1 / 13

LHCb Computing

LHCb Computing. Umberto Marconi. CERN-Russia JWCG, 10/03/2008. Computing Model. Data flow and distribution. Detector (40 MHz). @Tier-2. Simulation. Trigger (2 kHz). RAW. Reconstruction. rDST. Stripping. @Tier-1. DST, TAG. User Analysis. Root-tuple. LHCb Resource Planning. CPU.

xanthe
Download Presentation

LHCb Computing

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 Umberto Marconi CERN-Russia JWCG, 10/03/2008

  2. ComputingModel 2

  3. Data flow and distribution Detector (40 MHz) @Tier-2 Simulation Trigger (2 kHz) RAW Reconstruction rDST Stripping @Tier-1 DST, TAG User Analysis Root-tuple 3

  4. LHCb Resource Planning. CPU Disk Tape 4

  5. Pledged Tier-1s 2Q2008 resources. • Tier-1s capacity and requirements for 2Q2008: Pledges are those from 1st April 2008. https://twiki.cern.ch/twiki/pub/LCG/SC4ExperimentPlans/Tier_1_Capacity_Available_and_Required_2Q2008.xls • Shortage of disk space availability at Tier-1s. 5

  6. Summary of Tier-2s Pledged Tier-2s. http://lcg.web.cern.ch/lcg/planning/phase2_resources/P2PRCcaps181207.pdf 6

  7. Russian Tier-2 Federation 7

  8. DC’06 During DC06 80% of the LHCb whole production 104 concurrent jobs running on LCG DC06 starts : June ‘06 RAW collected at CERN and distributed to the Tier-1s emulating real data taking for reconstruction and stripping at sites 8

  9. Distributed Analysis • GANGA is the UI used to submit the analysis job to the Grid. • Use of the generic agents also with the analysis job, downloaded from the DIRAC central queues. Analysis job vs time 9

  10. CCRC’08 Aims • Test the full chain: from DAQ to Tier-0 to Tier-1’s. • Test data transfer and data access running concurrently (current tests have tested individual components). • Test DB services at sites: conditions DB and LFC replicas. • Tests in May will include the analysis component. • Test the LHCb prioritisation approach to balance production and analysis at the Tier-1 centres. • Test sites response to “chaotic activity” going on in parallel to the scheduled production activity. 10

  11. CCRC’08 Planned Tasks • RAW data distribution from the pit to the Tier-0 centre. • Use of rfcp into CASTOR from pit to the T1D0 storage class. • RAW data distribution from the Tier-0 to the Tier-1 centres. • Use of FTS. Storage class T1D0. • Reconstruction of the RAW data at CERN and at the Tier-1s for the production of rDST data. • Use of SRM 2.2. Storage class T1D0 • Stripping of data at CERN and at T1 centres. • Input data: RAW and rDST on T1D0. • Output data: DST on T1D1 • Use SRM 2.2. • Distribution of DST data to all other centres • Use of FTS - T0D1 (except CERN T1D1) 11

  12. CCRC’08 Planned Tasks (II) • Preparation of RAW data will occur over the next few month • We need to merge existing MC datasets into ~2GB files • February activities: • Maintain the equivalent of 2 weeks data taking. • May activities: • Maintain equivalent of 1 month data taking. • Run fake analysis activity in parallel to production type activities using generic agents. • Generic agents are the LHCb baseline. It needs to be integral part of CCRC’08. 12

  13. Resources at Tier-1 CCRC’08 Status Report • LHCb report to LCG MB by Philippe Charpentier • http://indico.cern.ch/conferenceDisplay.py?confId=27472 13

More Related