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les robertson cernit 1


... physical properties (energies, charge, tracks, ... (weather forecasting, earth observation, modeling. and prediction of complex systems, earthquake) ... – PowerPoint PPT presentation

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Title: les robertson cernit 1

LHC Computing Grid Project - LCG
  • The LHC Computing Grid
  • First steps towards a
  • Global Computing Facility for Physics
  • PPARC Council Visit to CERN
  • 12 December 2003
  • Les Robertson LCG Project Leader
  • CERN European Organization for Nuclear Research
  • Geneva, Switzerland
  • les.robertson_at_cern.ch

The LHC Accelerator
This is reduced by online computers that filter
out around 100 good events per sec.
  • The LHC accelerator
  • the largest superconducting installation in the
  • 27 kilometres of magnets cooled to 300o C
  • colliding proton beams at an energy of 14 TeV

The accelerator generates 40 million particle
collisions (events) every second at the centre of
each of the four experiments detectors
15 PetaBytes/year
Which are recorded on disk and magnetic tape at
100-1,000 MegaBytes/sec
Accumulating a vast data base
Challenge 1 Data Volume
Data accumulating at 15 PetaBytes/year Recording,
management, processing
Challenge 2 Large, distributed community
Offline software effort 1000 person-years per
Software life span 20 years
5000 Physicists around the world
LHC data analysis
  • Reconstruction transform signals from the
    detector to physical properties (energies,
    charge, tracks, particles, ..)
  • Analysis Find collisions with similar features,
    use of complex algorithms to extract
    physics… Collective iterative discovery of
    hundreds of physicists professors and their
  • Simulation start from theory and detector
    characteristics and compute what detector should
    have seen

Challenge 3 Providing a mountain of CPUs
Calibration Reconstruction Simulation Analysis
For LHC computing, some 100 Million SPECint2000
are needed!
1 SPECint2000 0.1 SPECint95 1 CERN-unit 4
MIPS - a 3 GHz Pentium 4 has 1000 SPECint2000
Computing for LHC
Europe 267 institutes 4603 users Elsewhere
208 institutes 1632 users
Solution Connect scientific
computing centres into an
integrated computing grid
CERN has over 6,000 users from more than 450
institutes from around the world
-- uniting the computing resources of
particle physicists in the world!  
What do we mean by a Grid?
Interconnected Collaborating Computer Centres
?The virtual LHC Computing Centre
ATLAS Virtual Organisation
CMS Virtual Organisation
The LHC Computing Facility
  • The user ---
  • sees the image of a single cluster
  • does not need to know - where the data is
  • - where the
    processing capacity is
  • - how
    things are interconnected
  • - the
    details of the different hardware
  • and is not concerned by the differing policies
    of the
    equipment owners and managers

The Grid hides the complexity -- leaving
the user to concentrate on physics
Goal of the LHC Computing Grid Project
The Grid is just a tool towards achieving the goal
  • To prepare and deploy the computing environment
    to help the experiments analyse the data from
    the LHC detectors
  • Phase 1 2002-05 development of common
    applications, libraries, frameworks, prototyping
    of the environment, operation of a pilot
    computing service
  • Phase 2 2006-08 acquire, build and operate the
    LHC computing service

LHC Computing Grid Project - a Collaboration
  • Building and operating the LHC Grid involves a
    collaboration of
  • The physicists and computing specialists from the
    LHC experiment
  • The projects in the US and Europe that have been
    developing Grid middleware
  • The regional and national computing centres that
    provide resources for LHC
  • and usually also for other physics
    experiments and other sciences

Software Engineers
Service Providers
The Project Organisation
Applications Area Development environment Joint
projects Data management Distributed analysis
Middleware Area Provision of a base set of
grid middleware acquisition, development,
integration, testing, support
CERN Fabric Area Large cluster management Data
recording Cluster technology Networking Computing
service at CERN
Grid Deployment Area Establishing and managing
the Grid Service - Middleware certification,
security, operations, registration,
authorisation, accounting
Phase 1 2002-05 development of common software
prototyping and operation of a pilot computing
service Phase 2 2006-08 acquire, build and
operate the LHC computing service
Enabling Grids for e-Science in Europe
LCG Staff at CERN by source of funding
LCG Phase 1 - Commitments for Special Funding for
People at CERN
Project Leader Tony Doyle a.doyle_at_physics.gla.ac
High Energy Physics Leading and Leveraging Grid
Many national, regional Grid projects
-- GridPP(UK), INFN-grid(I), NorduGrid, Dutch
Grid, …
  • European projects

US projects
LCG Service Status
  • Middleware package components from
  • European DataGrid (EDG)
  • US (Globus, Condor, PPDG, GriPhyN) ? the Virtual
    Data Toolkit
  • Agreement reached on principles for registration
    and security
  • Rutherford Lab (UK) to provide the initial Grid
    Operations Centre
  • FZK (Karlsruhe) to operate the Call Centre
  • Service opened on 15 September 12 sites
  • Now 28 sites operational
  • Second software release scheduled for next week

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The Challenges of Grid Computing
Keep the expectations in line with reality!
  • Middleware maturity
  • Service quality standards ?? innovation
  • a second (or third) generation of middleware will
    be needed before LHC starts
  • Grid operation
  • There is not yet any significant experience to
    build on
  • Data migration
  • Replication, caching, security, policies
  • Collaboration
  • From computer centre empires to a federation
  • Consensus rather than control
  • International research networking
  • Security our biggest risk

EGEE Enabling Grids for E-science in Europe
  • EU 6th Framework Project
  • Create a Grid for European Science
  • Supporting many application domains with one
    large-scale infrastructure
  • Providing round-the-clock access to major
    computing resources, independent of geographic
  • Emphasis on grid deployment (rather than
  • Leverages national and regional Grid programmes
  • building on the results of existing projects
  • National Research Networks and the EU Research
    Network Backbone Geant

EGEE Partners
  • 70 institutions in 27 countries organised into
    regional federations
  • Starts from the European subset of the LCG
  • Joint EGEE-LCG middleware activity

Grid Applications for Science
  • Medical/Healthcare (imaging, diagnosis and
    treatment )
  • Bioinformatics (study of the human genome and
    proteome to understand genetic diseases)
  • Nanotechnology (design of new materials from the
    molecular scale)
  • Engineering (design optimization, simulation,
    failure analysis and remote Instrument access and
  • control)
  • Natural Resources and the Environment
  • (weather forecasting, earth observation, modeling
  • and prediction of complex systems, earthquake)

Key LCG goals for next 12 months
  • Integration in the experiments mainline software
    suites of the LCG common software tools, object
    persistency system, simulation framework
  • Major Data Challenges of the four experiments
    developing/validating the data analysis models
    using the LHC Grid ? establishing LCG as a
    reliable, available, high-capacity service
  • Demonstrate a base solution for LHC startup
  • Preparing a second generation of Grid middleware
  • Hardened, re-engineered
  • Forging a collaboration of EGEE with
    experiments, other sciences …. and similar US

The LHC Computing Grid Applying computer
science and computer engineering
to fundamental physics
research The nucleus of a Grid infrastructure
for science?
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