[Beowulf] Virginia Tech upgrade
hahn at physics.mcmaster.ca
Tue Jan 27 21:09:33 EST 2004
I draw several conclusions from the VT cluster:
- HPL is very cache-friendly. the dual-G5 has an impressive peak
flops rating, but pretty mediocre memory bandwidth. anyone have a
Stream result for a G5? I'd guess around 2.5 GB/s.
- HPL also doesn't penalize fractional bisection bandwidth clusters,
which is pretty interesting, since it *does* seem to reward
post-gigabit interconnect. latency, perhaps?
- the press isn't smart enough to notice that the VT cluster was
far too unreliable (no ECC) and used an aweful lot of floorspace.
it *is* neat that clusters are commodities nowadays, but is that news?
somehow I don't think very many future clusters will be built by
- a good PR stunt buys a lot of vendor discount. remember: the G5s
list at close to $5M total, and the IB kit is pushing $2M. I'm
guessing that VT can sell the G5's at a 30% discount. and Xserves cost
about 50% more than desktops, so VT winds up with around $10M from
Apple, for around $3M investment, nice!
> The xserve has ECC memory, which will bring the performance of their cluster
> up to what they say it is.
oh, come on. MTBF is ~10 hours, so short jobs are perfectly fine ;)
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