The MEG Offline Project General Architecture Offline Organization Responsibilities Milestones PSI 2/7/2004Corrado Gatto INFN

Estimated Event Size and Storage Sizes – Raw data 1.2 MB/event – ESD 10 KB/event – AOD 2 KB/event – TAG or DPD1 KB/event Storage – Raw data 35 TByte – Reconstructed data 13 TByte – MC generated events 40 TByte – MC reconstructed events 25 TByte Assuming 10 9 generated MC events Scaling BABAR & KLOE by multiplicity DST

General Architecture: Guidelines Computing & data model: MONARC Completely based on ROOT Ensure high level of modularity (for easy of maintenance) Absence of code dependencies between different detector modules (to C++ header problems) The structure of every detector package is designed so that static parameters (like geometry and detector response parameters) are stored in distinct objects The data structure is build up as ROOT TTree-objects (Folders)

Data Access: ROOT + RDBMS Model histograms Calibrations Geometries Run/File Catalog Trees Event Store ROOT files Oracle MySQL

Offline Tasks Offline Framework: – ROOT Installation and Maintenance – Main program Implementation – Container Classes – Control Room User Interface (Run control, DQM, etc…) I/O Development: – Interface to DAQ – Distributed Computing (PROOF) – Interface to Tape – Data Challenges Database Development (Catalogue and Conditions): – Installation – Maintenance of constant – Interface Contribution to Event Display DQM – At sub-event level responsibility is of detector experts – Full event is responsibility of the Offline team Documentation

Offline Tasks 2 Offline Software Coordination: – DAQ Integration – Coordinate the work of detector software subgroups Reconstruction Calibration Alignment Geometry DB Histogramming – Montecarlo Integration Data Structure Geometry DB – Supervise the production of collaborating classes – Receive, test and commit the code from individual subgroups Computing Coordination: – Hardware/Software Installation – Users and queue coordination – Supervise Tier-0 and Tier- 1/2 computing facilities

Manpower Estimate

Responsibilities & Tasks Detector experts: – LXe: Giovanni, Shuei, Ryu – DC: Matthias (hit), Hajime (Pattern), Lecce – TC: Pavia/Genova – Trigger: Donato (Pisa)

Milestones Start-up: October 2004 Choice of the prototype Offline system: October 2004 Organize the reconstruction code. December 2004 – per subdetector (simulation, part of reconstruction) – central tasks (framework, global reconstruction, visualisation, geometry database …) Write down the Offline Structure (container classes, event class, etc…) : February 2005 MDC: 4 th quarter 2005 Keep the existing MC in the Geant3 framework. Form a panel to decide if and how to migrate to ROOT: 4 th quarter 2005