[Beowulf] building Infiniband 4x cluster questions

Vincent Diepeveen diep at xs4all.nl
Mon Nov 7 06:28:37 PST 2011

hi John,

I had read already about subnet manager but i don't really understand  
this, except when it's only configuration tool.

I assume it's not something that's critical in terms of bandwidth, it  
doesn't need nonstop bandwidth from the machine & switch is it?

In case of a simple cluster consisting out of 1 switch with some  
nodes attached, is it really a problem?

On Nov 7, 2011, at 12:10 PM, John Hearns wrote:

> Vincent,
> I cannot answer all of your questions.
> I have a couple of answers:
> Regarding MPI, you will be looking for OpenMPI
> You will need a subnet manager running somewhere on the fabric.
> These can either run on the switch or on a host.
> If you are buying this equipment from eBay I would imagine you will be
> running the Open Fabrics subnet manager
> on a host on your cluster, rather than on a switch.
> I might be wrong - depends if the switch has a SM license.
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