Raymond,
In the case of UCX, you can
mpirun --mca pml_base_verbose 10 ...
If the pml/ucx component is used, then your app will run over UCX.
If the pml/ob1 component is used, then you can
mpirun --mca btl_base_verbose 10 ...
btl/self should be used for communications to itself.
if btl/uct is used for inter node communications, it means your job is
running over UCX.
fwiw, it seems the default is to use both btl/vader and btl/uct for
intra node communications.
Cheers,
Gilles
On 10/20/2019 6:28 AM, Raymond Muno via users wrote:
Is there a way to determine, at run time, as to what choices OpenMPI
made in terms of transports that are being utilized? We want to
verify we are running UCX over Infiniband.
I have two users, executing the identical code, with the same mpirun
options, getting vastly different execution times on the same cluster.
