[OMPI users] Ethernet bonding and Open MPI

[Allan Menezes]

Hi,
 I have a 16 node AMD/P4 machine cluster running Oscar 4.2.1 Beta and 
FC4. Each machine has two Gigabit network cards. One being realtek8169 
all connected to a netgear GS116 gigabit switch with max MTU =1500 and 
the other NIC being aDlink Syskonnect chipset gigabit card connected to 
a managed NetgearGS724T Gigabit switch with Jumbo MTU enabled on the 
switch and each Dlink card's MTU set at 9000 from the ifcfg-eth1 file. I 
want to know how I can use open mpi (any version >=1.01) to use ethernet 
bonding to get 2 gig eth cards to boost performance. I have 512MB memory 
on each machine for a total of 8 GigBytes Memory and a hard disk on each 
node.. I use HPL/Linpack to run benchmarks and get 28.36GFlops with open 
mpi 1.1a1br9098 and with mpich2 1.03 i get 28.7Gflops using only one 
ethernet (GIg Dlink) with jumbo frames on both benchmarks at MTU=9000. I 
use -mca btl tcp on openmpi. The N = 26760 and NB= 120 for HPL.dat at 
P=4 Q=4 for 16 processors for both benchmarks using openmpi and mpich2. 
Can any one tell me if I will get a performance increasse > 29GFlops 
using the two Switches and 2 GigEth Nic cards per node if I use Ethernet 
Channel Boning in FC4?
Thank you,
Allan Menezes