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U.S. ATLAS Computing. Overview Status of ATLAS computing U.S. ATLAS Project Management Organization Status of efforts Core software Subsystems Facilities Schedule FY 00 funding request Summary. Scale of Computing Effort.
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U.S. ATLAS Computing • Overview • Status of ATLAS computing • U.S. ATLAS • Project Management Organization • Status of efforts • Core software • Subsystems • Facilities • Schedule • FY 00 funding request • Summary
Scale of Computing Effort • Rough scaling of factors of 5 to 1E+3 in relevant parameters from Tevatron Experiments • Manpower x5 • CPU/event x1E+3 (event complexity) • Data volume x10 to x1E+2 (channel count) • Distribution of data x10 • U.S. effort comparable to scale of Tevatron experiment. • Effort $15M/year
Goals for the next year • Project organization • Management • Identify areas of responsibility • Integration of efforts into ATLAS • Inception/development of software • U.S. support facilities • Planning/development of infrastructure • Prepare for reviews
International ATLAS • New Computing Coordinator • Norman McCubbin (RAL) • Available full time November • Approval vote - ATLAS CB June 10th • Responsibility: Core software • New Physics Coordinator • Fabiola Gianotti (CERN) • Approval vote - ATLAS CB June 10th • Detector specific sim/reconstruction • Organized within subsystems
Architecture Taskforce • Software partitioned into work packages • Katsuya Amako, KEK • Laurent Chevalier, CEA • Andrea Dell’Acqua, CERN • Fabiola Gianotti, CERN • Steve Haywood, RAL (Chair) • Jurgen Knobloch, CERN • Norman McCubbin, RAL • David Quarrie, LBL • R.D. Schaffer, LAL • Marjorie Shapiro, LBNL • Valerio Vercesi, Pavia
Architecture T.F. Status • Three meetings so far • Directions: • Language: C++ (allow for migration to other e.g. JAVA) • Examine GAUDI (LHCb) architecture • Adoption of “use cases” • Goals for October • Outline of architecture design • Appointment of Chief Architect • Commission work on prototyping of parts of design • Create use-cases, requirement document • Define packages and relations (package diagram)
Quality Control • Recommend software performance specifications, review process • Makoto Asai, Hiroshima • Dario Barberis, Genoa • Martine Bosman, Barcelona • Bob Jones, CERN • Jean-Francois LaPorte, CEA • Helge Meinhard, CERN • Maya Stavrianakou, CERN
Action on other Groups • National Board • Supported platforms • Regional centers • Training • Network of national contacts for training • C++, OO programming • GEANT 4 • ATLAS Specific
ATLAS/CERN Schedule ‘00 • Sept. ‘99 • Start of Cashmore/Hoffman review • Oct. ‘99 • Report of architecture T.F. • Commissioning of prototyping code • Jan ‘00 • Start preparations for bilateral agreements • Fall ‘00 • Report of Cashmore/Hoffman review • MOU preparations
U.S. Participation • Frank Paige - Co- convenor of SUSY working group • David Malon - Co-leader of database group • Craig Tull - Architecture Group • Ian Hinchliffe - Leader of Event Generator group • David Quarrie, Marjorie Shapiro - Architecture Task Force • John Parsons - Co-convenor of Top working group • Misha Leltchouk - L Ar simulation coordinator • Michael Shupe - Convenor of Background working group • Fred Luehring - TRT software coordinator • Steve Goldfarb - Muon Database Coordinator • Tom LeCompte - Tilecal Database Coordinator • Krzys Sliwa - Chair of ATLAS World-wide computing group • Frank Merritt - Training contact, Tilecal Reconstruction coord. • Bruce Gibbard - Regional center contact • John Huth- National Board contact
U.S. ATLAS Computing • NSF, DOE: LHC computing activities are now “projectized” • Implications for U.S. ATLAS: • Direct reporting lines through Project Manager (Bill Willis) and BNL Directorate (Tom Kirk) • Appointment of Associate Project Manager for Computing and Physics (John Huth) • Implications for Agencies: • Must clarify reporting lines, operations
Management Structure • Reflects flow of deliverables to, from ATLAS • Appointments (2 year renewable terms) • Physics: Ian Hinchliffe (LBNL) • Facilities: Bruce Gibbard (BNL) + deputy • Issues • Software manager • Availability within U.S. ATLAS - hire? • Flatter structure for the time being? • Bring on soon? Most desirable!
