Computing for LHCbItaly Domenico Galli and Umberto Marconi

Computing for LHCb-Italy Domenico Galli and Umberto Marconi Dipartimento di Fisica and INFN Bologna Genève, july 5, 2000

Milestones n n On June 15, the LHCb-Italy computing plan was presented to INFN “Commissione I”. On July 4, the LHCb-Italy detailed request was submitted to INFN referees. On September 7, we will meet INFN referees. On September 15, the response of “Commissione I” for 2001 investments is expected. Computing for LHCb-Italy Domenico Galli and Umberto Marconi

Plans for Monte Carlo Production from 2001 to 2005 n n In 2001 we will produce ~2 ´ 108 simulated events for detector and trigger optimisation (detector TDRs expected in 2001 and early 2002); In 2002 -2005 we will start to produce very large samples of simulated events, in particular background, for physics studies (2. 4´ 106 evt in 2002, 7´ 106 in 2003, 1. 5´ 107 in 2004, …); Computing for LHCb-Italy Domenico Galli and Umberto Marconi

Statistics needed for trigger optimisation Signal Minimum bias Events CPU time # [SI 95 s] L 0 1. 5´ 106 5´ 109 3´ 105 4. 5´ 108 L 1 3´ 106 1010 7´ 106 1010 5. 5´ 106 2´ 1010 2´ 108 3´ 1011 Trigger L 2/3 Computing for LHCb-Italy Domenico Galli and Umberto Marconi

CPU time needed for L 0 trigger optimisation Events CPU time/evt Total CPU time # [Si 95 s/evt] [Si 95 s] Signal M. B. Generation 1. 5´ 107 3´ 105 Tracking 1. 5´ 106 Digitisation Reconstruction Total Signal M. B. 200 3´ 109 6´ 107 3´ 105 1000 1. 5´ 109 3´ 108 1. 5´ 106 3´ 105 100 1. 5´ 108 3´ 107 1. 5´ 106 3´ 105 250 3. 8´ 108 7. 5´ 107 1550 5´ 109 4. 5´ 108 Computing for LHCb-Italy Domenico Galli and Umberto Marconi

CPU time needed for L 1 trigger optimisation Events CPU time/evt Total CPU time # [Si 95 s/evt] [Si 95 s] Signal M. B. Generation 3´ 107 7´ 106 Tracking 3´ 106 Digitisation Reconstruction Total Signal M. B. 200 6´ 109 1. 4´ 109 7´ 106 1000 3´ 109 7´ 109 3´ 106 7´ 106 100 3´ 108 7´ 108 3´ 106 7´ 106 250 7. 5´ 108 1. 8´ 109 1550 1010 Computing for LHCb-Italy Domenico Galli and Umberto Marconi

CPU time needed for L 2 trigger optimisation Events CPU time/evt Total CPU time # [Si 95 s/evt] [Si 95 s] Signal M. B. Generation 5. 5´ 107 2´ 108 200 1. 1´ 1010 4´ 1010 Tracking 5. 5´ 106 2´ 108 1000 5. 5´ 109 2´ 1011 Digitisation 5. 5´ 106 2´ 108 100 5. 5 ´ 108 2´ 1010 Trigger L 0/L 1 5. 5´ 106 2´ 108 100 5. 5´ 108 2´ 1010 Reconstruction 1. 5´ 106 5´ 105 250 3. 8´ 108 1. 3´ 108 1650 2´ 1010 3´ 1011 Total Computing for LHCb-Italy Domenico Galli and Umberto Marconi

