[ofa-general] fat-tree CN nodes?

[Yevgeny Kliteynik]

Hi Frank,

Frank Olaf Sem-Jacobsen wrote:
> Right,so it has no connection with any topological properties of the fat 
> tree?

You're right, the term "Compute Node" by itself has no connection
to the topological properties of the fat tree. However, fat-tree
routing has some constraints on the topology, and one of these
constraints is that all the compute nodes are required to be
located at the same topological level of the tree (same rank).

> Which again means that the definition of compute nodes is only 
> necessary for the ability to balance these separately in the tree?

Right again, this is what the fat-tree routing does.

-- Yevgeny

> Thanks for your answer,
> 
> Cameron Harr wrote:
>> Hi Frank,
>> A compute node is a computer/server that is generally dedicated to 
>> doing computational work in a cluster or group of computers.
>> Cameron
>>
>> Frank Olaf Sem-Jacobsen wrote:
>>> Hi,
>>>
>>> I have been looking into the fat tree code, and I was wondering about 
>>> the definition of a compute node (CN). Are these part of the leaf 
>>> switches at the bottom of the fat tree, or are they extra switches 
>>> that are connected to the fat tree, e.g. the switch in a rack of 
>>> blades which is again connected to the fat tree?
>>>
>>> Appreciate the help,
> 
>