Management Plan • Associate Project Manager • Member of E.C. • Develop and execute project plan • Establish and maintain project organization+Tracking • Develop annual budget requests • Liason to ATLAS Computing Management • Appoint L2 managers • Review and approve MOU’s to CERN and Institutes • Exercise change control authority • Establish advisory committees where appropriate • Provide reports and organize reviews
Implications for APM • APM is a time consuming job. • Actions for John Huth: • Relief from MDT electronics coordinator (Jay Chapman, U. Michigan) • Relief from U.S. ATLAS Inst. Bd. Chair (Jim Siegrist, LBNL) • Teaching relief - spring terms ‘00 and ‘01 • Granted by Harvard University
Level 2 Managers • Appointed by APM, concurrance of Exec. Comm. • Members of E.C. (+ APM, + deputy) • Two year renewable terms • Generic responsibilities • Develop definition of milestones and deliverables • Define, with APM, organizational substructure of level 2 • Develop, with APM, annual budget proposals • Identify resource imbalances within subprojects and recommend adjustments • Deliver scope of subproject on time within budget • Maintain cost and schedule • Provide reports to APM, PM • Liason with counterparts at CERN
Specific Responsibilities • Physics Manager • Generators, physics objects, benchmark studies, mock data challenge • Software • Core • Detector specific sim/recon • Training • Facilities • Tier 1,2, networking, support
Project Engineer • Same roles as project engineer’s for construction project • Tracking • Reviews, oversight • Reporting • Technical input
Proposed Names • Physics: Ian Hinchliffe (LBNL) • Contacted, accepted • Policy question: physicists on project • Software: search underway • Facilities: Bruce Gibbard (+deputy) • Deputy: Jim Shank
Facilities Manager • Bruce Gibbard (BNL) • Proposal to add U.S. ATLAS Deputy • U.S. ATLAS and RHIC Deputies • General agreement with Bruce, Tom Kirk • Begin to fill in other areas • Networking • Tier 1 • Remote sites • Support
Detector Contacts • L Ar - Srini Rajagopalan (BNL) • Tilecal - Frank Merritt (U.Chicago) • ID- Laurent Vacavant (LBNL) • Muon - Bing Zhou (U. Michigan) • TRT - Keith Baker (Hampton) • Trigger/DAQ -Andy Lankford (UCI)
Planning Activities • Writing/preparation assignments for review - next week • L2 managers where appropriate (ie. Facilities, physics) • Core • Sim/recon • Training • Management (PMP for computing) • MRE/IT “team” • Review in October
WBS Structure • Should be flexible while project definition is underway (level 3+beyond) • Level 2’s should be fixed now • Commensurate with management structure • Adopt lead number “2”
High Levels of WBS • Draft WBS • 2.1 Physics • Generators, benchmarks, mock data challenges, physics objects • 2.2 Software • 2.2.1 Core • Control/Framework,database, event model, analysis tools • 2.2.2 Detector specific simulation and recon. • 2.2.3 Collaborative tools • 2.2.3 Training • 2.3 Facilities • Regional center, remote sites, networking, support
Near Term Activities/Issues • U.S. ATLAS Web-site • Weekly video conferences • Support role of BNL • Gathering FY 00 requests • Advisory group appointment • Writing assignments for proposal • NSF MRE/IT proposal - Tier 2 centers • Discussions of deliverables with ATLAS • Interactions with agencies • JOG, Computing review
Software • Core Software • Control/Framework (Tull) • Database, Tilecal Pilot Project (Malon) • Event Model (Rajagopalan) • Detector-specific sim/reconstruction • Representatives from subsystems chosen • Training (Merritt) • Establishment of OO courses (BNL, U. Chicago)
General Requirements • Software must last over lifetime of experiment, yet track language changes • Well defined interface layers • Maintainability, engineering critical • Number of users, use of software professionals • Adaptability to distributed environments • Learn from experiments working on OO (BaBar, D0, CDF, STAR)
Database • David Malon (ANL) • Tilecal pilot project • Tilecal testbeam data in object database • Testbed for ATLAS technologies and strategies • Early feedback to developers • Generalized to other subsystems • Database core software • Transient and persistent object mapping • Definition of database/control interface • Specifications • Examine alternatives to Objectivity
