학술논문
The CMS High Level Trigger System
Document Type
Periodical
Author
Afaq, A.; Badgett, W.; Bauer, G.; Biery, K.; Boyer, V.; Branson, J.; Brett, A.; Cano, E.; Carboni, A.; Cheung, H.; Ciganek, M.; Cittolin, S.; Dagenhart, W.; Erhan, S.; Gigi, D.; Glege, F.; Gomez-Reino, R.; Gulmini, M.; Gutleber, J.; Jacobs, C.; Kim, J. C.; Klute, M.; Kowalkowski, J.; Lipeles, E.; Lopez Perez, J. A.; Maron, G.; Meijers, F.; Meschi, E.; Moser, R.; Gutierrez Mlot, E.; Murray, S.; Oh, A.; Orsini, L.; Paus, C.; Petrucci, A.; Pieri, M.; Pollet, L.; Racz, A.; Sakulin, H.; Sani, M.; Schieferdecker, P.; Schwick, C.; Sexton-Kennedy, E.; Sumorok, K.; Suzuki, I.; Tsirigkas, D.; Varela, J.
Source
IEEE Transactions on Nuclear Science IEEE Trans. Nucl. Sci. Nuclear Science, IEEE Transactions on. 55(1):172-175 Feb, 2008
Subject
Language
ISSN
0018-9499
1558-1578
1558-1578
Abstract
The CMS Data Acquisition (DAQ) System relies on a purely software driven High Level Trigger (HLT) to reduce the full Level 1 accept rate of 100 kHz to approximately 100 Hz for archiving and later offline analysis. The HLT operates on the full information of events assembled by an event builder collecting detector data from the CMS front-end systems. The HLT software consists of a sequence of reconstruction and filtering modules executed on a farm of O(1000) CPUs built from commodity hardware. This paper presents the architecture of the CMS HLT, which integrates the CMS reconstruction framework in the online environment. The mechanisms to configure, control, and monitor the Filter Farm and the procedures to validate the filtering code within the DAQ environment are described.