A Comparison of CPU and GPU implementations for the LHCb Experiment Run 3 Trigger
Creators: name: Aaij, R.
name: Adinolfi, M.
name: Aiola, S.
name: Akar, S.
name: Albrecht, J.
name: Alexander, M.
name: Amato, S.
name: Amhis, Y.
name: Archilli, F.
name: Bala, M.
name: Bassi, G.
name: Bian, L.
name: Blago, M. P.
name: Boettcher, T.
name: Boldyrev, A.
name: Borghi, S.
name: Rodriguez, A. Brea
name: Calefice, L.
name: Gomez, M. Calvo
name: Pérez, D. H. Cámpora
name: Cardini, A.
name: Cattaneo, M.
name: Chobanova, V.
name: Ciezarek, G.
name: Vidal, X. Cid
name: Cobbledick, J. L.
name: Coelho, J. A. B.
name: Colombo, T.
name: Contu, A.
name: Couturier, B.
name: Craik, D. C.
name: Currie, R.
name: d'Argent, P.
name: De Cian, M.
name: Derkach, D.
name: Dordei, F.
name: Dorigo, M.
name: Dufour, L.
name: Durante, P.
name: Dziurda, A.
name: Dzyuba, A.
name: Easo, S.
name: Esen, S.
name: Declara, P. Fernandez
name: Filippov, S.
name: Fitzpatrick, C.
name: Frank, M.
name: Gandini, P.
name: Gligorov, V. V.
name: Golobardes, E.
name: Graziani, G.
name: Grillo, L.
name: Günther, P. A.
name: Hansmann-Menzemer, S.
name: Hennequin, A. M.
name: Henry, L.
name: Hill, D.
name: Hollitt, S. E.
name: Hu, J.
name: Hulsbergen, W.
name: Hunter, R. J.
name: Hushchyn, M.
name: Jashal, B. K.
name: Jones, C. R.
name: Klaver, S.
name: Klimaszewski, K.
name: Kopecna, R.
name: Krzemien, W.
name: Kucharczyk, M.
name: Lane, R.
name: Lazzari, F.
name: Gac, R. Le
name: Li, P.
name: Lopes, J. H.
name: Martinez, M. Lucio
name: Lupato, A.
name: Lupton, O.
name: Lyu, X.
name: Machefert, F.
name: Madejczyk, O.
name: Malde, S.
name: Marchand, J. F.
name: Mariani, S.
name: Benito, C. Marin
name: Santos, D. Martinez
name: Vidal, F. Martinez
name: Matev, R.
name: Mazurek, M.
name: Mitreska, B.
name: Mitzel, D. S.
name: Morello, M. J.
name: Mu, H.
name: Muzzetto, P.
name: Naik, P.
name: Needham, M.
name: Neri, N.
name: Neufeld, N.
name: Nolte, N. S.
name: O'Hanlon, D.
name: Oyanguren, A.
name: Altarelli, M. Pepe
name: Petrucci, S.
name: Petruzzo, M.
name: Pica, L.
name: Pisani, F.
name: Piucci, A.
name: Polci, F.
name: Poluektov, A.
name: Polycarpo, E.
name: Prouve, C.
name: Punzi, G.
name: Quagliani, R.
name: Trejo, R. I. Rabadan
name: Pernas, M. Ramos
name: Rangel, M. S.
name: Ratnikov, F.
name: Raven, G.
name: Reiss, F.
name: Renaudin, V.
name: Robbe, P.
name: Ryzhikov, A.
name: Santimaria, M.
name: Saur, M.
name: Schiller, M.
name: Schwemmer, R.
name: Sciascia, B.
name: Solomin, A.
name: Suljik, F.
name: Skidmore, N.
name: Sokoloff, M. D.
name: Spradlin, P.
name: Stahl, M.
name: Stahl, S.
name: Stevens, H.
name: Sun, L.
name: Szabelski, A.
name: Szumlak, T.
name: Szymanski, M.
name: Tou, D. Y.
name: Tuci, G.
name: Usachov, A.
name: Canudas, N. Valls
name: Gomez, R. Vazquez
name: Vecchi, S.
name: Vesterinen, M.
name: Vilasis-Cardona, X.
name: Bruch, D. Vom
name: Wang, Z.
name: Wojton, T.
name: Whitehead, M.
name: Williams, M.
name: Witek, M.
name: Xie, Y.
name: Xu, A.
name: Yin, H.
name: Zdybal, M.
name: Zenaiev, O.
name: Zhang, D.
name: Zhang, L.
name: Zhu, X.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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.
description: 30 pages, 15 figures, 8 tables