draft agenda for wg meeting, friday 25 feb,1400,160-1-009
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25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
Draft Agenda for WG meeting, Friday 25 Feb,1400,160-1-009
• Review questions regarding computing model and resources ( first discussion
on our answers) F Harris et al
• Information on GRID EU proposal F Harris
• Update on UK status for LHC computing planning T Bowcock
• Update on other LHCb countries (Germany,France, Italy,.....) (country reps)
• Summary of work needed by WG for the review (summary agreement)
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
Tasks for LHCb Computing Model Review
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
Computer Model WG
• Country reps
– Brazil P Colrain(CERN)
– CERN J Harvey(CERN)
– France A Tsaregorodtsev(Marseille)
– Germany M Schmelling(MPI Heid)
– Italy D Galli(Bologna)
– Holland M Merk(NIKHEF)
– Poland M Witek(Cracow)
– Russia I Belyaev(ITEP)
– Spain J Saborido(Santiago)
– Switzerland P Bartalini(Lausanne)
– UK A Halley(Glasgow) T Bowcock will also act on WG (MC Farm)
• Computing group– J Harvey(resources),G Corti(Analysis),M Cattaneo(Reconstruction),M Frank(Databases etc.),
F Ranjard(Simulation),T Cass(IT),F Harris(raw+L2/L3+countries)
• + Anyone who is interested and prepared to help!
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
Overview of Talk /Discussion
• The questions from Computing Review
• The LHCb data flow model and relationship to MONARC
• A possible ‘tier’ model for LHCb( a la MONARC)
• Spreadsheets for defining our requirements - design and responsibilities
• A current view of a possible LHCb model - some key parameters
• Urgent jobs for country representatives
• SUMMARY of tasks and timescales
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
The questions posed by the Panel
• What is LHCb Model with respect to MONARC generic model?
• Current thinking re regional centres distribution
• LHCb plans vs. country plans - show consistency
• LHCb and GRID proposals - how , if at all, are we involved
• What are our requirements for storage, processing, communications from now to 2005+, and how will they be satisfied (distribution of tasks in centres)?
• Resource planning from now to 2005+
• Mock data challenges and test-beds?
• Magnetic Tapes vs. Disks (what is our thinking?…)
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
Some MONARC terminology for Datasets
• Datasets
ESD (Event Summary Data) Output from reconstruction (~ 100 kbyte)cp. Mini-DST
AOD (Analysis Object Data) Basic data for analysis -derived from ESD by Group Analysiscp. Micro-DST (~10 kByte)
DFD(Derived Data) Something smaller than AOD!
TAG Identify event by its physics signature (bits for physics channels or overall event characteristics (~1 kbyte)
cp. Nano-DST
LHCb Computing Logical Dataflow Model
Physics Generator
Detector Simulation
Generator Data
Simulated Raw Data
Monte Carlo
Raw Data
DAQ system
L2/L3 Trigger
Calibration System
Calibration Data
Reconstruction
ESD Event Tags
Raw Data Calibration Data
Group Analysis
Event Summary Data(ESD)
Event Tags
Analysis Object Data(AOD) Group Analysis Tags
Physics Analysis
Ntuples
Analysis Workstation
Physics results
Detector Analysis Cycle
Trigger Tags
Event Tags
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
MONARC terminology for Tiers• TIER-0 CERN (acts also as TIER-1) Stores all master copies and
does first reconstruction + all or part of re-reconstructions
• TIER-1 large RC on national scale (20% of scale of CERN centre). Can do all functions (e.g. share in re-reconstruction).
• TIER-2 Smaller RC. Essentially dedicated to analysis.
• TIER-3 Institute workgroup servers (for analysis)
• TIER-4 Desktop
COMMENT
TIER-0 and TIER-4 will definitely exist. Combinations of -1,-2,-3 are a matter of system design according to local constraints
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
The MONARC RC Topology CERN – Tier 0
MONARC report: http://home.cern.ch/~barone/monarc/RCArchitecture.html
Tier 1 FNALRAL
IN2P3622 M
bps2.5 Gbps
622 M
bp
s
155
mbp
s 155 mbps
Tier2 Lab a
Uni b Lab c
Uni n
Department
Desktop
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
More realistically - a Grid Topology
CERN – Tier 0
Tier 1 FNALRAL
IN2P3622 M
bps2.5 Gbps
622 M
bp
s
155
mbp
s 155 mbps
Tier2 Lab a
Uni b Lab c
Uni n
Department
Desktop
DHL
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
Tier Facilities• Collaboration centre
– CPU farms
– mass storage
• Tier 1 centre
– 20% of collaboration centre
– CPU farms
– mass storage
– high speed WAN connection to CERN
• Tier 2 centre
– 20% of Tier 1
– CPU farms
– no mass storage
– medium speed WAN connection to CERN
• HEP institute
– local cpu and disk server
– desktop machines
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
Russia?
MONARC scheme applied to LHCb ( a possible model)
CERN
IN2P3 Lyon DRAL UKITALY?Tier 1
Tier 2/3 LiverpoolOxford Imperial
College
CollaborationCentre
HEP instituteDesktop
Germany?
