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LHCb computing status

LHCb computing status. for LHCC referees meeting 14 th June 2011 . Data taking status. Constant luminosity ~10 pb -1 /day HLT rate as foreseen 3kHz “physics”. Tier 1 resource usage and shares. Tier 1 usage. 2011 pledge. Reprocessing during data taking. L ive data. Reprocessing.

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LHCb computing status

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  1. LHCb computing status for LHCC referees meeting 14th June 2011

  2. Data taking status • Constant luminosity • ~10 pb-1/day • HLT rate as foreseen • 3kHz “physics”

  3. Tier 1 resource usage and shares

  4. Tier 1 usage 2011 pledge

  5. Reprocessing during data taking Live data Reprocessing

  6. Reprocessing during data taking • Reminder: end of year reprocessing will take ~3 months, must start before end of run • Have reprocessed all 2011 data taken before May Technical stop • Started during TS, continued in parallel to data taking • Saturated Tier1’s, built up large queues of waiting jobs • Number of running jobs at several Tier1 is below pledges • Reasons under investigation

  7. Tier 2 usage (simulation) 2011 pledge

  8. Reprocessing prospects • Commissioning of Tier2 for reprocessing • Pilot sites selected • Production tests imminent • Use of online farm for reprocessing • Being investigated within online project • In both cases, we hope to be able to use some of these resources for 2011 reprocessing • Largely dependent on availability of manpower for commissioning, same manpower as for operations

  9. Memory usage issue POOL ROOT • Observation of logarithmic increase in memory usage of jobs • Proportional to volume of I/O • Due to way in which LHCb uses ROOT via POOL • Implemented a new persistency directly in ROOT • To be deployedbefore end of year • Allows more efficient(longer) stripping jobs

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