Summary of WG6 activities Massimo Milelli & all the group members 13/09/2017 – 19th COSMO General Meeting, Jerusalem

Outline Reporting NWP Test Suite PT EDP2 New PP Web updates New Italian configuration 13/09/2017 – 19th COSMO General Meeting, Jerusalem

Outline Reporting NWP Test Suite PT EDP2 New PP Web updates New Italian configuration 13/09/2017 – 19th COSMO General Meeting, Jerusalem

Reporting Newsletter: July 2017 (5 contributions) Technical Reports: A Turbulence Kinetic Energy - Scalar Variance Turbulence Parameterization Scheme, D. Mironov and E. Machulskaya (TR30) CALMO - Progress Report, P. Khain, I. Carmona, A. Voudouri, E. Avgoustoglou, J.-M. Bettems, F. Grazzini and P. Kaufmann (TR31) Calibration of COSMO Model, Priority Project CALMO Final report, A. Voudouri, P. Khain, I. Carmona, E. Avgoustoglou, J.M. Bettems, F. Grazzini, O. Bellprat, P. Kaufmann and E. Bucchignani (TR32) V.A.S.T. (Versus Additional Statistical Techniques) User Manual (v2.0), N. Vela (TR33) Common plot activity 2016-2017 TRs from PP CORSO, PP COTEKINO and PP KENDA are pending 13/09/2017 – 19th COSMO General Meeting, Jerusalem

Outline Reporting NWP Test Suite PT EDP2 New PP Web updates New Italian configuration 13/09/2017 – 19th COSMO General Meeting, Jerusalem

NWP Test Suite Forecast mode vs Hindcast mode MEC+FF vs VERSUS The discussion started via email some time ago, then during the STC meeting on Monday and it continued during the joint WG6/WG5 meeting. A conclusion is not yet reached, there will be a follow-up during SMC meeting on Friday morning. 13/09/2017 – 19th COSMO General Meeting, Jerusalem

Outline Reporting NWP Test Suite PT EDP2 New PP Web updates New Italian configuration 13/09/2017 – 19th COSMO General Meeting, Jerusalem

PT Evaluation of the Dycore Parallel Phase (EDP2) Task duration : 01/2017 – 08/2017 Two implementations of the RK dynamical core coexist in COSMO: Fortran C++ based on STELLA Library (required to run on GPU) C++ version will soon be in the official version (with 5.05) STELLA dycore is required to run the model on GPU, faster on CPU also Maintenance effort 0.5 FTE/year 13/09/2017 – 19th COSMO General Meeting, Jerusalem

Developer experience (using STELLA) C++ Dycore Source Code Maintainer (P. Spörri, MCH) : nice and efficient to write single source performance portable HPC code C++ Dycore Users: Experiences at DWD: very different than higher programming language (like Fortran, C++, Python, ...), need permanent support for development. => Seen as a large obstacle for model development Experience at IMGW (port of EULAG with GridTools): while this is early stage, progress is good and currently there are no major obstacles to port the Fortran code to C++. => Divergent opinions ! 13/09/2017 – 19th COSMO General Meeting, Jerusalem

Developer experience (using STELLA) Recommendation Extend the parallel phase of maintaining both the C++ and Fortran implementations Evaluate again after a period of at least two years C++ Dycore Source Code Maintainer (P. Spörri, MCH) : nice and efficient to write single source performance portable HPC code C++ Dycore Users: Experiences at DWD: very different than higher programming language (like Fortran, C++, Python, ...), need permanent support for development. => Seen as a large obstacle for model development Experience at IMGW (port of EULAG with GridTools): while this is early stage, progress is good and currently there are no major obstacles to port the Fortran code to C++. => Divergent opinions ! 13/09/2017 – 19th COSMO General Meeting, Jerusalem

Outline Reporting NWP Test Suite PT EDP2 New PP Web updates New Italian configuration 13/09/2017 – 19th COSMO General Meeting, Jerusalem

PP CEL-ACCEL There is a new WG6 PP about COSMO-EULAG on accelerators (PP CEL- ACCEL) by Z. Piotrowski. The aim is to implement consistent anelastic/compressible COSMO-EULAG dynamical core (DC) within the C++ dynamical core framework of COSMO (the main deliverable being the high-resolution forecasting system ready for pre-operational testing on modern supercomputing architectures, viz., GPU and manycore CPUs). The duration is 2.5y (03.17-09.19) and the participants are IMGW and MCH. 13/09/2017 – 19th COSMO General Meeting, Jerusalem

Outline Reporting NWP Test Suite PT EDP2 New PP Web updates New Italian configuration 13/09/2017 – 19th COSMO General Meeting, Jerusalem

Main web updates after the meeting in March Added filters to publication list (by year and by WG topic) Newly organised Software page New FTE summary tables for PPs and PTs In the main home menu (left side), under “Documentation/Release Notes” now the files misc.global are available (better visibility) PP pages and Events page updated PT pages added in the main home menu (left side) SMC repository added to the “User Support/Repository” page Info about licensees in “Operational” pages 13/09/2017 – 19th COSMO General Meeting, Jerusalem

Still to be done… There is an idea to include COSMO-LEPS maps Documentation of TERRA to be included (public wiki) but DWD internal discussion is still needed Need to update some “Operational” pages Comprehensive grib2 page Updating FAQ page 13/09/2017 – 19th COSMO General Meeting, Jerusalem

Outline Reporting NWP Test Suite PT EDP2 New PP Web updates New Italian configuration 13/09/2017 – 19th COSMO General Meeting, Jerusalem

13/09/2017 – 19th COSMO General Meeting, Jerusalem

Thanks for your attention and for your work ! 13/09/2017 – 19th COSMO General Meeting, Jerusalem