Prototype of a File-Based High-Level Trigger in CMS
Name
Bauer_2014_J._Phys.__Conf._Ser._513_012025.pdf
Description
Published version
Size
1.47 MB
Format
Adobe PDF
Checksum (MD5)
7b6470e6ebb1154b44c4b3057b290698
Author(s)
Bauer, G
Bawej, T
Behrens, U
Branson, J
Chaze, O
Cittolin, S
Coarasa, J A
Darlea, G-L
Deldicque, C
Dobson, M
Date Issued
June 11, 2014
Publisher
IOP Publishing
Citation
Bauer, G, Bawej, T, Behrens, U, Branson, J, Chaze, O et al. 2014. "Prototype of a File-Based High-Level Trigger in CMS." 513 (1).
Version
Final published version
Abstract
The DAQ system of the CMS experiment at the LHC is upgraded during the accelerator shutdown in 2013/14. To reduce the interdependency of the DAQ system and the high-level trigger (HLT), we investigate the feasibility of using a file-system-based HLT. Events of ∼1 MB size are built at the level-1 trigger rate of 100 kHz. The events are assembled by ∼50 builder units (BUs). Each BU writes the raw events at ∼2GB/s to a local file system shared with Q(10) filter-unit machines (FUs) running the HLT code. The FUs read the raw data from the file system, select Q(1%) of the events, and write the selected events together with monitoring meta-data back to a disk. This data is then aggregated over several steps and made available for offline reconstruction and online monitoring. We present the challenges, technical choices, and performance figures from the prototyping phase. In addition, the steps to the final system implementation will be discussed. © Published under licence by IOP Publishing Ltd.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. Department of Physics
MIT Energy Initiative
Terms of Use
Creative Commons Attribution 3.0 unported license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1088/1742-6596/513/1/012025
