BaBar-Grid Status and Prospects

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BaBar-Grid Status and Prospects

• Eleonora Luppi
• Padova 16 ottobre 2003

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Distributed Computing

• Currently BaBar has a largely distributed
  computing system
• 5 Tier-A sites
• Sites that provide large resources for BaBar
• Resources agreed to via MoUs
• gt20 Tier-C sites
• University sites
• Produce majority of BaBar Monte Carlo

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Motivation

• Three large analysis sites
• Would like to be more flexible too and use other
  sites
• Need way for users to automatically submit jobs
  that run where the data and cpu is available
• Also intend that GridKa is only available via
  grid technology
• Could reduce the manpower used to run Simulation
  Production
• Each of 25 sites has 0.5FTE to keep system
  running
• Go to great lengths to make sure everything is
  identical
• Data distribution to smaller sites could be
  integrated

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CE Computing Element
SE Storage Element
RB Resource Broker
WN Worker Node
RC Replica Catalogue
VO Virtual Organisation
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Present Infrastructure

• SLAC
• will install LCG-1
• SLAC/SCS actively involved in security for Grid
  (PPDG and LCG)
• Karlsruhe
• LCG-1 User Interface installed and LCG-1 deployed
• France
• Still nothing released for users
• INFN
• LCG-1 installed in Ferrara (Grid.it)
• Genius interface developed under EDG 1.4.x is
  migrating to new release
• UK
• EDG 2.x installed.
• RB at Imperial College installed
• Imperial College will have a LCG-1 RB soon

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BaBarGrid Analysis

• Successful test using EDG v 1.4.x
• Prepare executable locally
• Copy executable to SE and register to RC
• Prepare JDL to select CE with a close SE where
  the executable is available
• Copy executable to WN
• Run and produce ntuple
• Copy ntuple to close SE and register to RC
• The aim is to reproduce this procedure using
  LCG-1

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Simulation Production (SP)

• Monte Carlo runs at 25 sites
• Includes all Tier-As
• Generate three times the hadronic rate
• MC Data is largest part of computing resources
• Generation, analysis, disk/tape, ...
• Managed centrally
• Allocations, modes, luminosity weighting

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BaBarGrid MC Production

• MC production system already tested on EDG v
  1.4.x ported to LCG-1
• BaBar MonteCarlo Production rpm is already
  included in Grid.it distribution
• First tests started ( in Ferrara, Padova,
  Legnaro, Milano, Trieste, Napoli, Bologna, Bari
  and Catania).
• Genius is migrating to the new release with a
  basic set of services for MC

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Future Plans

• 11/2003 Genius running under LCG-1 with a more
  complete set of services for MC production
• 12/2003 MonteCarlo Simulation Grid in
  production in a few sites
• Objectivity federations accessible in different
  sites
• 01/2004 A full scale analysis running on Grid
  and producing physics results (10000 8 hour CPU
  jobs producing 500 GB of output)
• New security method being deployed at SLAC in
  next few months (Virtual Smart Cards)
• 02/2004 LCG-1 deployed at SLAC
• BaBar RB installed at Ferrara
• 02/2004 MC in production in a larger number of
  site
• Analysis package tested and ready
• Increasing in BaBarGrid resources
• RC integrated with the BaBar book-keeping system
  (discussion in progress)