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Spack-stack enables the installation of software required for HPC system deployments of NOAA's Unified Forecast System (UFS) and other weather and climate models, including components of the Joint Effort for Data assimilation Integration (JEDI).

Spack-stack is a collaborative effort between:

• NOAA Environmental Modeling Center (EMC)
• UCAR Joint Center for Satellite Data Assimilation (JCSDA)
• Earth Prediction Innovation Center (EPIC).

Spack-stack is a thin layer around a fork of the spack repository. Spack is a community-supported, multi-platform, Python-based package manager originally developed by the Lawrence Livermore National Laboratory (LLNL). Spack is provided as a submodule to spack-stack so that a stable version can be referenced. For more information about spack see the LLNL project page for spack and the spack documentation.

The stack can be installed on a range of platforms, from Linux and macOS laptops to HPC systems, and comes pre-configured for many systems. Users can install the necessary packages for a particular application and later add the missing packages for another application without having to rebuild the entire stack.

spack-stack is mainly a collection of Spack configuration files, but provides a Spack extension to simplify the installation process:

• spack stack create is provided to copy common, site-specific, and application-specific configuration files into a coherent Spack environment and to create container recipes

• spack stack setup-meta-modules creates compiler, MPI and Python meta-modules for a convenient setup of a user environment using modules (lua and tcl)

Documentation for installing and using spack-stack can be found here: https://spack-stack.readthedocs.io/en/latest/

spack-stack is maintained by:

• Alex Richert, Hang Lei, Ed Hartnett NOAA-EMC

• Dom Heinzeller, JCSDA

For more information about the organization of the spack-stack project, see the Project Charter.

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