1 / 9

LHCb Computing Status Report for LHCC Referees - June 14, 2011

This report outlines the LHCb computing status as of June 14, 2011, focusing on data-taking performance, resource usage, and reprocessing efforts. Key highlights include a constant luminosity of ~10 pb−1/day and a sustained HLT rate of 3kHz for physics data. The usage of Tier 1 resources during data taking has led to saturation and large job queues. Additionally, the report discusses future reprocessing strategies utilizing Tier 2 sites and notes ongoing memory usage issues linked to I/O volumes. Recommendations for improvement and resource allocation are provided.

aloha
Télécharger la présentation

LHCb Computing Status Report for LHCC Referees - June 14, 2011

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related