622 Mbps
2.4 Gbps
Raw Data and L2/L3 (F Harris)
Raw data size and L2/L3 cpu timeUnit Cost
(kSFr) VELO ITrack OTrack RICH1RICH2 PRESH ECALHCALMuonL1Trig TotalNo of channelsEvent Size (kB)L2 cpu time (SI95 secs)L2 data generated (kB)L3 cpu time (SI95 secs)L3 data generated (kB)Total raw data generated/eventData flow rate @ 40kHz L1 (MB/s)Total L2 cpu power @ 40 kHz L1 (SI95)Total L3 cpu power @ 5 kHz L2 (SI95)
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
Calibration.(M Cattaneo)
Calibration data size and cpu timeUnit Cost
(kSFr) VELO ITrack OTrack RICH1RICH2 PRESH ECALHCALMuonL1Trig TotalNo of channelsEvent Size (kB)Calibration cpu time (SI95 secs)Calibration data stored (kB)Total cpu power @ 1 HzCalibration run frequency / dayTotal calibration data produced / year (GB)
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
Reconstruction (M Cattaneo)
Reconstruction data size and cpu timeUnit Cost
(kSFr) VELO ITrack OTrack RICH1RICH2 PRESH ECALHCALMuonL1Trig TotalRaw data size input (kB) 0 0 0 0 0 0 0 0 0 0 0Initialisation cpu time /event (SI95 secs)Algorithm cpu time / event (SI95 secs)ESD size output (kB)Event Tag data output (kB)Total cpu power @ n HzTotal ESD data produced / year (GB)Total tag data produced / year (MB)
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
Group Analysis (G Corti et al)
Group Analysis data size and cpu timeUnit Cost
(kSFr) B>pp B>JY Grp 3 Grp 4 Grp 5 Grp 6 Grp 7 Grp 8 Grp 9 Grp 10 Total
ESD data size input (kB)Event Tag data input (kB)Initialisation cpu time /event (SI95 secs)Algorithm cpu time / event (SI95 secs)AOD size output (kB)Analysis Tag data output (kB)Total cpu power @ n HzTotal AOD data produced / year (GB)Total analysis tag data produced / year (MB)
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
Physicist Analysis(G Corti et al)
Physicist Analysis data size and cpu time
Unit Cost (kSFr) B>pp B>JY Grp 3 Grp 4 Grp 5 Grp 6 Grp 7 Grp 8 Grp 9 Grp 10 Total
AOD data size input (kB) 0 0 0 0 0 0 0 0 0 0 0Raw data size input (kB)Calibration data size input (kB)Analysis tag data size input (kB)Event Tag data input (kB)Initialisation cpu time /event (SI95 secs)Algorithm cpu time / event (SI95 secs)ntuple size output (kB)Total number of physicists
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
Urgent Jobs for Country representatives(please treat as a priority activity)
• Read GRID proposal and discuss with country colleagues (where relevant contact country person signing e.g. France,Italy,CERN,Spain,NIKHEF,UK)
• Find out in general what planning is going on in country for providing LHC computing facilities
• Find out what current situation is for HEP computing in LHCb institutes and country– e.g. CPU,Storage, networking,s/w environment
• Liaise with WG on general LHCb model and how their institutes fit in to distribution of resources. Also physics analysis inputs will be very welcome!
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
Computing Model joblist (our presentation will be in period Mar 22-24)
• Agree on logical dataflow model…complete soon. (John,Frank, Gloria et al) Mar 1
• Agree structure of corresponding spreadsheets ( inputs from all please) Feb 29
• Collect numbers and complete the tables (provide Basic Requirements) Mar 6
• Document additional use cases for simulation, calibration, reconstruction, re-reconstruction, analysis
– input Marco, Gloria, Florence, …. Mar 10
(Frank, John,Themis+ Country reps)
• Using MONARC template, identify LHCb’s distribution of centres Mar 1
• Describe how these resources are used today (simulation and testbeam) Mar 10
• Produce a baseline model for how this will evolve for real data by 2005 Mar 10
• Determine what data storage, communications and CPU resources will be needed in centres Mar 10
• Describe plans for use of test beds and MDC’s to validate model and provide intermediate services between now and 2005. (? Who …) ??
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
How will we work ?(exchange of information etc.)
• WWW site under construction- details on Feb 28.. Will put all working docs
+ links to MONARC,GRID etc… (http://lhcb.cern.ch/computing/hoff-grid)
• For those at CERN lots of working coffees
• For those not at CERN will use WWW, Email (?maybe one video/phone conf) + hard chasing!
25 Feb 2000 F Harris Tasks for developing LHCb Computer Model
Overview of EU GRID proposal• http://nicewww.cern.ch/~les/grid/welcome.html GRID home page
• http://nicewww.cern.ch/~les/grid/reports.htm Draft proposal
• ‘Outline of a proposal for a Data-intensive Computational GRID Testbed’
K Bos(NIKHEF),F Etienne(IN2P3),E Fernandez(IFAE,Spain),F Gagliardi,H Hoffmann,L Robertson(CERN),F Ruggieri,M Mazzucato(INFN),G Vesztergombi(Hungary),R Middleton(RAL,UK)
• Aiming for formal submission by May 10
• Hoffmann et al have met with experiments. Result was that– Experiments asked for a response as to their attitude
– Agreed that proposal, if it goes ahead, must have experiments included in management somehow
• Project is to ‘develop and demonstrate an effective wide-area distributed computing fabric’. Needs resources - people and testbed. Development is essentially s/w(Middleware) and evaluation in testbeds and using GEANT European network
• So please read and find out how it relates to country activities (money, people, planning etc…)
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