[Beowulf] "dual" Quad solution from Tyan
karsten.petersen at megware.com
Tue Feb 28 04:46:19 EST 2006
just some remarks (I have a VX50 with 8x Opteron 880 in the other room...):
Mark Hahn schrieb:
> afaikt, this is a ladder design:
> | | | |
Not quite, this would make no use of two HT channels. Its like this:
| | \/|
| | /\|
(The two leftmost CPUs need their third HT to connect the two chipsets.)
> 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?
Well, from my experiences with the first sold VX50 systems: If you have
a well scaling MPI application you are probably better off in
price/performance with a bunch of Opteron 180, 252 or 280 based machines
and Infiniband. (Or Intel Bensley...) I consider these VX50 beasts
more interesting for pre/postprocessing and not too large shmem/omp
applications. Such a machine is the answer to "16 threads - do I really
need an Altix?"
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