[Beowulf] 8p 16 core x86_64 systems

"C. Bergström" cbergstrom at pathscale.com
Tue Aug 12 10:50:31 PDT 2014

On 08/12/14 11:57 PM, Joshua Mora wrote:
> Hello Doug.
> AMD CPUs are connected together with a coherent fabric named Hypertransport.
> It allows to build shared memory system with coherency upto 8 numanodes.
> Currently, AMD CPUs have 1 numanode or 2 numanodes. The first is in 1
> package/socket named C32 and the second in a 1 package/socket named G34.
> The package G34 has 2 numanodes connected with Hypertransport.
> That is the way you can get in a single package upto 16 cores.
> Hypertransport technology allows only upto 8 numanodes.
> Therefore you can have mother boards that connect upto 8 C32 sockets or 4 G34
> sockets.
> Hypertransport consortium has designed extensions to overcome this limit,
> named high (numa) node count.
> Adding below a link to the specification.
> http://www.hypertransport.org/default.cfm?page=HighNodeCountSpecification
> Without the intend to flood this list with marketing BS:
Not taking away from any of the cool things which you can do with this.. 
I suspect the OP was trying to increase his density. What you mentioned 
would require 2 motherboards and also an interconnect between them.

I believe Cray may have a high density blade setup, but I'm not sure if 
there's anything like this for mere mortals.

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