[OMPI users] What about MPI-3 shared memory features?

[Tom Rosmond]

Hello,

I have been looking into the MPI-3 extensions that added ways to do 
direct memory copying on multi-core 'nodes' that share memory. 
Architectures constructed from these nodes are universal now, so 
improved ways to exploit them are certainly needed.  However, it is my 
understanding that Open-MPI and other widely used MPI implementations, 
e.g. Intel, MPICH, use hardware locality to identify shared memory 
regions and do direct memory copies between processes in these cases, 
rather than network communication.  If this is the case, are there any 
additional advantages from explicit programming of memory copying using 
MPI-3 shared memory features?

T. Rosmond