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Prototype of a File-Based High-Level Trigger in CMS
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 $\sim$1\,MB size are built at the level...
| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
2013
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1088/1742-6596/513/1/012025 http://cds.cern.ch/record/1622282 |
| _version_ | 1780933239940055040 |
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| author | Bauer, Gerry Behrens, Ulf Branson, James Chaze, Olivier Cittolin, Sergio Coarasa Perez, Jose Antonio Darlea, Georgiana Lavinia Deldicque, Christian Dobson, Marc Dupont, Aymeric Erhan, Samim Gigi, Dominique Glege, Frank Gomez Ceballos, Guillelmo Gomez-Reino Garrido, Robert Hartl, Christian Hegeman, Jeroen Guido Holzner, Andre Georg Masetti, Lorenzo Meijers, Franciscus Meschi, Emilio Mommsen, Remigius Morovic, Srecko Nunez Barranco Fernandez, Carlos O'Dell, Vivian Orsini, Luciano Ozga, Wojciech Andrzej Paus, Christoph Maria Ernst Petrucci, Andrea Pieri, Marco Racz, Attila Raginel, Olivier Sakulin, Hannes Sani, Matteo Schwick, Christoph Spataru, Andrei Cristian Stieger, Benjamin Bastian Sumorok, Konstanty Veverka, Jan Christopher Colin Wakefiled Zejdl, Petr |
| author_facet | Bauer, Gerry Behrens, Ulf Branson, James Chaze, Olivier Cittolin, Sergio Coarasa Perez, Jose Antonio Darlea, Georgiana Lavinia Deldicque, Christian Dobson, Marc Dupont, Aymeric Erhan, Samim Gigi, Dominique Glege, Frank Gomez Ceballos, Guillelmo Gomez-Reino Garrido, Robert Hartl, Christian Hegeman, Jeroen Guido Holzner, Andre Georg Masetti, Lorenzo Meijers, Franciscus Meschi, Emilio Mommsen, Remigius Morovic, Srecko Nunez Barranco Fernandez, Carlos O'Dell, Vivian Orsini, Luciano Ozga, Wojciech Andrzej Paus, Christoph Maria Ernst Petrucci, Andrea Pieri, Marco Racz, Attila Raginel, Olivier Sakulin, Hannes Sani, Matteo Schwick, Christoph Spataru, Andrei Cristian Stieger, Benjamin Bastian Sumorok, Konstanty Veverka, Jan Christopher Colin Wakefiled Zejdl, Petr |
| author_sort | Bauer, Gerry |
| collection | CERN |
| description | 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 $\sim$1\,MB size are built at the level-1
trigger rate of 100\,kHz. The events are assembled by $\sim$50 builder units
(BUs). Each BU writes the raw events at $\sim$2\,GB/s to a local file system shared
with $\cal O$(10) filter-unit machines (FUs) running the HLT code. The FUs read the
raw data from the file system, select $\cal O$(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. |
| id | cern-1622282 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2013 |
| record_format | invenio |
| spelling | cern-16222822019-09-30T06:29:59Zdoi:10.1088/1742-6596/513/1/012025http://cds.cern.ch/record/1622282engBauer, GerryBehrens, UlfBranson, JamesChaze, OlivierCittolin, SergioCoarasa Perez, Jose AntonioDarlea, Georgiana LaviniaDeldicque, ChristianDobson, MarcDupont, AymericErhan, SamimGigi, DominiqueGlege, FrankGomez Ceballos, GuillelmoGomez-Reino Garrido, RobertHartl, ChristianHegeman, Jeroen GuidoHolzner, Andre GeorgMasetti, LorenzoMeijers, FranciscusMeschi, EmilioMommsen, RemigiusMorovic, SreckoNunez Barranco Fernandez, CarlosO'Dell, VivianOrsini, LucianoOzga, Wojciech AndrzejPaus, Christoph Maria ErnstPetrucci, AndreaPieri, MarcoRacz, AttilaRaginel, OlivierSakulin, HannesSani, MatteoSchwick, ChristophSpataru, Andrei CristianStieger, Benjamin BastianSumorok, KonstantyVeverka, JanChristopher Colin WakefiledZejdl, PetrPrototype of a File-Based High-Level Trigger in CMSDetectors and Experimental TechniquesThe 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 $\sim$1\,MB size are built at the level-1 trigger rate of 100\,kHz. The events are assembled by $\sim$50 builder units (BUs). Each BU writes the raw events at $\sim$2\,GB/s to a local file system shared with $\cal O$(10) filter-unit machines (FUs) running the HLT code. The FUs read the raw data from the file system, select $\cal O$(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.CMS-CR-2013-380oai:cds.cern.ch:16222822013-10-29 |
| spellingShingle | Detectors and Experimental Techniques Bauer, Gerry Behrens, Ulf Branson, James Chaze, Olivier Cittolin, Sergio Coarasa Perez, Jose Antonio Darlea, Georgiana Lavinia Deldicque, Christian Dobson, Marc Dupont, Aymeric Erhan, Samim Gigi, Dominique Glege, Frank Gomez Ceballos, Guillelmo Gomez-Reino Garrido, Robert Hartl, Christian Hegeman, Jeroen Guido Holzner, Andre Georg Masetti, Lorenzo Meijers, Franciscus Meschi, Emilio Mommsen, Remigius Morovic, Srecko Nunez Barranco Fernandez, Carlos O'Dell, Vivian Orsini, Luciano Ozga, Wojciech Andrzej Paus, Christoph Maria Ernst Petrucci, Andrea Pieri, Marco Racz, Attila Raginel, Olivier Sakulin, Hannes Sani, Matteo Schwick, Christoph Spataru, Andrei Cristian Stieger, Benjamin Bastian Sumorok, Konstanty Veverka, Jan Christopher Colin Wakefiled Zejdl, Petr Prototype of a File-Based High-Level Trigger in CMS |
| title | Prototype of a File-Based High-Level Trigger in CMS |
| title_full | Prototype of a File-Based High-Level Trigger in CMS |
| title_fullStr | Prototype of a File-Based High-Level Trigger in CMS |
| title_full_unstemmed | Prototype of a File-Based High-Level Trigger in CMS |
| title_short | Prototype of a File-Based High-Level Trigger in CMS |
| title_sort | prototype of a file-based high-level trigger in cms |
| topic | Detectors and Experimental Techniques |
| url | https://dx.doi.org/10.1088/1742-6596/513/1/012025 http://cds.cern.ch/record/1622282 |
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