Journal Article/Contribution to a conference proceedings

PUBDB-2026-00386

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Heterogeneous reconstruction of hadronic particle flow clusters with the Alpaka Portability Library

Bocci, A. ; Das, A. ; Hatakeyama, K. ; Pantaleo, F. ; Lorkowski, F. (Corresponding author)DESY* ; Redjeb, W. ; Samudio, J. ; Saunders, M. ; CMS Collaboration (Collaboration author)DESY*

2025
EDP Sciences Les Ulis

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Please use a persistent id in citations: doi:10.1051/epjconf/202533701171  doi:10.3204/PUBDB-2026-00386

Abstract: In response to increasing data challenges, CMS has adopted the use of GPU offloading at the High-Level Trigger (HLT). However, GPU code is often hardware specific, and increases the maintenance burden on software development. The Alpaka (Abstraction Library for Parallel Kernel Acceleration) portability library offers a solution to this issue, and has been implemented into the CMS software (CMSSW) for use online at HLT. A portion of the final-state particle candidate reconstruction algorithm, Particle Flow, represented a target for increased performance through parallel operation. We discuss the port of hadronic Particle Flow clustering to Alpaka, and the validation of physics and performance at HLT for 2024 data taking.

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Contributing Institute(s):

1. LHC/CMS Experiment (CMS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. LHC: CMS

Appears in the scientific report 2025

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