The performance and development for the Inner Detector Trigger algorithms at ATLAS

16th International workshop on Advanced Computing and Analysis Techniques in physics research

物理学;计算机科学

Penc, Ondrej^1

Academy of Sciences of the Czech Republic, Institute of Physics, Czech Republic^1

关键词: Inner Detector;    Optimisations;    Parameter resolution;    Precision tracking;    Relative performance;    Tracking algorithm;    Tracking strategies;    Trigger algorithms;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/608/1/012008/pdf
DOI  :  10.1088/1742-6596/608/1/012008

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

A redesign of the tracking algorithms for the ATLAS trigger for LHC's Run 2 starting in 2015 is in progress. The ATLAS HLT software has been restructured to run as a more flexible single stage HLT, instead of two separate stages (Level 2 and Event Filter) as in Run 1. The new tracking strategy employed for Run 2 will use a Fast Track Finder (FTF) algorithm to seed subsequent Precision Tracking, and will result in improved track parameter resolution and faster execution times than achieved during Run 1. The performance of the new algorithms has been evaluated to identify those aspects where code optimisation would be most beneficial. The performance and timing of the algorithms for electron and muon reconstruction in the trigger 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.