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Task Working Group 1 2021

Monthly status update information on WG 1 planned tasks

Status
as planned, delayed, technical problems, other problems, completed

Task Estimated duration (months) Short description Started Status after 1 month Status after 2 months assigned staff
Port loldtur=.FALSE. to GPU for COSMO 1 New turbulence scheme unavailable on GPU, should be activated to improve stable boundary layer April Turbulence scheme is re-activated and tested for GPU Available in separate branch, will be merged into c2sm branch - completed Michael Jähn
Prefetching for NetCDF 2 Enable prefetching of BC for NetCDF too. So far prefetching only implemented for Grib May as planned merged into master - completed Jonas Jucker
Asynchronous NetCDF-IO for COSMO 2 Ensure robustness of asnychrous output for NetCDF July as planned completed Jonas Jucker
Restarts in single precision for COSMO 1 This task plans to implement all parts in COSMO to allow single precision restarts July done by U.Schättler from DWD completed none
Optimize Turbulence and Terra for GPU in ICON 1 Turbulence and terra are ported to GPU but are very slow, need to be profiled and adapted. July as planned   Jonas Jucker

Suggested tasks for 21/22

The detailed tasks list provides more information about some of the submitted tasks.

Task Estimated duration requested by group description Prioritization by core team
Optimize Turbulence and Terra for GPU in ICON 1 month MCH-APN Turbulence and terra are ported to GPU but are very slow, need to be profiled and adapted. A
Asynchronous NetCDF-IO for COSMO 2 months HyMet + AtmCirc Asynchronous IO for NetCDF is available, but not regularly tested. Therefore multiple bugs appear depending on the configuration. Ensuring robustness of the asynchronous IO is one goal of this tasks. Another subtask is to implement online compression of data provided by modern NetCDF libraries before writing data into COSMO. A
Restarts in single precision for COSMO 2 weeks AtmCirc Restarts are currently not supported in single precision, but an essential feature for longer simulation. This task plans to implement all parts in COSMO to allow single precision restarts A
Port LPI to GPU in ICON 1 month MCH-APN Port LPI to GPU using OpenACC directives. Note: LPI is similar as COSMO so the implementation in COSMO can be used as guideline B
Grib2 workflow for COSMO 1 month AtmCirc Establish a GRIB2 workflow on Piz Daint (int2lm,!COSMO and fieldextra) due to performance issues with the NetCDF format. This includes providing the knowledge about where to put GRIB-dictioniaries, a correct runtime environment or on how to add new grib-fields into COSMO suspended in favor for asynchronous NetCDF-IO for COSMO
Container for COSMO 2 -3 months HyMet This tasks aims towards an operational workflow for a containerized COSMO model on GPU. This includes in resolving remaining issues from the internal container study by Jonas Jucker and setting up a CI/CD pipeline to deploy it to interested research groups. suspended, but keep in touch with CSCS
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