On Apr 5, 2011, at 9:58 AM, Vincent Diepeveen wrote: > > On Apr 5, 2011, at 7:22 AM, Greg Lindahl wrote: > >> On Mon, Apr 04, 2011 at 09:54:37AM -0700, Massimiliano Fatica wrote: >> >>> If you are old enough to remember the time when the first distribute >>> computers appeared on the scene, >>> this is a deja-vu. >> >> Not to mention the prior appearance of array processors. Oil+Gas >> bought a lot of those, too. Some important radio astronomy data >> reduction algorithms were coded for them -- a VAX 11/780+FPS AP120B >> was 10X faster than the VAX by itself. Then microprocessor-based >> workstations arrived, and the game was over, ease of use FTW. >> >>> Even on a single system, if you try an auto-parallel/auto- >>> vectorizing >>> compiler on a real code, your results will probably be >>> disappointing. >> >> The wins from such compilers have been steadily decreasing, as main >> memory gets farther and farther away from the CPU and caches. >> >> -- greg >
Early Morning oh oh oh oh, apologies the context might be clear yet the sentences were written down wrong. > It's different this time indeed; classic cpu's will never again > deliver big performance. > ack > cache - coherency is simply too complicated with many cores. 1) Cache-coherency is too complicated for CPU's > cpu's also will need a manycore co-processor therefore. > ack > furthermore manycores simply are cheaper to produce and they can eat > a bigger powerbudget. > ack > 3 very powerful arguments which regrettably limits cpu's, but that's > the price we pay for progress. > ack > It won't mean cpu's will go away of course any soon, they're so > generic and easy to program that > they will survive. Just offload the calculations to the manycores. > ack > please don't estimate the argument of cheaper to produce. > > please don't UNDERESTIMATE the argument of cheaper to produce only 6 out of 8 score = 75% sharp in the morning > >> >> >> _______________________________________________ >> Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin >> Computing >> To change your subscription (digest mode or unsubscribe) visit >> http://www.beowulf.org/mailman/listinfo/beowulf > > _______________________________________________ > Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin > Computing > To change your subscription (digest mode or unsubscribe) visit > http://www.beowulf.org/mailman/listinfo/beowulf _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
