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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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