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Subject: [OMPI users] Gigabit ethernet (PCI Express) and openmpi v1.2.4
From: Allan Menezes (amenezes007_at_[hidden])
Date: 2007-12-16 18:49:30

 How many PCI-Express Gigabit ethernet cards does OpenMPI version 1.2.4
support with a corresponding linear increase in bandwith measured with
netpipe NPmpi and openmpi mpirun?
With two PCI express cards I get a B/W of 1.75Gbps for 892Mbps each ans
for three pci express cards ( one built into the motherboard) i get
1.95Gbps. They all are around 890Mbs indiviually measured with netpipe
and NPtcp and NPmpi and openmpi. For two it seems there is a linear
increase in b/w but not for three pci express gigabit eth cards.
I have tune the cards using netpipe and $HOME/.openmpi/mca-params.conf
file for latency and percentage b/w .
Please advise.
Allan Menezes