CrayLink connections between Origin 2000s

Sridhar Ayengar ploopster at gmail.com
Tue Dec 18 12:43:12 CST 2007


Pete Turnbull wrote:
> On 18/12/2007 09:57, Joost van de Griek wrote:
>>> Sounds like an ordinary (for SGI types of ordinary) Onyx2.  That has 
>>> the framebuffer hardware in the upper module, and CPUs in the lower; 
>>> one framebuffer module per machine, but up to 7 (IIRC) CPU modules in 
>>> multi-rack configurations.
>>
>> Seven CPU modules is unpossible. The (hyper)cube topology nust be 
>> maintained, so you can only expand a machine by doubling the number of 
>> modules connected together. Powers of two.
> 
> I know we've run odd numbers under fault conditions.  Sure, the 
> interconnections are sub-optimal, but I don't believe it has to be 
> powers of two.

Anyway, there's nothing stopping someone from building a 7-item 
hypercube in a tightly curved space.  8-)

Peace...  Sridhar



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