George,
Apologies for not saying what latency is with Open MPI. I've noted it below.
I don't know why turning off the sm feature would help launching 1ppn. I just
tried turning it off and it didn't make a difference.
-cdm
On Wed, 6 Jun 2007, George Bosilca wrote:
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
Open MPI 1.2.2
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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