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 ∼1 MB size are built at the level-1 tri...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2021
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| Online Access: | https://hdl.handle.net/1721.1/137453 |
| _version_ | 1810976400079847424 |
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| author | Bauer, G Bawej, T Behrens, U Branson, J Chaze, O Cittolin, S Coarasa, J A Darlea, G-L Deldicque, C Dobson, M Dupont, A Erhan, S Gigi, D Glege, F Gomez-Ceballos, G Gomez-Reino, R Hartl, C Hegeman, J Holzner, A Masetti, L Meijers, F Meschi, E Mommsen, R K Morovic, S Nunez-Barranco-Fernandez, C O'Dell, V Orsini, L Ozga, W Paus, C Petrucci, A Pieri, M Racz, A Raginel, O Sakulin, H Sani, M Schwick, C Spataru, AC Stieger, B Sumorok, K Veverka, J Wakefiled, C C Zejdl, P |
| author2 | Massachusetts Institute of Technology. Laboratory for Nuclear Science |
| author_facet | Massachusetts Institute of Technology. Laboratory for Nuclear Science Bauer, G Bawej, T Behrens, U Branson, J Chaze, O Cittolin, S Coarasa, J A Darlea, G-L Deldicque, C Dobson, M Dupont, A Erhan, S Gigi, D Glege, F Gomez-Ceballos, G Gomez-Reino, R Hartl, C Hegeman, J Holzner, A Masetti, L Meijers, F Meschi, E Mommsen, R K Morovic, S Nunez-Barranco-Fernandez, C O'Dell, V Orsini, L Ozga, W Paus, C Petrucci, A Pieri, M Racz, A Raginel, O Sakulin, H Sani, M Schwick, C Spataru, AC Stieger, B Sumorok, K Veverka, J Wakefiled, C C Zejdl, P |
| author_sort | Bauer, G |
| collection | MIT |
| 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 ∼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. |
| first_indexed | 2024-09-23T08:54:40Z |
| format | Article |
| id | mit-1721.1/137453 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:54:40Z |
| publishDate | 2021 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1374532023-03-28T19:38:32Z Prototype of a File-Based High-Level Trigger in CMS Bauer, G Bawej, T Behrens, U Branson, J Chaze, O Cittolin, S Coarasa, J A Darlea, G-L Deldicque, C Dobson, M Dupont, A Erhan, S Gigi, D Glege, F Gomez-Ceballos, G Gomez-Reino, R Hartl, C Hegeman, J Holzner, A Masetti, L Meijers, F Meschi, E Mommsen, R K Morovic, S Nunez-Barranco-Fernandez, C O'Dell, V Orsini, L Ozga, W Paus, C Petrucci, A Pieri, M Racz, A Raginel, O Sakulin, H Sani, M Schwick, C Spataru, AC Stieger, B Sumorok, K Veverka, J Wakefiled, C C Zejdl, P Massachusetts Institute of Technology. Laboratory for Nuclear Science Massachusetts Institute of Technology. Department of Physics MIT Energy Initiative 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. 2021-11-05T13:42:45Z 2021-11-05T13:42:45Z 2014-06-11 2019-05-10T12:46:26Z Article http://purl.org/eprint/type/ConferencePaper 1742-6588 1742-6596 https://hdl.handle.net/1721.1/137453 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). en 10.1088/1742-6596/513/1/012025 Creative Commons Attribution 3.0 unported license https://creativecommons.org/licenses/by/3.0/ application/pdf IOP Publishing IOP Publishing |
| spellingShingle | Bauer, G Bawej, T Behrens, U Branson, J Chaze, O Cittolin, S Coarasa, J A Darlea, G-L Deldicque, C Dobson, M Dupont, A Erhan, S Gigi, D Glege, F Gomez-Ceballos, G Gomez-Reino, R Hartl, C Hegeman, J Holzner, A Masetti, L Meijers, F Meschi, E Mommsen, R K Morovic, S Nunez-Barranco-Fernandez, C O'Dell, V Orsini, L Ozga, W Paus, C Petrucci, A Pieri, M Racz, A Raginel, O Sakulin, H Sani, M Schwick, C Spataru, AC Stieger, B Sumorok, K Veverka, J Wakefiled, C C Zejdl, P 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 |
| url | https://hdl.handle.net/1721.1/137453 |
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