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From: George Bosilca (bosilca_at_[hidden])
Date: 2007-06-06 12:54:26


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

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

   Thanks,
     george.

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

> 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
>
>
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