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HK: Fachverband Physik der Hadronen und Kerne
HK 54: Computing II
HK 54.3: Vortrag
Mittwoch, 13. März 2024, 18:00–18:15, HBR 19: C 103
The Event Processing Nodes: technical operation and performance of the ALICE GPU-based processing farm and computing model for synchronous and asynchronous data reconstruction — •Federico Ronchetti for the ALICE Germany collaboration — CERN, Esplanade des Particules 1, 1211 Geneva, CH
The Large Hadron Collider (LHC) returned to operation on July 5th, 2022. During LHC Long Shutdown 2 (2019-2021), the ALICE detector underwent a major upgrade that increased the sustainable hadronic rate from 1 to 50 kHz for Pb-Pb collisions in continuous readout mode.
The improved detector performance and the change of the data taking paradigm required the operation of a completely new computing model which merges online (synchronous) and offline (asynchronous) data processing into a single software framework.
After a short introduction of the ALICE upgrade an overview of the current ALICE computing model will be given together with a technical description with the supporting hardware facility which makes extensive use of GPU computing since due to the increased data volumes, storing all the produced raw data is infeasible. The ALICE computing model has the unique feature to be able to exploit GPU processing also for offline data reconstruction hence energy efficiency considerations on the wide-spread use of GPUs will be formulated.
Keywords: gpu; data reconstruction; synchronous processing