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LHCb Computing Activities in UK Current activities UK GRID activities RICH s/w activities

LHCb Computing Activities in UK Current activities UK GRID activities RICH s/w activities. Architecture of LHCb Computing Model - based on a distributed multi-Tier regional centre. Processing of real data at CERN ( production centre ) Regional centre simulation production.

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LHCb Computing Activities in UK Current activities UK GRID activities RICH s/w activities

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  1. LHCb Computing Activities in UK • Current activities • UK GRID activities • RICH s/w activities

  2. Architecture of LHCb Computing Model - based on a distributed multi-Tier regional centre Processing of real data at CERN (production centre) Regional centre simulation production

  3. Present Facilities: • Liverpool MAP - 300 node facility • RAL NT farm - closed in February after LHCb MC production • RAL CSF facility - 120 node Linux facility • RAL datastore - IBM 3494 tape robot • RAL NT delivered approx 100k RAWH events/week • MAP can deliver ~16k DST2 events/week if dedicated to LHCb

  4. Exists Planned Proposed LHCb-UK “Testbed” CERN pcrd25.cern.ch lxplus009.cern.ch RAL CSF 120 Linux cpu IBM 3494 tape robot Institutes LIVERPOOL MAP 300 Linux cpu RAL (PPD) Bristol RAL DataGrid Testbed Imperial College GLASGOW/ EDINBURGH “Proto-Tier 2” Oxford Cambridge

  5.  250 PC99 JREI funding ~£0.4M

  6. Prototype “testbed” Architecture • Based around existing production facilities • Intel PCs running Linux Redhat 6.1 • Mixture of batch systems (LSF at CERN, PBS at RAL, FCS at MAP). • Globus 1.1.3 everywhere. • Standard file transfer tools (eg. globus-rcp, GSIFTP). • GASS servers for secondary storage? • Java tools for controlling production, bookkeeping, etc. • MDS/LDAP for bookkeeping database(s).

  7. GRID Activities • Globus been used to remotely submit scripts and run SICBMC (CERN/RAL/Liverpool) • LHCb batch (PBS) jobs run on RAL CSF via Globus • ongoing investigations of Globus toolkt: globus-rcp, GSIFTP, RAL datastore as GASS server • work on-going to “open up” MAP for general use i.e analysis type activitites • co-ordinating LHCb external computing - work on-going on baseline DataModel • work on-going to harness University NT resources • major i/p to Grid PP proposal (most detailed forward look of all UK LHC expts) - disappointment on the emphasis of final document

  8. Summary of current UK LHCb resources • 2,775 SI95 shared for LHCb between RAL & Liverpool (the lion’s share being MAP) • will increase due to RAL upgrade to 3,400 SI95 in March • end of 2001 “Scotch” facility add additional 2,250 SI95 •  total end of 2001 to 5,650 SI95 • by end of 2001 3.5Tb disk space distributed across RAL/Edinburgh/Liverpool • at RAL an additional 13Tb robotic tape by year end

  9. Estimation of needs by 2003 Assume 10-15% of 2006-2007 resources needed in 2003 & assuming UK contribution 20-25%  10,800-20,250 SI95 needed 7-14 Tb of disk 23-48Tb of “robotic” storage Figures consistent with “bottom-up” estimation performed at CERN Factors 2-4 greater than resources available by end of 2001

  10. RICH software • UK is co-ordinating the s/w effort • current FORTRAN simulation written by UK • FORTRAN simulation used in current RICH studies still (e.g. alignment studies & optimisation wrt T11) • since TDR move towards OO - UK prominent (e.g. GEANT4 studies, interfacing current FORTRAN databanks to OO-framework…) • investigation of fast RICH reconstruction

  11. Rich simulation with OO software (work just getting underway) Simulation of testbeam setup – testing of Čerenkov radiation within GEANT4 Interfacing current info. from FORTRAN simulation into OO environment Interest in photodetector simulation OO environment

  12. Fast Online Rich Particle Identification • developing complimentary PID algorithm to offline method for use in online applications • online PID searches for potential Čerenkov rings for a single track. Much less computation involved and therefore faster. • initial results with algorithm are encouraging and studies into potential online applications are progressing. • possible gains in global PID performance with online results merged with global algorithm, for example background suppression.

  13. Summary • UK in LHCb in prominent position leading Grid effort • vital momentum remain and built upon through “GridPP” effort • UK leading position in RICH s/w - UK effort is now moving into OO s/w and use of RICH “online”

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