How to Use OpenMPI-4 instead of OpenMPI-2.1.1 ?

[glanzkaiser]

Hi all,

I install OpenMPI-4.1.4, and I want to delete the OpenMPI-2.1.1 from OpenFOAM-9 but when I type: mpicc --showme it still look for configuration file from OpenMPI-2.1.1 / mpicc --showme still pointing to OpenMPI 2

even if I have two OpenMPI (version 4 and 2) installation.

The most problematic is when trying "Hello World" for MPI:

1. Works when using OpenMPI-2.1.1
2. Not working with any OpenMPI version 4

OpenMPI-4 is superseeded by OpenMPI-2.1.1 from OpenFOAM-9 ThirdParty libraries.

How to make sure the command for mpicc mpiCC mpirun to look only at the installed path of OpenMPI-4.1.4 ?

Can OpenFOAM-9 use OpenMPI-4 instead of OpenMPI-2.1.1?

Thank You