[OMPI users] Specifying GPU on mpi

[Erin Rasmussen]

I have multiple GPUs on a node in my cluster and am trying to run some 
benchmarks on the system. However, since my department is in research 
and has a job system set up, I can only take one GPU offline to test 
until I are sure I know what I are doing. My problem is trying to set up 
the mpirun command to specify a single GPU. I understand how to use 
mpirun to run programs on specific processors on different nodes, but 
the GPUs show up as devices and not processors. How do I set up my 
mpirun command to use a specific GPU, or is that even possible?