[Beowulf] "dual" Quad solution from Tyan
hahn at physics.mcmaster.ca
Mon Feb 27 20:53:44 EST 2006
> I'm responsible for the aquisition of my labs new cluster. I already had
what's the purpose of the cluster? without a well-defined purpose,
there's no way to evaluate the options...
> here, in Portugal. The target machine I was looking for was 8 node with
> dual processor Opteron (16 CPU). The machine that was at the presentation
OK, so 8 dual-socket nodes will deliver an aggregate memory bandwidth
of 16*6.4 GB/s, and a capacity of 64 dimms.
afaikt, this is a ladder design:
| | | |
which is 5 hops corner-to-corner, with a bisection of 3.2 GB/s per node.
half the aggregate memory bandwidth and capacity.
> which means 8 CPU, dual core. And all are connect with hypertransport
> which meand I got ready of latency I figure. So...
well, HT latency is better than gigabit, if that's what you mean.
I've never read a good evaluation of MPI implementations on this kind
don't forget that dual-core is lower clocked.
> The professor head of the lab wants me to know "if that is so good why
> isn't everyone buying one?"
who says it's so great? the HT fabric is pretty far from a "perfect"
low-latency 16-port crossbar, for instance. also, is it really cheaper?
how about if you compare to four 2-socket DC nodes?
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