----- Original Message ----- From: "Bill Broadley" [email protected] >If gallium arsenide or some other material gave us 10x the clock rate per >watt, but 1/2 the transistors would it really matter? Seemed like even intel >is begrudgingly admitting it's the memory bus, and finally the nehalem is >blessed with dramatically more bandwidth. > >Seems like increasingly cores are turning latency limited workloads (for the >parallel jobs of course) into bandwidth limited ones. Without a memory bus >that allows for 10x the bandwidth it doesn't really seem like 10x the clock >rate would be of particular use. Right. Excepting the potential for improving the performance of serial codes or pieces of serial code (and perhaps badly written code) , delivering 10x by clock or by core would not seem to change the bandwidth problem both create . Manycore core promises even greater multiples. For bandwidth limited data parallel codes, you might as well stay on the path of lowest economic resistance. rbw _______________________________________________ Beowulf mailing list, [email protected] To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
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