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Subject: Re: [OMPI users] Gigabit ethernet (PCI Express) and openmpi v1.2.4
From: George Bosilca (bosilca_at_[hidden])
Date: 2007-12-17 18:46:35


You should run a shared memory test, to see what's the max memory
bandwidth you can get.

   Thanks,
     george.

On Dec 17, 2007, at 7:14 AM, Gleb Natapov wrote:

> On Sun, Dec 16, 2007 at 06:49:30PM -0500, Allan Menezes wrote:
>> Hi,
>> 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.
> What is in your $HOME/.openmpi/mca-params.conf? May be are hitting
> your
> chipset limit here. What is your HW configuration? Can you try to run
> NPtcp on each interface simultaneously and see what BW do you get.
>
> --
> Gleb.
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