18 Dec
2007
18 Dec
'07
4:57 a.m.
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.
,xtG
tsooJ
18 Dec
18 Dec
9:55 a.m.
On 18/12/2007 09:57, Joost van de Griek wrote:
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.
--
Pete Peter Turnbull
Network Manager
University of York
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.
10:39 a.m.
In article <4767DF48.70601 at dunnington.plus.com>,
Pete Turnbull <pete at dunnington.plus.com> writes:
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.
I believe this is correct. I haven't read anything so far that
indicates you *must* have powers of two. For instance, you can quite
readily connect two modules within a rack that don't have powers of
two CPUs (i.e. 3 node boards in one module, 1-4 node boards in another
module, for 6+(2/4/6/8) CPUs total.
--
"The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download
<http://www.xmission.com/~legalize/book/download/index.html>
Legalize Adulthood! <http://blogs.xmission.com/legalize/>
1:43 p.m.
Pete Turnbull wrote:
On 18/12/2007 09:57, Joost van de Griek wrote:
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
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.
6062
days inactive
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