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Code Block
$ mpirun -np 32 -npernode 1 -mca pml ucx -x UCX_NET_DEVICES=mlx5_0:1 -mca coll_hcoll_enable 0 osu_barrier -i 100000

# OSU MPI Barrier Latency Test v5.4.1
# Avg Latency(us)
             4.17

$ mpirun -np 32 -npernode 1 -mca pml ucx -x UCX_NET_DEVICES=mlx5_0:1 -mca coll_hcoll_enable 1 -x HCOLL_MAIN_IB=mlx5_0:1 osu_barrier -i 100000

# OSU MPI Barrier Latency Test v5.4.1
# Avg Latency(us)
             3.29

$ mpirun -np 32 -npernode 1 -mca pml ucx -x UCX_NET_DEVICES=mlx5_0:1 -mca coll_hcoll_enable 1 -x HCOLL_MAIN_IB=mlx5_0:1 -x HCOLL_ENABLE_SHARP=1 osu_barrier -i 100000

# OSU MPI Barrier Latency Test v5.4.1
# Avg Latency(us)
             1.64

Note: in above testing the first command runs osu_barrier without HCOLL, the second command runs it with HCOLL but without SHARP, the third command runs it with HCOLL and SHARP.

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