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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.

E4S Support Timeline

This table outlines the support lifetime for each E4S version. The Release Date is marked on the day of E4S release when user documentation was live. Once E4S version has reached end of support we will remove E4S and corresponding modulefiles and user documentation. As we approach the End of Support for a particular release, we will communicate via email and modulefile will include a banner when loading the module.

We recommend users to port their application and any scripts to the newer release.

System Version Release Date End of Support
Cori 20.10 Jan 15th 2021 Mar 16th 2022
Cori 21.02 Jun 11th 2021 Mar 16th 2022
Cori 21.05 Aug 23th 2021 Oct 31st 2022
Perlmutter 21.11 Jan 22nd 2022 Mar 31st 2023
Cori 22.02 Mar 16th 2022 End of Life Cori (2023)

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