1. General requirements for BES III offline & EF selection software Weidong Li

2. 17/12/2003BES III Software Meeting2 Requirements on the framework  Framework architecture: flexibility, simplicity and robustness  Modular structure and dynamically loading software components at run-time  Control of data processing Allow to specify a sequence of algorithms Execution of algorithm might depend on the physics signature of each event  Capable of specifying the configuration for adjustable parameters e.g. through JobOption file  Framework utilities: histogram service, messaging service, particle property service, timing service, input/output service, etc.  Independent of the underlying database or I/O technology.  Support multiple languages, Fortran and C++  Support parallel processing at least in event level

3. 17/12/2003BES III Software Meeting3 requirements on reconstruction algorithms  The algorithm should be designed with the goal of modular structure. Break down a major reconstruction task into a reasonable number of components.  Algorithms should remain unchanged whatever is the source of the data they are running on: EF data, offline data, simulation data, test-beam data.  Any parameters that an algorithm has should be available by user and should be configurable using a standard method.  For Monte-Carlo events, navigation from reconstructed data to Monte-Carlo data should be easy.  The correct calibration constants should be automatically picked.

4. 17/12/2003BES III Software Meeting4 Requirements for Event Filter Selection Software (EFSSW)  Fast rejection to avoid unnecessary processing and to minimize the average decision latency.  Be able to change the selection strategy without rebuilding the software.  Both seeded and unseeded reconstructions should be supported.  Should be possible to specify a pre- scale factor for certain physics events like Bhabha or dimuon events.  Forced to accept a small fraction of events which otherwise would not pass for monitoring purpose.

5. 17/12/2003BES III Software Meeting5 Requirements for EFSSW (2)  EFSSW algorithm should be thread- safed for processing events in parallel threads.  The interface between the framework control and EF algorithms is desired to be independent of running environment (offline or online).

6. 17/12/2003BES III Software Meeting6 Running EFSSW in the offline environment  Development, testing and verification of EFSSW components  Determination and tuning of the performance in terms of selection efficiency, execution time and event rates based on simulation  Validation of the results and performance of the online system  Study trigger efficiency, acceptance and biases once real data are available

7. 17/12/2003BES III Software Meeting7 Requirements for Physics analysis  Be able to produce and save persistently histograms and ntuples for later analysis using a separate tool like PAW  be able to use any reconstruction routines in the analysis environment  Existing legacy FORTRAN code should be supported Telesis Particle selection and identification Secondary vertex finding dE/dx correction  single event display

8. 17/12/2003BES III Software Meeting8 Belle and Gaudi framework (1)  Gaudi architecture separates date from algorithmic code and provides standard software components for specialization: DataObject Algorithm Service Tool Converter  Control of data processing Path in Belle: the execution of modules is determined by Path and the conditional branch to another path is also supported. Gaudi supports algorithm sequences, filters and branches

9. 17/12/2003BES III Software Meeting9 Diagram for algorithm sequences and branches

10. 17/12/2003BES III Software Meeting10 Belle and Gaudi framework (2)  Data management Integral data management based on Panther (Belle) Belongs to blackboard family (Gaudi)  Gaudi supports Objectivity/DB Microsoft Access MySQL ORACLE  Gaudi supports muti-threaded application

11. 17/12/2003BES III Software Meeting11 Conclusions and open issue  The current BESF framework is in pretty good shape and should be regarded as the baseline solution for offline software.  But there are still difficulties to plug the offline algorithms in the online EF dataflow framework.  Shall we keep the choice of underlying framework open and make an effort to evaluate the feasibility of adopting Gaudi?