Within the BTL code (and surely elsewhere), we can use those convenient
OPAL_PROC_ON_LOCAL_{NODE,SOCKET, ...} macros to figure out where another
endpoint is located compared to us.
The problem is that it only works when ORTE defines it. The NODE works
almost always since ORTE is always doing it. But for the NUMA, SOCKET,
or CORE to work, we need to use Open MPI binding/mapping capabilities.
If the process affinity was set with something else (custom scripts
using taskset, cpusets, ...), it doesn't work.
How hard do you think it would it be to detect the affinity and set
those flags using hwloc to figure out if we're on the same {SOCKET,
CORE, ...} ? Where would it be simpler to do this ?
Thanks.
Sylvain
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