624829 SzGeCERN 20230315201104.0 oai:cds.cern.ch:624829 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN cerncds:physics SPIRES 5587492 Inspire 621782 arXiv physics/0306150 physics CHEP-2003-WEPT003 eng Brigljevic, V. INSPIRE-00069252 The CMS Event Builder COMPACT MUON SOLENOID 2003 2003-06 mult. p arXiv Conference CHEP03 Subj-class: Instrumentation and Detectors The data acquisition system of the CMS experiment at the Large Hadron Collider will employ an event builder which will combine data from about 500 data sources into full events at an aggregate throughput of 100 GByte/s. Several architectures and switch technologies have been evaluated for the DAQ Technical Design Report by measurements with test benches and by simulation. This paper describes studies of an EVB test-bench based on 64 PCs acting as data sources and data consumers and employing both Gigabit Ethernet and Myrinet technologies as the interconnect. In the case of Ethernet, protocols based on Layer-2 frames and on TCP/IP are evaluated. Results from ongoing studies, including measurements on throughput and scaling are presented. The architecture of the baseline CMS event builder will be outlined. The event builder is organised into two stages with intelligent buffers in between. The first stage contains 64 switches performing a first level of data concentration by building super-fragments from fragments of 8 data sources. The second stage combines the 64 super-fragments into full events. This architecture allows installation of the second stage of the event builder in steps, with the overall throughput scaling linearly with the number of switches in the second stage. Possible implementations of the components of the event builder are discussed and the expected performance of the full event builder is outlined. The data acquisition system of the CMS experiment at the Large Hadron Collider will employ an event builder which will combine data from about 500 data sources into full events at an aggregate throughput of 100 GByte/s. Several architectures and switch technologies have been evaluated for the DAQ Technical Design Report by measurements with test benches and by simulation. This paper describes studies of an EVB test-bench based on 64 PCs acting as data sources and data consumers and employing both Gigabit Ethernet and Myrinet technologies as the interconnect. In the case of Ethernet, protocols based on Layer-2 frames and on TCP/IP are evaluated. Results from ongoing studies, including measurements on throughput and scaling are presented. The architecture of the baseline CMS event builder will be outlined. The event builder is organised into two stages with intelligent buffers in between. The first stage contains 64 switches performing a first level of data concentration by building super-fragments from fragments of 8 data sources. The second stage combines the 64 super-fragments into full events. This architecture allows installation of the second stage of the event builder in steps, with the overall throughput scaling linearly with the number of switches in the second stage. Possible implementations of the components of the event builder are discussed and the expected performance of the full event builder is outlined. Inspire LANL EDS SzGeCERN Other Fields of Physics CERN ARTICLE CERN LHC CMS LANL EDS Instrumentation and Detectors LANL EDS Physics Bruno, G. INSPIRE-00069676 Cano, E. INSPIRE-00308066 Cittolin, S. INSPIRE-00318325 Csilling, A. INSPIRE-00075160 Gigi, D. INSPIRE-00314000 Glege, F. INSPIRE-00314039 Gomez-Reino, R. Gulmini, M. INSPIRE-00309371 Gutleber, J. INSPIRE-00309395 Jacobs, C. Kozlovszky, M. Larsen, H. INSPIRE-00205730 Magrans de Abril, I. INSPIRE-00310400 Meijers, F. INSPIRE-00314177 Meschi, E. INSPIRE-00107072 Murray, S. Oh, A. INSPIRE-00320498 Orsini, L. INSPIRE-00311140 Pollet, L. Racz, A. INSPIRE-00318150 Samyn, D. INSPIRE-00318173 Scharff-Hansen, P. Schwick, C. INSPIRE-00314370 Sphicas, P. INSPIRE-00143482 O'Dell, V. INSPIRE-00319226 Suzuki, I. INSPIRE-00022788 Berti, L. Maron, G. INSPIRE-00320176 Toniolo, N. INSPIRE-00312453 Zangrando, L. Ninane, A. Erhan, S. INSPIRE-00318963 Bhattacharya, S. Branson, J. INSPIRE-00319000 CERN? WEPT003 eConf C 0303241 2003 Talk given at C03-03-24.1 http://www.slac.stanford.edu/econf/C0303241/proc/papers/_vti_cnf/WEPT003.PDF Proceedings write-up on eConf 2439828 572261 http://cds.cern.ch/record/624829/files/arXiv:physics_0306150.pdf frans.meijers@cern.ch CERN Fermilab Legnaro Louvain-la-Neuve UCLA UCSD n 200326 13 20100417 1145 CER01 20030623 597895 WEPT003 lajolla20030324 PUBLIC 002383386CER ConferencePaper ARTICLE