BaBar-Grid Status and Prospects

Eleonora Luppi Padova 16 ottobre 2003

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Distributed Computing

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Currently BaBar has a largely distributed computing system 5 Tier-A sites

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Sites that provide large resources for BaBar Resources agreed to via MoUs >20 Tier-C sites

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University sites Produce majority of BaBar Monte Carlo

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Motivation

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Three large analysis sites

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Would like to be more flexible too and use other sites

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Need way for users to automatically submit jobs that run where the data and cpu is available

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Also intend that GridKa is only available via grid technology Could reduce the manpower used to run Simulation Production

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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 RB: Resource Broker RC: Replica Catalogue SE: Storage Element WN: Worker Node VO: Virtual Organisation Also CE & SE Bristol CE &SE 1

Present Infrastructure

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SLAC

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will install LCG-1

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SLAC/SCS actively involved in security for Grid (PPDG and LCG) Karlsruhe

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LCG-1 User Interface installed and LCG-1 deployed France

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Still nothing released for users INFN

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LCG-1 installed in Ferrara (Grid.it)

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Genius interface developed under EDG 1.4.x is migrating to new release UK

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EDG 2.x installed. RB at Imperial College installed Imperial College will have a LCG-1 RB soon

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BaBarGrid Analysis

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Successful test using EDG v 1.4.x

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Prepare executable locally

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Copy executable to SE and register to RC Prepare JDL to select CE with a close SE where the executable is available

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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)

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Monte Carlo runs at 25 sites

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Includes all Tier-As Generate three times the hadronic rate MC Data is largest part of computing resources

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Generation, analysis, disk/tape, ...

Managed centrally

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Allocations, modes, luminosity weighting

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BaBarGrid MC Production

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MC production system already tested on EDG v 1.4.x ported to LCG-1

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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

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11/2003: Genius running under LCG-1 with a more complete set of services for MC production 12/2003:

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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)

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