations for the LHCb Experiment Run 3 Trigger

R. Aaij , M. Adinolfi , S. Aiola , S. Akar , J. Albrecht , M. Alexander , S. Amato , Y. Amhis
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F. Archilli M. Bala G. Bassi L. Bian M.P. Blago T. Boettcher A. Boldyrev S. Borghi A. Brea Rodriguez L. Calefice M. Calvo Gomez D.H. C\'ampora P\'erez A. Cardini M. Cattaneo V. Chobanova G. Ciezarek X. Cid Vidal J.L. Cobbledick J.A.B. Coelho T. Colombo A. Contu B. Couturier D.C. Craik R. Currie P. d'Argent M. De Cian D. Derkach F. Dordei M. Dorigo L. Dufour P. Durante A. Dziurda A. Dzyuba S. Easo S. Esen P. Fernandez Declara S. Filippov C. Fitzpatrick M. Frank P. Gandini V.V. Gligorov E. Golobardes G. Graziani L. Grillo P. A. G\"unther S. Hansmann-Menzemer A.M. Hennequin L. Henry D. Hill S.E. Hollitt J. Hu W. Hulsbergen R.J. Hunter M. Hushchyn B.K. Jashal C.R. Jones S. Klaver K. Klimaszewski R. Kopecna W. Krzemien M. Kucharczyk R. Lane F. Lazzari R. Le Gac P. Li J.H. Lopes M. Lucio Martinez A. Lupato O. Lupton X. Lyu F. Machefert O. Madejczyk S. Malde J.F. Marchand S. Mariani C. Marin Benito D. Martinez Santos F. Martinez Vidal R. Matev M. Mazurek B. Mitreska D.S. Mitzel M.J. Morello H. Mu P. Muzzetto P. Naik M. Needham N. Neri N. Neufeld N.S. Nolte D. O'Hanlon A. Oyanguren M. Pepe Altarelli S. Petrucci M. Petruzzo L. Pica F. Pisani A. Piucci F. Polci A. Poluektov E. Polycarpo C. Prouve G. Punzi R. Quagliani R.I. Rabadan Trejo M. Ramos Pernas M.S. Rangel F. Ratnikov G. Raven F. Reiss V. Renaudin P. Robbe A. Ryzhikov M. Santimaria M. Saur M. Schiller R. Schwemmer B. Sciascia A. Solomin F. Suljik N. Skidmore M.D. Sokoloff P. Spradlin M. Stahl S. Stahl H. Stevens L. Sun A. Szabelski T. Szumlak M. Szymanski D.Y. Tou G. Tuci A. Usachov N. Valls Canudas R. Vazquez Gomez S. Vecchi M. Vesterinen X. Vilasis-Cardona D. Vom Bruch Z. Wang T. Wojton M. Whitehead M. Williams M. Witek Y. Xie A. Xu H. Yin M. Zdybal O. Zenaiev D. Zhang L. Zhang X. Zhu
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classification physics.ins-det
keywords implementationtriggercomparisonexperimentgpu-basedlhcboptionsupgrade
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The LHCb experiment at CERN is undergoing an upgrade in preparation for the Run 3 data taking period of the LHC. As part of this upgrade the trigger is moving to a fully software implementation operating at the LHC bunch crossing rate. We present an evaluation of a CPU-based and a GPU-based implementation of the first stage of the High Level Trigger. After a detailed comparison both options are found to be viable. This document summarizes the performance and implementation details of these options, the outcome of which has led to the choice of the GPU-based implementation as the baseline.

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