Database Milestones • Jan ‘00 • Survey of mapping strategies • Feb. ‘00 • Infrastructure for developers deployed • April ‘00 • Validation of strategies in testbed • July ‘00 • Database management infrastructure defined • Oct ‘00 • Infrastructure for distributed access deployed • Jan ‘01 • Scalability test • Oct ‘01 • Beta release
Control/Framework • Craig Tull (LBNL) • Working on user requirements document (w/ Hinchliffe, Shapiro, Vacavent) • Market survey of framework systems • Object component model • AC++ • Compatibility with ATLAS architecture • Resource loaded work plan exists • Work with A.T.F. for design requirements • Already have tested prototype designs
GUI Interface (eg. Tk, …) Scripting Interface (eg. Tcl, …) Command Marshalling (eg. SWIG, ...) Software Bus (eg. CORBA) Component Class Adatpers Component C++ Classes/Objects One Framework Model
Event Model • Type of objects that are stored • Client’s view of the event • Physical organization of the event • Client’s interface to the event • Mechanism to navigate between objects • Transient to Persistent Object mapping
Event Model Milestones • Nov. 99 • Review of models in other exp’s • Requirements documents • Dec. 99 • Resource loaded schedule • Mar. 00 • Baseline design • June 00 • Alpha release • Aug. 00 • Review experience • FY 01 • Beta release
Some Detector Activities • TRT/ID • Put full TRT simulation into GEANT4 • L-Ar • Coil, cryos in GEANT4 (Nevis) • Accordian structure in GEANT4 (BNL) • Tilecal • Pilot project
Some Detector Activities • Muon • Study of noise in Higgs-> 4 muon • Combined performance of ID+muon system (A reconstruction) • CSC into simulation • Trigger/DAQ • Comparison of switching architectures • Background studies • Optimization of shielding (100 MeV muon background)
Training • New paradigm of OO programming • Training courses (F. Merritt) • Course offered at BNL (near future) • Course offered at Chicago • Successful programs seen at other experiments (CDF, D0, BaBar) • Ongoing need for training throughout course of experiment • Documentation • ATLAS-specific
Software Development • Asymptotic level - est. 10 software professionals • Peak load (circa 2003) est. 16 S.P.’s • Extrapolations based on existing experiments and proposed areas of responsibility, fractional of U.S. participation • Choice of technology can influence actual needs strongly (e.g. BaBar, STAR in database)
Planned Training • All by Object Mentor (BaBar, others) • Organized by Frank Merritt • Courses approximately 1 week long • Aug. 9 - BNL - OO Design - 13 people • Sept. 20 - U.C. - OO Design - 15 people • Oct. 18 - ANL or BNL - Advanced OO - 10 people • Nov. 8 - FNAL - GEANT 4 - 14 people
Facilities • BNL ramping up support facility • Taps into RHIC Computing Facility • Major issue of Tier 1/2 facilities • Scale of “Tier 2’s” • Size for support staff, infrastructure • Computing model for U.S. (e.g. grids) • Being addressed in NSF MRE/IT proposal • In the process of developing policy on usage, support of platforms at institutions
Facilities • Tier 1 (Regional Center) • BNL • Leverages RCF • ATLAS specific needs, however. • Primary support function for U.S. • Code release, support • Major processing, event store • Personnel scale estimate: • Roughly linear ramp from 2 FTE’s (now) to 22 or more (depending on computing model)
MONARC • Models of Networked Architecture at Regional Centers (ATLAS+CMS) • Alexander Nazarenko, Tufts hire • Tasks: • Validate simulation models • Perform first simulations of LHC architectures • After Dec. ‘99, focus on planning for regional centers • Model validation - end of September • Understanding of U.S. computing facilities
NSF MRE/IT Proposal • Tier 2 centers • Approx. 5 total • 256 node systems • 100 TB tape system • Low maintenance • Linked by computing grid • Computing professionals • Dual role - user/developers
Review Process • Send proposals to Advisory Group (Aug. 4th) • Charge: • Identify areas of overlap/commonality • Suggest simplifications/savings • Coherency with ATLAS effort • Prioritize • Meet with Agencies to establish scale for FY 00, initial request (Now) • Confer with Advisory group on feedback • Prepare, review documentation for Dec. review (mid-late Sept.)