[Beowulf] Re: Finally, a solution for the 64 core 4TB RAM market
Bogdan.Costescu at iwr.uni-heidelberg.de
Fri May 29 10:18:53 EDT 2009
On Fri, 29 May 2009, Mark Hahn wrote:
> but the point is that 8-socket fat nodes are going to be more
> expensive; traditionally nonlinearly more expensive. current 4s
> boxes are more than 2x 2s cost.
Indeed, but you can use a 4s machine directly, without other
investment, with best performance for either MPI or OpenMP job, while
the 2 machines with 2s will need a fast interconnect to achieve a
similar setup and performance, adding to the cost of the nodes.
If the application doesn't scale too well to high number of nodes
anyway (f.e. a molecular dynamics code with a small size molecular
system, using PME, etc.), nodes which are fat enough to accomodate it
will offer most often the best performance and will be much easier to
manage - no need for extra drivers, testing of cables, routing/mapper,
etc. And 32-64 cores per node would be exactly the sweet spot for the
types of jobs that my colleagues are running...
IWR, University of Heidelberg, INF 368, D-69120 Heidelberg, Germany
Phone: +49 6221 54 8240, Fax: +49 6221 54 8850
E-mail: bogdan.costescu at iwr.uni-heidelberg.de
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