会议论文详细信息
21st International Conference on Computing in High Energy and Nuclear Physics
Performance and development plans for the Inner Detector trigger algorithms at ATLAS
物理学;计算机科学
Martin-Haugh, Stewart^1
Rutherford Appleton Laboratory Harwell, Oxford, Didcot
OX11 0QX, United Kingdom^1
关键词: High-level triggers;    Parameter resolution;    Precision tracking;    Relative performance;    Single-stage process;    Tracking algorithm;    Tracking strategies;    Trigger algorithms;   
Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/664/8/082029/pdf
DOI  :  10.1088/1742-6596/664/8/082029
学科分类:计算机科学(综合)
来源: IOP
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【 摘 要 】

A description of the design and performance of the newly re-implemented tracking algorithms for the ATLAS trigger for LHC Run 2, to commence in spring 2015, is presented. The ATLAS High Level Trigger (HLT) has been restructured to run as a more flexible single stage process, rather than the two separate Level 2 and Event Filter stages used during Run 1. To make optimal use of this new scenario, a new tracking strategy has been implemented for Run 2. This new strategy will use a FastTrackFinder algorithm to directly seed the subsequent Precision Tracking, and will result in improved track parameter resolution and significantly faster execution times than achieved during Run 1 and with better efficiency. The timings of the algorithms for electron and tau track triggers are presented. The profiling infrastructure, constructed to provide prompt feedback from the optimisation, is described, including the methods used to monitor the relative performance improvements as the code evolves. The online deployment and commissioning are also discussed.

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