Total Requirements for LHCb Tier-1 Units 2001 2002 2003 2004 2005 Signal events a-1 107 1. 2´ 106 3´ 106 5´ 106 107 Background events a-1 2´ 108 1. 2´ 106 4´ 106 107 109 CPU for signal SI 95 700 1. 15´ 104 3´ 104 5´ 104 105 CPU for background SI 95 10800 1. 85´ 104 6. 4´ 104 1. 6´ 105 4´ 104 CPU for analysis SI 95 0 4000 7500 1. 3´ 104 2. 5´ 104 RAWmc disc TB 0. 5 0. 8 1. 4 3 202 RAWmc tape TB 0. 5 0. 8 1. 4 3 ESDmc disc TB 0. 25 0. 4 0. 7 1. 5 101 AOD disc TB 0. 1 0. 3 0. 5 50 TAG disc TB 0 0 0. 015 2 202 Computing for LHCb-Italy Domenico Galli and Umberto Marconi 2006 404 2007 606 2008 808 2009 2010 1212

Total Requirements for LHCb Tier-1 (II) SI 95 TB Computing for LHCb-Italy Domenico Galli and Umberto Marconi

Incremental acquisition of Equipment for LHCb Tier-1 Units 2001 2002 2003 2004 2005 CPU SI 95 2300 4500 13500 24200 60500 31500 Disc TB 0. 2 0. 09 0. 38 0. 69 111. 2 22. 4 Tape TB 0. 1 0. 06 0. 12 0. 32 39. 8 40. 4 n n 2006 2007 2008 2009 2010 Resources splitted up among 5 regional centres. In steady state (starting from 2006) replacement every year of 30% of CPU and of 20% of disc. Computing for LHCb-Italy Domenico Galli and Umberto Marconi

The INFN Tier-1 for LHCb n LHCb-Italy plans to concentrate the Tier-1 Regional Centre in only one site (differently from other Italian LHC groups), housed in a “consorzio di calcolo”, chosen based on economic convenience. n n n Only one installation. Same architecture of other European Tier-1 centres. No problems concerning WAN usage (routing, data transfer optimisation to obviate bandwidth, etc. ). No organisation and synchronisation requirements. Remote control of concentrated computing resources requires less bandwidth than geographically distributed data and CPUs. Transparent remote control of concentrated resources by institutes will be allowed by GRID middleware. Computing for LHCb-Italy Domenico Galli and Umberto Marconi

The INFN Tier-1 for LHCb (II) n The “consorzio” is concerned with housing of computing resources: n n n Links to electricity grid and computing network; Air conditioning; Uninterruptible power supply; Guardianship. To the “consorzio” we plan to outsource system administration: n n n Participation to system installation; Administration and monitoring; Intervention in case of hang; Intervention for restoring LAN or WAN connectivity; Backup procedures; Operating system updating and patching. Computing for LHCb-Italy Domenico Galli and Umberto Marconi

Investment plan for LHCb-Italy Units 2001 2002 2003 CPU [k. E] 100 122 228 Switch [k. E] 12 6 12 Rack [k. E] 10 5 15 Hard disc [k. E] 5. 5 1. 2 3. 9 Tape [k. E] 0. 11 0. 03 0. 04 Tape driver [k. E] 4 0 0 Total hardware [k. E] 132 134 259 # 50 111 225 Electric power [k. E] 11 24 48 Housing [k. E] 10 15 28 System administration staff [k. E] 30 50 63 Total operating costs [k. E] 51 89 129 Grand total [k. E] 183 223 388 CPU number (integral) Computing for LHCb-Italy Domenico Galli and Umberto Marconi

Computing group of LHCb-Italy Site Test-bed HEP applications DATAGRID Maurizio Bonesini MI 10% - - 10% Walter Bonivento CA 20% - - 20% Domenico Galli Alberto Gianoli BO FE 40% 50% - 30% - 70% 50% Giacomo Graziani FI 20% - 40% Umberto Marconi BO 40% - 30% 70% Marco Paganoni MI 20% - - 20% Giovanni Passaleva FI 20% - - 20% Total Roberta Santacesaria RM 1 - 20% Nicola Semprini Cesari BO - 30% Vincenzo Vagnoni BO 30% 20% - 50% Stefania Vecchi BO - 40% 250% 130% 60% 440% Total Computing for LHCb-Italy Domenico Galli and Umberto Marconi