User-Managed Software


The User-Managed Software (UMS) program defines a set of polices by which users of OLCF systems are granted the ability and responsibility to install, maintain, document, and support software packages intended for use by other general users on OLCF resources.


The UMS program is currently supported on Summit, Andes, and Spock.

To apply to the UMS program, fill out the application at: Select “User Managed Software Program” from the drop down menu to begin.

Currently Available User-Managed Software

Project Packages Point of Contact Information
gen007flux Flux Stephen Herbein (
stf010 flang Fady Ghanim (  
aph114 openPMD-api WarpX libEnsemble Ascent/Conduit Adios2 dev Axel Huebl (; Complex compiled python extension. Might be best to treat as a discrete python environment similar to IBM-WML-CE.
gen119 NVIDIA RAPIDS BlazingSQL Benjamin Hernandez (
ums013 Julia Valentin Churavy (


To access and use the UMS available on a system:

> module avail ums
--------------- /sw/summit/modulefiles/core ---------------

> module load ums
> module avail ums
--------------- /sw/summit/modulefiles/core ---------------
  ums/default (L)

------------- /sw/summit/modulefiles/ums/core -------------

If there are issues with a UMS provided product, you can find information in the module via:

> module show ums-abc123

help([[ABC software description (User Managed Software)

  The ABC123 UMS project provides this feature.


  Please direct all support questions and concerns regarding this software
  installation to one of the following:

     - Point of Contact: <UMS Project PI>
       - Email:  <UMS POC email>
       - GitHub: <if applicable>

    <URL to the project's documentation>
  whatis("UMS - ABC Software")


The OLCF UMS Policy is located in the “Accounts and Projects” section of this documentation here.

Writing UMS Modulefiles

The following directories will be created and made available for you to install software and modulefiles:

/sw/{{HOST}}/ums/{{PROJECT}}                     ## root prefix for installing builds
/sw/{{HOST}}/modulefiles/ums/{{PROJECT}}/Core    ## root prefix for installing modulefiles

The builds in /sw/{{HOST}}/ums/{{PROJECT}} can be organized as you see fit, but we ask that you try to document the layout and build procedures. For example, under the prefix directory, use one or more of the following to improve transparency of the build process:

  • keep an up-to-date README or changelog
  • keep configure and build logs in your project’s area
  • use spack or non-interactive build scripts kept in the prefix to deploy all packages
  • track changes to configurations or build-scripts in git

so that other people such as new developers and maintainers on your project as well as OLCF staff will have a clear understanding of how the builds have been configured and what their dependencies are should they need to take over maintaining the builds.

The structure of the modulefile tree is somewhat flexible. These directories will not be in the default $MODULEPATH. For general users to access them, they will first need to opt-in to using UMS software by loading the ums/default module, then the module for your UMS software project ums-{{PROJECT}} and finally one or more modulefiles that you have written for your software:

module load ums
module load ums-{{PROJECT}}
module avail

# To see modules your project provides:
ls $(module --redirect show ums-{{PROJECT}} | egrep "MODULEPATH.*$" | grep -o "/sw/[^\'\"]*")

The gateway module ums-{{PROJECT}} will add /sw/{{HOST}}/modulefiles/ums/{{PROJECT}}/Core to the $MODULEPATH. Any modulefiles you install under this directory will be available to users when they have loaded the gateway module. Modulefiles must be organized according to the following structure:


You may have as many modulefiles as you see fit, both in terms of <package_name> and <package_version>. However, it is imperative that /sw/{{HOST}}/modulefiles/ums/{{PROJECT}}/Core only have one level of subdirectories (<packageN_name>). Having subdirectories will alter the way LMOD searches for modulefiles globally and generally make LMOD’s behavior indeterminate. It is also recommended that you be careful with symlinks in the modulefile prefix. In particular, symlinks under /sw/{{HOST}}/modulefiles/ums/{{PROJECT}}/Core that refer back to /sw/{{HOST}}/modulefiles/ums/{{PROJECT}}/Core will cause LMOD to enter a recursive loop and be unable to display or load your modules correctly.

For further assistance please contact the OLCF at