Settle on the MPICH Support for Native Khiops Core Linux Packages

[popescu-v]

Description

Currently, MPICH support for native khiops-core Linux packages it is accommodated for in the CMake-based build infrastructure, but native packages built with MPICH are not being released.

On the other hand, following PR https://github.com/KhiopsML/khiops/pull/537, we might need to specify if and how MPICH could be used in distributed environments with the native Khiops core packages.

Questions/Ideas

• the -n flag specifying the total number of processes is mandatory for MPICH. However, on distributed environments, this number can be difficult to obtain. The current solution, based on the _khiopsgetprocnumber executable, would only give the number of physical cores on the host mpiexec is launched on.

Context

• Khiops version: any
• OS description (use khiops -s): Linux