Edgar Gabriel

@bosilca this is not consistent, comm(2) cannot think that it is alone in the communicator, while comm(0) and comm(1) think that it is part of their subgroup

Maybe we should do a 2-step process: first step is to add the simple solution that @bosilca suggested, and backport it to 5.0.x and 4.1.x. There is clearly value in...

I don't necessarily disagree with you @bosilca I would just caution that sometimes these decisions are not dominated by MPI requirements. In this particular instance, it was the compute performance...

I am happy to take any help @rhc54 , I couldn't find a solution on how to map 8 processes onto a group of 3 CCD, that is the first...

@bosilca does that mean that a process that does not fulfill this criteria (i.e. utilize that specific hardware resource type instance, and no other instance of the same hardware resource...

@rhc54 the output of hwloc-ls is listed above on the ticket, is that what you are looking for or do you need additional information?

> I need the actually topology file output - the XML output so I can use it as input to PRRTE. @rhc54 I pingged you on slack for that, thank...

@hppritcha @jsquyres could you please re-review this PR?

This is the potentially related issue: https://github.com/open-mpi/ompi/issues/12979 that I mentioned on the call

@StaticObserver can you please post the mpirun command line that you used? You mention in the title description that you see the issue without UCX. Open MPI 5.0.x without UCX...