| Issue |
EPJ Web Conf.
Volume 214, 2019
23rd International Conference on Computing in High Energy and Nuclear Physics (CHEP 2018)
|
|
|---|---|---|
| Article Number | 01046 | |
| Number of page(s) | 5 | |
| Section | T1 - Online computing | |
| DOI | https://doi.org/10.1051/epjconf/201921401046 | |
| Published online | 17 September 2019 | |
https://doi.org/10.1051/epjconf/201921401046
Implementation Of The Atlas Trigger Within The Multithreaded Athenamt Framework
Particle Physics Department STFC Rutherford Appleton Laboratory Harwell Campus,
Didcot,
OX11 0QX
* e-mail: stewart.martin-haugh@stfc.ac.uk
Published online: 17 September 2019
We present an implementation of the ATLAS High Level Trigger (HLT) that provides parallel execution of trigger algorithms within the ATLAS multithreaded software framework, AthenaMT. This development will enable the HLT to meet future challenges from the evolution of computing hardware and upgrades of the Large Hadron Collider (LHC) and ATLAS Detector. During the LHC data-taking period starting in 2021, luminosity will reach up to three times the original design value. In the following data-taking period (2026) upgrades to the ATLAS trigger architecture will increase the HLT input rate by a factor of 4-10, while the luminosity will increase by a further factor of 2-3.
AthenaMT provides a uniform interface for offine and trigger algorithms, facilitating the use of offine code in the HLT. Trigger-specific optimizations provided by the framework include early event rejection and reconstruction within restricted geometrical regions. We report on the current status, including experience of migrating trigger selections to this new framework,and present the next steps towards a full implementation of the redesigned ATLAS trigger.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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