Experience in SYCL/oneAPI for event reconstruction at the CMS experiment

Journal of Physics Conference Series, vol. 3206, pp. 012021

Abstract

Abstract The CMS software framework (CMSSW) has been recently extended to integrate heterogeneous computing with the aim of performing part of the physics reconstruction with GPUs to face the computational challenge that will come with the increase of luminosity during the High-Luminosity phase of the Large Hadron Collider (HL-LHC). To avoid writing a different implementation of the code for each backend, a performance portability library is used: Alpaka has been chosen as the compatibility layer for Run-3. With the idea of exploring new solutions, SYCL has been considered since it would allow to target also Intel GPUs. SYCL is a cross-platform abstraction C++ programming model for heterogeneous computing. It allows developers to reuse code across different hardware and also perform custom tuning for a specific accelerator. The SYCL implementation used in this work is the Data Parallel C++ library (DPC++) in the Intel oneAPI Toolkit. This work shows the performance of physics reconstruction algorithms written in SYCL on different hardware. Strengths and weaknesses of this heterogeneous programming model will also be presented.

Authors 9

1. Nikolaos Andriotis

   Barcelona Supercomputing Center

   Affiliation as printed

   Barcelona Supercomputing Center

2. Andrea Bocci

   European Organization for Nuclear Research

   Affiliation as printed

   CERN,

3. Laura Cappelli

   Istituto Nazionale di Fisica Nucleare, Centro Nazionale Analisi Fotogrammi · Istituto Nazionale di Fisica Nucleare, Sezione di Bologna

   Affiliation as printed

   INFN CNAF Bologna

4. Tony Di Pilato

   University of Geneva · Center for Advanced Systems Understanding

   Affiliation as printed

   Center for Advanced Systems Understanding (CASUS)

   University of Geneva

5. Luca Ferragina

   University of Bologna

   Affiliation as printed

   University of Bologna

6. Juan Jose Olivera Loyola

   Tecnológico de Monterrey

   Affiliation as printed

   Institute of Technology and Higher Studies of Monterrey

7. F Pantaleo

   European Organization for Nuclear Research

   Affiliation as printed

   CERN,

8. Aurora Perego

   University of Milano-Bicocca

   Affiliation as printed

   University of Milano Bicocca

9. W. Redjeb Aachen

   European Organization for Nuclear Research · RWTH Aachen University

   Affiliation as printed

   CERN,

   RWTH Aachen University