Naslov
Prototype of a File-Based High-Level Trigger in CMS

Autori
Bauer, G. ; ... ; Morović, Srećko ; ... ; Zejdl, P.

Izvornik
Journal of Physics: Conference Series (1742-6588) 513 (2014); 012025-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
DAQ system; CMS experiment; LHC

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Rad je predstavljen na 20th International Conference on Computing in High Energy and Nuclear Physics (CHEP2013).

POVEZANOST RADA