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III Workshop sul Software e Calcolo Moderno

III Workshop sul Software e Calcolo Moderno. L'Architettura del software di ATLAS Presentata da Laura Perini - Milano. ATLAS Software.

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III Workshop sul Software e Calcolo Moderno

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  1. III Workshop sul Software e Calcolo Moderno L'Architettura del software di ATLAS Presentata da Laura Perini - Milano

  2. ATLAS Software • The ATLAS experiment has been involved until this Spring in a large amount of studies that have lead to the publication of the "ATLAS Detector and Physics Performance Technical Design Report" • The work needed to achieve all the results needed for this huge document has been performed using a consolidated version of the ATLAS software based mainly on Fortran code and GEANT3 simulated data • After completion of the TDR we are now in the position of starting the realization of the new software, based on OO technologies, which will bring us, in several steps, to the experiment start-up and data taking • To ease this transition process and assess the status of early developments, the ATLAS management has setup a Computing Review Committee, that has given its recommendations in February 1999 • Following those recommendations, a new structure, based on several software groups, has then been put in place, with the global aim of including all the previous expertise in the new software developments, as well as to attract people to work with the new OO techniques

  3. ATLAS Architecture • In June, an Architecture Task Force (ATF) group has been setup, with the mandate of " specifying the global architecture of ATLAS computing, in a way that provides a unified execution framework for data access, reconstruction, simulation, analysis and event display " • The taskforce has a composition taken from a large base in the collaboration " so as to ensure that the architecture will be one with broad support " • Hopefully, with its findings, the group will also provide an architecture which is the right one for the experiment... • This group has not yet provided a final report (which is due by the beginning of November), hence there is nothing definitive that can be stated today on what the architecture will look like • What can be reported here are the main issues that has been taken into account and addressed in this first part of the analysis and design process and the motivations behind

  4. To come up with its first design, the ATF has followed the Unified Software Development Process (USDP) of Booch, Rumbaugh and Jacobson (same as GEANT4), using the Unified Modelling Language (UML) to draw the necessary diagrams In the meetings, a certain number of issues have been considered, including e.g. Report and studies of other architectures, both for new generation experiments like CDF/ BaBar (AC++) and for future experiments like LHCb (Gaudi) Analysis and assessment of ATLAS specific needs and identification of most demanding areas for software development the roles of persistent and transient data the definition of the Event Data Model the Detector Model and its description the compatibility with the on-line Event Filter the languages and scripting the importance of prototyping work

  5. The development in analysis and design which is currently under study is use-case driven • The use-cases are based on the wishes and requirements of the ATLAS community, in particular the Detectors and Physics Communities • It is felt that this approach is the best suited to • convey the relevant information about new software strategies and development process to the large, non-expert world of ATLAS researchers • attract people to work on tasks that they have considered relevant and important, instead of imposing book-style exercises • The implementation of the ATLAS global architecture (namely the core software framework) will be carried on by a dedicated group, with the goal of having a functional system by June 2001

  6. Materiale di Background • Computing Action Plan: trasparenze presentate a ATLAS plenary di Giugno da Web ATLAS home page • Plenary: Agenda…. • ATF, QCG update: plenary di settembre stessa via in web…. • Physics TDR naturalmente: da Web home page...

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