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Extreme-scale Scientific Software Stack (E4S)

The Extreme-scale Scientific Software Stack (E4S) is a curated software stack from the Spack ecosystem that is continuously built and tested on several pre-exascale systems. E4S is composed of many open-source projects, including xSDK, dev-tools, math-libraries, compilers, and more. For a complete product list see E4S Product Dictionary.

E4S is shipped as a container (Docker, Singularity, Shifter, CharlieCloud), a buildcache, or a Spack manifest (spack.yaml). Currently, we focus on building E4S from source using a spack.yaml file provided by the E4S team from


We install as many packages from E4S provided in spack.yaml as possible. Some packages were intentionally skipped such as specs tied to develop branches or packages built for GPUs. Some additional packages couldn't be installed or had concretization issues with our base compiler.

Point of Contact

If you need help with E4S you can submit a ticket at If you want to raise issue with E4S team, please report them in the E4S Github project which will be triaged to the E4S team.

If you would like to see your package in E4S, please contact the E4S team:


Past Events

Title Date Links
E4S at DOE Facilities with Deep Dive at NERSC Oct 4th, 2021 Introduction to E4S
ECP Software Technology Overview
Software Deployment at Facilities