BaBarGrid GridPP10 Meeting CERN June 3 rd 2004 Roger Barlow Manchester University 1: Simulation 2: Data Distribution: The SRB 3: Distributed Analysis

BaBarGrid: GridPP10, CERN June3 2004Slide 2 / 16 1: Grid based simulation (Fergus Wilson + Co.) Using existing UK farms (80 CPUs) Dedicated process at RAL merging output and sending to SLAC Use VDT Globus rather than LCG –Why? Installation difficulty/Reliability/stability problems. –VDT Globus is subset of LCG: running on LCG system perfectly possible (in principle) –US groups talk of using GRID3. VDT Globus is also a subset of GRID3 – but GRID3 and LCG different. Mistake to rely on LCG features?

BaBarGrid: GridPP10, CERN June3 2004Slide 3 / 16 Current situation 5 Million events in official production since 7th March. Best week (so far!) 1.6 million events. Now producing at RHUL & Bristol. Manchester & Liverpool in ~2 weeks. Then QMUL & Brunel. 4 farms will produce 3-4 million a week. Sites cooperative (need to install BaBar Conditions Database which uses Objectivity) Major problem has been firewalls. Complicated interaction with all the communication and ports. Identifying the source has been hard.

BaBarGrid: GridPP10, CERN June3 2004Slide 4 / 16 What the others are doing Italians and Germans going full-blown LCG route Objectivity database through networked ams servers (need 1 server per ~30 processes) Otherwise assume BaBar environment available at remote hosts Our approaches will converge one day Meanwhile, they will try sending jobs to RAL, we will try sending jobs to Ferrara.

BaBarGrid: GridPP10, CERN June3 2004Slide 5 / 16 Future Keep production running. Test an LCG interface (RAL? Ferrara? Manchester Tier 2?) when we have the manpower. Will give more functionality and stability in the long-term. Smooth and streamline process

SLAC/BaBar Richard P. Mount SLAC May 20, : Data Distribution and The SRB

BaBarGrid: GridPP10, CERN June3 2004Slide 7 / 16 Client Disk Server Tape Server SLAC-BaBar Computing Fabric IP Network (Cisco) 120 dual/quad CPU Sun/Solaris 400 TB Sun FibreChannel RAID arrays 1500 dual CPU Linux 900 single CPU Sun/Solaris 25 dual CPU Sun/Solaris 40 STK 9940B 6 STK 9840A 6 STK Powderhorn over 1 PB of data Objectivity/DB object database + HEP-specific ROOT software (Xrootd) HPSS + SLAC enhancements to Objectivity and ROOT server code

BaBarGrid: GridPP10, CERN June3 2004Slide 8 / 16 BaBar Tier-A Centers A component of the Fall 2000 BaBar Computing Model Offer resources at the disposal of BaBar; Each provides tens of percent of total BaBar computing/analysis need; –50% of BaBar computing investment was in Europe in 2002, 2003 CCIN2P3, Lyon, France in operation for 3+ years; RAL, UK in operation for 2+ years INFN-Padova, Italy in operation for 2 years GridKA, Karlsruhe, Germany in operation for 1 year.

BaBarGrid: GridPP10, CERN June3 2004Slide 9 / 16 SLAC-PPDG Grid Team Richard Mount10%PI Bob Cowles10%Strategy and Security Adil Hasan50%BaBar Data Mgmt Andy Hanushevsky20%Xrootd, Security … Matteo Melani80%New hire Wilko Kroeger100%SRB data distribution Booker Bense80%Grid software installation Post Doc50%BaBar - OSG

BaBarGrid: GridPP10, CERN June3 2004Slide 10 / 16 Network/Grid Traffic

BaBarGrid: GridPP10, CERN June3 2004Slide 11 / 16 SLAC-BaBar-OSG BaBar-US has been: –Very successful in deploying Grid data distribution (SRB US-Europe) –Far behind BaBar-Europe in deploying Grid job execution (in production for simulation) SLAC-BaBar-OSG plan –Focus on achieving massive simulation production in US within 12 months –make 1000 SLAC processors part of OSG –Run BaBar simulation on SLAC and non-SLAC OSG resources

BaBarGrid: GridPP10, CERN June3 2004Slide 12 / 16 3: Distributed Analysis At GridPP9: Good news: Basic grid job submission system deployed and working (Alibaba / Gsub) with GANGA portal Bad news: Low take up because of Users uninterested Poor reliability

BaBarGrid: GridPP10, CERN June3 2004Slide 13 / 16 Since then… Janusz Improve portal Develop web-based version Alessandra Move to Tier 2 system manager post James Starts June 14 th Attended GridPP10 meeting Mike Give talk at IoP parallel session Write Abstract (accepted) for All Hands meeting Write Thesis Roger Submit Proforma 3 Complete quarterly progress report Revise Proforma 3 Advertise and recruit replacement post Negotiate on revised Proforma 3 Write Abstract (pending) for CHEP Submit JeSRP-1 Write contribution for J Phys G Grid article

BaBarGrid: GridPP10, CERN June3 2004Slide 14 / 16 Future two-point plan(1) James to review/revise/relaunch job submission system Work with UK Grid/SP team (short term) and Italian/German LCG system (long term) Improve reliability through core team of users on development system

BaBarGrid: GridPP10, CERN June3 2004Slide 15 / 16 Future two-point plan (2) RAL CPUs very heavily loaded by BaBar. Slow turnround stressed users Make significant CPU resources available to BaBar users only through the Grid Some of the new Tier 1/A resources All the Tier 2 (Manchester) resources And see that Grid certificate take-up grow! Drive Grid usage through incentive

BaBarGrid: GridPP10, CERN June3 2004Slide 16 / 16 Final Word Our problems today will be your problems tomorrow challenges