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Centri Regionali e Progetto GRID per ATLASItalia

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L. Perini Milano 6 Mar 2000. 1. Centri Regionali e Progetto GRID. per ATLAS-Italia. La situazione a oggi: decisioni, interesse, impegni, punti da chiarire ... – PowerPoint PPT presentation

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Title: Centri Regionali e Progetto GRID per ATLASItalia


1
Centri Regionali e Progetto GRIDper ATLAS-Italia
  • La situazione a oggi decisioni, interesse,
    impegni, punti da chiarire

2
Layout
  • RC model for ATLAS-Italy prototype phase
  • How we see the GRID project
  • What would we do with RC prototypes and GRID
    tools in 2001-2003 preliminary
  • Which effort we are willing to commit
    preliminary
  • Example of a possible plan for hardware
    installations in 2001-2003 with a first rough
    evaluation of costs very preliminary

3
RC Model for ATLAS-Italy
  • We propose for ATLAS a Tier-1 in Italy for LHC
    start-up
  • The baseline hypothesys for its implementation is
    to relay on existing Consorzi di Calcolo for
    the outsourcing of system-personnel and probably
    for h/w housing
  • No decision about Tier-2 is taken for the moment
    a Tier-1 and Tier-3 only model could satify ATLAS
    needs
  • We propose a prototyping phase based on two
    sites Milan and Rome, with leading role for Rome
  • ATLAS-Italy is not a priori against a single
    multi-experiment Tier-1 in Italy for LHC-start-up
    time

4
Motivations for a two site RC initial prototype
  • More efficient in using available INFN manpower
  • Natural way of stimulating competition between
    Consorzi
  • Better possibilities for GRID experimentation,
    both between the two sites and between the sites
    and the Institutes (future Tier-3)
  • Limited extra costs
  • No loss in functionality
  • if a very big single prototype required in 2003
    we could upgrade just one of the sites

5
The GRID project
  • ATLAS-Italy is interested in participating into
    the GRID project in its two sides EU and INFN
  • The development of middleware for
  • farm management, with efficient ODBMS multiple
    access
  • WAN management of data and workloads
  • ..
  • is needed for efficiently distributed LHC
    computing, and only some piece can probably be
    bought
  • Real-life prototypes are needed for providing
    feedback and granting the development gives
    usefull results

6
ATLAS workload for RC/GRID prototypes - 1
  • The applications in 1-2 years from now ( first
    year of prototype activity, starting in spring
    2001) can be defined with reasonable
    approximation, afterward only extrapolations
    (ATLAS milestones to be defined also)
  • Only the applications requiring the most heavy
    use of CPU and/or storage are discussed here. We
    have other applications very interesting for
    testing specific aspects of the distributed
    computing, but only the ones that now set the
    scale of the initial prototypes are considered
    here

7
ATLAS workload for RC/GRID prototypes - 2
  • GEANT3 simulation of single m events for L1L2
    trigger studies 5 107 muons, 109 SpecInt95
    sec, most needed by end 2001 (trigger TDR) ?500
    SI95 and 0.5 TB required
  • G3 simulation of single muon events in different
    physics channels for acceptance and efficiency
    studies, same timing and resources as above ?
    500 SI95 and 0.5 TB required
  • G3 simulation of background in muon trigger
    chambers 3 104 events, 5 108 SI95 sec,
    similar timing
  • ? 250
    SI95 and 0.2 TB required

8
ATLAS workload for RC/GRID prototypes - 3
  • GEANT4 simulation of QCD jets for background
    studies to b/t physics and to t id 106 Jets, 2
    1010 SI95 sec, 1 year time from mid 2001
    1500 SI95 and 1 TB required
  • Other applications, as EventFilter studies,
    GEANT4 simulation of calorimeter Test Beam
    results, Teast Beam analysis require smaller CPU
    power ( all together 10 of the sum of the four
    application above) and 0.1-0.3 TB
  • TOTAL preliminary NEEDS ? 3000 SpI95 and 3 TB

9
Manpower available - 1
  • Four different profiles of activity for people
    involved
  • GRID middleware development
  • system maintenance for the prototypes
  • adaptation, implementation and maintenance of
    experiment s/w
  • designing, testing and exploiting physics
    application in GRID environment
  • The last profile is a physicist, the fist two are
    computing professionals, often not devoted to a
    specific experiment, third one is whithin the
    experiment, somewhat in between
  • For ATLAS system work is outsourced in the
    following only developpers are treated separately

10
Manpower available - 2
  • Grid Developpers
  • Area of Rome 1 FTE
  • Naples 1 FTE
  • Milan 0.5 FTE
  • Genova 0.5? FTE
  • Lecce 0.5 FTE (contribution of
    Aloisios group)
  • These people are not typically
  • allocated to experiments, most
  • numbers above still need final
  • approval the actitude of Directors
  • is positive.
  • Physicists and software experts
  • Area of Rome 3 FTE
  • Naples 0.5 FTE
  • Milan 1.5 FTE
  • Genova 1 FTE
  • Pavia 1 FTE
  • Pisa 0.5? FTE
  • Lecce 1 FTE
  • ...

11
Manpower available - 3
  • A conservative evaluation based on the numbers of
    previous slide gives 10 FTE of which 3
    developpers
  • Participating have normally involvements 50 of
    their time.
  • Area of Rome Roma1 Roma2 Roma3 LNF

12
Example plan for protype building -1
  • 2001 2 (2000SI95 2 TB ENELspacesys.peopl
    e)
  • cost 910 2 ( 125 160 40
    30 100) Ml
  • 2002 2 ( 3 TB ENELspacesys.people)
  • cost 700 2 ( 175 175) Ml
  • 2003 2 (8kSI95 3 TB ENELspacesys.people)
  • cost 1350 2 ( 300 125 250 ) Ml
  • The final installation is 20kSI95 and 16TB
  • The global cost in 3 years is 3Gl, 1.8 h/w,
    0.35 power, 0.25 space, 0.6 sys.people

13
Example plan for protype building - 2
  • Assumed a factor 1.4 down/year in cost (RAID
    disk).
  • Tier3 have to be equipped too! Full funcionality
    everywhere critical point to test and implement
  • The ENELspacesys.people costs are preliminary
    estimates from CILEA, CASPUR is very similar
  • Extra cost due to the presence of 2 sites is
    100 Ml/year
  • Backup tape-system and LAN/WAN connection not in
  • The initial installation matches the application
    foreseen, an increase of a factor 4 in activity
    over 2 years is assumed...
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