Getting Environment Variables Used by MPI application

[abeltre1]

Background Information

1. Open MPI Version: v5.0.0
2. Installation Method: Installed using a tarball
3. System Description:
4. Operating System/Version: Ubuntu Linux 22.04

Details of the Problem

I would like to know how to capture all the environment variables associated with an MPI application run. Specifically, is there an Open MPI variable that captures all the environment variables used to run the MPI application?

If there are specific commands or methods to retrieve these variables, please provide examples.

[jsquyres]

Are you asking from the perspective of the MPI application itself? If so, you can just use the C environ global variable to get all the environment variables and their values.