Deutscher Wetterdienst COSMO-Standards for Source Code Development A Discussion COSMO Working Group 6: Reference Version and Implementation Working Group Coordinator: Ulrich Schättler

COSMO General Meeting Contents  What are we talking about / What should we discuss?  Software Design  Coding Rules  Interfaces  Implementation Issues  Documentation  Software Maintenance  Release Planning

COSMO General Meeting What are we talking about / discussing?  We should give some rules / guidelines / conventions for  writing (Fortran) source code  document the code  but also document the work  We have to give some rules for the maintenance of the programs  What else can you think of?  Can we give some ideas to STC during this week?

COSMO General Meeting Software Design  Splitting in program units  Common meteorological utilities library  Error handling

COSMO General Meeting Coding Rules  Style rules to give the code a common look  What about the rules given in the „COSMO-Standards“ draft?

COSMO General Meeting Interfaces  Do we have to specify, how interfaces should look like?  Which interfaces do we mean?

COSMO General Meeting Implementation Issues  Parallelization  Optimization  Vectorization

COSMO General Meeting Documentation  Model Documentation  Scientific, User Guides, Implementation Documentation  Process Documentation  Change Log, Release Planning  Bug Tracker

COSMO General Meeting Software Maintenance  Release Planning  Changes to the Reference Version  Rationale  Categories of changes  Procedure to follow  Committees to decide  Testing

COSMO General Meeting Release Planning  List of outstanding changes  Release counting  versions, releases  x.y or x.y.z  Bug Tracker

COSMO General Meeting Plans for the Near Future Technical WorkStatus Reconstruction of mpe_ioPrototype available Implementation of ifdefs for external librariesnot started Choice of output format for every Namelist groupnot started Implementation of grib_apistarted for INT2LM New Physics InterfacePrototype for Microphysics Semi-Technical COSMO-ART for Runge-Kuttaunder development 2-moment Microphysicsunder development Generic treatment of idealized casesunder development Implementation of generic tracer variablesneeds coordination Tile / Mosaic approachprototype available; definition of fluxes? Full 3D strang splittingimplemented at MCH; should be discussed in WG2 OASISprototype for OASIS 3.0; new work for 4.0 Urban Moduletechnical difficulties

COSMO General Meeting Thank you very much for your attention