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Another AMD supercomputer, 13,000 quad-core



 
 
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Old November 17th 06, 02:57 AM posted to comp.sys.ibm.pc.hardware.chips
Robert Myers
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Posts: 606
Default Another AMD supercomputer, 13,000 quad-core

Del Cecchi wrote:

If I recall red storm correctly, it was a hypercube so had same problem
as blue gene.


Indeed, it did. I didn't wear my pencil down to a nub doing
calculations, but, in general, the strategy of Blue Gene heads in the
wrong direction by using less-powerful processors. If network
connections is the limiting factor, you want to get the most bang for
every connection, and Blue Gene plainly doesn't do that. It's not a
big effect, but it's why Blue Gene tore it as far as I was concerned.

I was particularly annoyed by the claims of scalability, meaning we can
wire as many of these suckers together as you've got money.

The network processors of Blue Gene and the power and space efficiency
represent genuine engineering accomplishments of which IBM should be
proud, but Blue Gene is not the general purpose scientific workhorse it
is claimed to be.

I've corresponded with computational scientists who are very happy with
hypercube computers. If you through enough bandwidth at each link,
even the performance on FFT's doesn't have to be pathetic.

It's been a while since I've reviewed the situation, but last time I
paid attention, LBL was putting together a very respectable machine
that looked to have a more reasonable balance of capabilities. For all
I know, IBM is building it or already has built it. It just won't make
it to the top of the Linpack chart.

Robert.

 




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