bosilca

There are many things to answer here, but first if you want to use TCP you should definitively not use `--mca btl ^tcp` or you will be unable to communicate...

The OMPI layer having access to the same information I wonder why delegating the vendor discovery to another software component (PMIx in this instance) is a good approach ?

Instead of adding another decision layer we can provide more flexibility/responsibility to the developers of the network support to select the set of components that make sense on their specific...

In same cases modifying the source code of an application/library is not an option, and being able to alter the behavior of the MPI library remains a critical capability. Among...

I checked the sessions requirements, and I think this will affect the sessions in the same way it affects the MPI_COMM_WORLD model, aka. by enforcing a selectable thread-level.

Basically, the BTLs are used by the OB1 PML, while the UCX net devices are used by the UCX PML. The OMPI current default being UCX (where supported), any change...

This is indeed a message from the TCP BTL, which seems to indicate your run did not use the UCX PML but instead rely on the OB1 PML. The results...

You don't need to list them all, just list the ones that have a unique physical backend (assuming there is no QoS installed on the interfaces that would limit the...

Technically yes, but this is not completely over yet for UCC and HCOL. In open-mpi/ompi#12429 I have not removed the attribute on `MPI_COMM_WORLD` that both libraries are using to detect...

The check for AVX512 was generating instructions that did not exists in some older architectures. We can't assume what hardware capabilities the libraries we call can handle, this check should...