Re: [OMPI users] MX MPI latency measurements

[George Bosilca]

Which one is the latency with Open MPI ? Which version of Open MPI ?



  Thanks,
    george.

On Jun 6, 2007, at 12:26 PM, Maestas, Christopher Daniel wrote:

You might want to use OMPI_MCA_btl=mx,self to see if it makes any difference.

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


versus MPICH-MX?

Thanks,
-cdm


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Does anyone know why the latency would be slightly higher using Open MPI

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