Dr. Swamy N. Kandadai
Certified Sr. Consulting IT Specialist
HPC Benchmark Center
System & Technology Group, Poughkeepsie, NY
Phone:( 845) 433 -8429 (8-293) Fax:(845)432-9789
swamy_at_[hidden]
http://w3.ibm.com/sales/systems/benchmarks
----- Forwarded by Swamy Kandadai/Poughkeepsie/IBM on 06/23/2006 10:21 PM
-----
Swamy
Kandadai/Poughkee
psie/IBM To
users_at_[hidden]
06/23/2006 09:52 cc
PM
Subject
OpenMPI version 1.1
Hi:
I am trying to run OpenMPI on a couple of nodes. These nodes have several
interfaces: eth0 (which is a GigE),
eth1 (which is a GigE with Jumbo frames enabled), IpoIB, myr0 in addition
to loopback (l0).
I want to use exclusively eth1 and I am running with this option:
mpirun --mca btl_tcp_if_include eth1 -machinefile hf -np 2 IMB-MPI1
where IMB-MPI1 is the Intel message passing benchmark.
Different times, it has different behaviors:
I ran on one set of nodes and I got a typical GigE behavior (around 100
MB/s). On a different pairs of nodes
it is giving me the BW consistent with IpoIB (around 700 MB/s).
Can u help me what I am doing wrong? How can I force it to use eth1 on all
nodes?
I just built OpenMPI with the following option:
./configure --prefix=$BINDIR --disable-io-romio
Thanks
Swamy
Dr. Swamy N. Kandadai
Certified Sr. Consulting IT Specialist
HPC Benchmark Center
System & Technology Group, Poughkeepsie, NY
Phone:( 845) 433 -8429 (8-293) Fax:(845)432-9789
swamy_at_[hidden]
http://w3.ibm.com/sales/systems/benchmarks
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