User requirements and use-cases

JRA4 Face-to-Face Meeting – CERN16 June 2004

Paul Mealor, UCL

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Sources of information

• LCG:• Ian Bird (not really)

• NA4 people:• Frank Harris (HEP)

Nick Brook (LHCb) Roger Jones (Atlas) Dave Newbold (CMS)

• Johan Montagnat (Biomed)

• NA4 documents• Combined requirements from EDG• Biomedical requirements• They have use-cases, somewhere

• Peter Kunszt, Peter Clarke…• GHPN

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HEP use cases

• Based around replica management• Two main overview use-cases:

• User job submission Middleware? User requires a job to be done as quickly as possible

• Data reprocessing Operations? Middleware? Large number of jobs Time-limited data reprocessing Time-limited data transfer

• Probably also useful for Task 2 use-cases

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LCG Data Scheduler

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NA4 combined requirements

• Selection of requirements• R3.11 Data access cost estimation

Yes yes• R2.2 Parallel jobs execution

Requires MPI, can we do anything about this?• R2.4 Multiple data jobs

Lots of similar data sets Retrieved from the same place at the same time Summed costs alter the optimisation scenario

• R2.6 Interactive Jobs CLI, GUI, image manipulation, job steering? Need low RTT, low jitter, minimum BW? Time constrained – the user has to be there to use the job Data required for user’s sites, as well as for CE/SE sites Task 2 requirements, also

• R2.10 Job killing

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NA4 Biomedical use-cases

• Two pilot applications• GATE

• Monte-Carlo simulation• Based on GEANT4• Basically the same as HEP Monte-Carlo jobs

• GPCALMA• Automatic analysis of mammographs• Distributed data (mammographs stored at local hospitals)• Distributed analysis

Pretty much ordinary job submission• Interactive inspection

Could be interesting Images are only 10MB

• Plus• Content-based query of medical image databases• Remote interactive segmentation algorithm (2 updates / s)

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GHPN use-cases

• GGF Grid High Performance Networking Working Group• Mark Leese, Tiziana and I have been writing some use-

cases for them• Administrative interaction with monitoring systems• HEP job submission• Cost-estimation use-cases

• Aimed at API design• Still useful for us

• Continues in parallel with JRA4 work

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Future work

• NA4 open meeting• Much more info from HEP applications• Much more info from biomed pilot applications

• Questionnaire/requirements template• Fill in for current use-cases• Extend the questions