[OMPI users] MX MPI latency measurements

[Maestas, Christopher Daniel]

With 2 nodes using 1.1.7 with the patch we measured (using mpich-mx
1.2.7..4):
        3.07us

With mx 1.2.1-rc18 we measure:
        3.69 us
And with mpich-mx 1.2.7..4 we see:
        3.20us

Our Open MPI settings:
---
# env | grep OMPI
OMPI_MCA_pml=cm
OMPI_MCA_mpi_keep_hostnames=1
OMPI_MCA_oob_tcp_include=eth0
OMPI_MCA_btl=mx,sm,self

Does anyone know why the latency would be slightly higher using Open MPI
versus MPICH-MX?

Thanks,
-cdm