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LHC Computing Grid Project - LCG

This document provides an overview of the LCG Project and its collaboration with LHC experiments, regional computing centers, and physics institutes to prepare and deploy a reliable computing environment for analyzing LHC data. It discusses the project organization, resource management, and the role of different boards and committees. The document also highlights the constraints and allocation of resources in the project.

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LHC Computing Grid Project - LCG

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  1. LCG LHC Computing Grid Project - LCG LHCC Review of Computing Resources in Experiments 2-4 September 2003 Les Robertson – LCG Project Leader CERN – European Organization for Nuclear Research Geneva, Switzerland les.robertson@cern.ch

  2. LHC Computing Grid Project • The LCG Project is a collaboration of – • The LHC experiments • The Regional Computing Centres • Physics institutes .. working together to prepare and deploy the computing environment that will be used by the experiments to analyse the LHC data • This includes support forapplications • provision of common tools, frameworks, environment, data persistency • .. and the development and operation of a computing service • exploiting the resources available to LHC experiments in computing centres, physics institutes and universities around the world • presenting this as a reliable, coherent environment for the experiments

  3. LHC Experiments Committee LHCC - Technical Review Computing Resources Review Board - C-RRB Project Overview Board - POB PEB – Project Execution Board Management of the project SC2 - Software & Computing Committee Requirements, Monitoring Applications CERN Fabric Grid Technology Grid Deployment LCG Project Organisation

  4. Software and Computing Committee (SC2) Sets the requirements Approves the strategy & workplan Monitors progress and adherence to the requirements Gets technical advice from short-lived focused RTAGs Project Execution Board (PEB) Manages the progress and direction of the project Negotiates milestones, schedule, deals with resource allocation Ensures conformance with SC2 recommendations Coordinates the work of Regional Centres Organises inter-project collaboration Requirements-Operation-Monitoring • PEB • prepares work-plans in response to requirements • quarterly report to the SC2 on milestones & resources • detailed ~quarterly report to SC2 by implementation area • SC2 • approves work-plan • reviews quarterly progress report and presents summary to “mini-POB”

  5. Project Execution Board Project Execution Board project leader, area managers, experiment delegates, SC2 & GDB chairs, major external projects, major resource suppliers Architects’ Forum Applications Area Manager Experiment Architects Computing Coordinators Grid Deployment Board experiment delegates, national regional centre delegates PEB deals directly with the Fabric and Grid Technology areas

  6. Human Resources – where do they come from? Managed by the project – quarterly reports, Computing RRB reports • Special contributions from funding agencies to the LCG project • CERN support staff in IT and EP Divisions • Experiment staff taking responsibilities in the applications area - Paid by CERN/EP or by other institutes Resources reported through the project • Staff providing computing services in Regional Centres Other resources • People funded by EU to work on related activities • e.g. middleware development • the future EGEE project that will fund service support staff in 70 different centres – most of them serving HEP Only the staff at CERN are reported by LCG to the C-RRB

  7. Constraints on Contributed Resources • Different funding agencies have different constraints on how these staff are selected and assigned • The Grid word is usually significant and often has been used to justify the original funding • In most cases the staff are selected by the funding agency • In many cases the funding agency also decides on the assignment • The UK PPARC contribution was the single largest and the most flexible – joint selection board, which also agreed on the assignments

  8. Current Resource Allocation

  9. Current Resources Funding Source Project Activity without Regional Centres, EDG

  10. Human Resources Consumed without Regional Centres, EDG

  11. LCG LCG Phase 1 - Commitments for Special Funding for People at CERN

  12. Resources committed for 1Q04 Resources in Regional Centres • Pledges for the beginning of 2004 – during the data challenges • Support for the grid service at each site • Operations, systems expertise, call centre • Numbers have to be refined – different standards used • Future quarterly reports will include these resources • EGEE funding will play an important role

  13. Summary • LCG – Experiments, Regional Centres, CERN • There is a formal process for agreeing requirements, monitoring progress • The Applications Area is ~45% of the activity – and experiments contribute significantly to this • The “special” funding runs out in 2005 • An important part of the project will be coordinating the computing resources in Regional Centres (including CERN) • I have more remarks on the project resources – for the discussion after Torre’s talk

  14. Phase 1+2 – Human Resources at CERN • Applications reqts. – simple extrapolation from current scope + ARDA – not a formal estimate • Original (2001) applications scope was much more restricted • Computing service line – constrained from 2006 on to agreed manpower profile of CERN-CC-2430 • But – CC-2430 profile is not fully funded • Does not include benefit from EGEE (2004-05) • Few remaining sources of LCG manpower

  15. Remarks • Funding for LCG has exploited • the reputation of HEP for building aggressive computing systems that work and do real work • opportunities as they emerged for funding of novel approaches to computing • LHC data handling as an early adopter of the Grid model for distributed computing • LCG provides a practical goal for the first attempt at an EU-funded research grid infrastructure – EGEE • that benefits 70 partners almost all of which have HEP connections • and also will provide a significant net benefit at CERN • So – we get a lot of our income because we do interesting computingHowever - in view of the staff shortages reported this week we should understand the costs of the minimum baseline solution • LCG does not have abundant resources as some speakers appear to suggest – • the special LCG funding runs out during 2005 • 140 FTE-years of computing support in the CERN plan for Phase 2 are not yet funded • The Common Applications programme is only there to help - with a clear process for agreeing on requirements, workplan and staffing

  16. Help for Experiments to adapt to the “Grid” • Alice 1.8 FTEs (Ganis, Masoni) • ATLAS 1 (Smirnova) • CMS 1 (Sciaba, Pfeiffer) • LHCb 0 • General – 1 (Harris – EDG WP8 manager) • Total 4.8 FTEs • Further 4 FTEs scheduled to come from EGEE

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