Re: Two Myrinet PCI Interfaces inside one node in a cluster

Hi,

On Sat, 2003-03-29 at 08:01, Zac Morris wrote:
> I have set up a 4 node cluster, wherein each node
> contains a Myrinet PCI interface and all the nodes are
> connected to a Myrinet switch. 
> Is it possible to have two Myrinet PCI interfaces per
> node? If yes, will such a setup increase performance,
> as compared to having a single interface per node? Is
> there any documentation regarding this on the Myricom
> website?

Yes.  Large SMP machines and/or machines with more than one
PCI bus can definitely benefit from multiple NICs.  However,
multiple NICs on the same PCI bus can cause PCI bus
contention.  Current software does not allow you to aggregate
bandwidth between the 2 or more NICs.  However, you can
load balance MPI processes across several NICs in your hosts.
Refer to the README-mpich-gm in the MPICH-GM distribution
for details.

If you go to the new searchable Myrinet FAQ
   http://www.myri.com/scs/FAQ/
and click on "Search" in the upper lefthand corner, you
can search for the keywords "multiple" and "channel bonding".

Feel free to contact us at [email protected] if you have 
further questions.

Susan



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Susan Blackford
Member of Technical Staff
Myricom Inc.
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