Porting of the Global-Workflow to Gaea-C5

Working closely with NOAA’s Environmental Modeling Center, the Earth Prediction Innovation Center’s (EPIC) Atmospheric Rivers’ team is leading the porting of the global-workflow (GW) to Gaea’s C5 partition. The C5 partition consists of 8 login nodes connected to 1,920 compute nodes with 128 cores/node each and a total of 449 TB of memory. This resource capacity at least matches and exceeds the capacity of other NOAA RDHPCS’s in most metrics and provides an environment for porting, testing, and running high-resolution GW configurations. Global-workflow is the end-to-end workflow designed to run global configurations of medium range weather forecasts for the UFS weather model. It supports both development and operational implementations. In general, porting includes data input staging, software to build and run GW, and multiple GW submodule ports. On the Gaea C5 partition, GW’s fixed, initial condition, and observation inputs are staged in a world-shared directory, which allows access for all other users outside of EPIC. Spack-stack is the software package currently used to build and run GW, which has been ported to Gaea C5 by EPIC’s software integration team. Submodule porting of the GW includes building executables for (1) UFS-utilities, GFS-utilities, Unified Post Processor, and the UFS-weather-model for forecast-only runs, i.e., no data assimilation (DA), (2) Gridpoint Statistical Interpolation (GSI), GSI-utilities, and GSI-Monitor for atmospheric DA, and (3) Global Data Assimilation System Application for coupled DA. All submodules have been successfully built and merged into the GW for Gaea C5, and test runs have been conducted including atmosphere-only forecast runs at C48, C96, and C384 and coupled (atmosphere-ocean-ice-wave) runs at C48. EPIC is currently working on porting the atmospheric-DA system (GSI) to Gaea C5 and will then continue with the coupled-DA system (GDAS) and higher resolution runs.