Nov 4 – 8, 2019
Adelaide Convention Centre
Australia/Adelaide timezone

Implementation of the ATLAS trigger within the multi-threaded AthenaMT framework

Nov 5, 2019, 5:15 PM
Riverbank R4 (Adelaide Convention Centre)

Riverbank R4

Adelaide Convention Centre

Oral Track X – Crossover sessions from online, offline and exascale Track X – Crossover sessions


Teng Jian Khoo (Universite de Geneve (CH))


Athena is the software framework used in the ATLAS experiment throughout the data processing path, from the software trigger system through offline event reconstruction to physics analysis. The shift from high-power single-core CPUs to multi-core systems in the computing market means that the throughput capabilities of the framework have become limited by the available memory per process. For Run 2 of the Large Hadron Collider (LHC), ATLAS has exploited a multi-process forking approach with the copy-on-write mechanism to reduce the memory use. To better match the increasing CPU core count and the, therefore, decreasing available memory per core, a multi-threaded framework, AthenaMT, has been designed and is now being implemented. The ATLAS High Level Trigger (HLT) system has been remodelled to fit the new framework and to rely on common solutions between online and offline software to a greater extent than in Run 2.

We present the implementation of the new HLT system within the AthenaMT framework, which will be used in ATLAS data-taking during Run 3 (2021-2023) of the LHC.

Consider for promotion No

Primary authors

Teng Jian Khoo (Universite de Geneve (CH)) Savanna Marie Shaw (University of Manchester)

Presentation materials