On Mon, Dec 17, 2012 at 8:15 PM, Lux, Jim (337C) <james.p....@jpl.nasa.gov>wrote:
> I wasn't thinking so much about code efficiency, more "wall plug power" > efficiency. The board may consume 250W, but it will take non-zero power to > support that board, and then the power supply efficiency needs to be taken > into account. But I suspect the 1 GFLOP/W was more just an "old" "rounded > off" number. > > Yes... it's very hard work to get to a real 75 GFLOP/Watt, but that is > what DARPA is all about... High Risk, High Reward. Somehow, though, I > can't see building a new fab with smaller feature sizes for the paltry sum > of 20M. More like they'll do some architecture studies, a pile o'modeling > (if we DID invest $1B in a new fab, here's what you might be able to do), > and do a bunch of work on things like failure tolerant architectures (if > you have a sea of processors, and X% are dead at any given time, how do you > write software to run on that sea) > > I wonder what Nvidia chips are used in Audis and BMWs? The video display, > perhaps: there's a nifty 3D rendered view of the GPS mapping info in the > new BMWs? I don't see a real need for that kind of horsepower in an Engine > Control Unit. Maybe in a smart cruise control that does station keeping, > or in a collision avoidance system. Actually, I don't really see Nvidia > being in the "safety critical" space at all. > > I really wouldnt be suprised if its the tegra's that would be in those vehicles. Only thing i coudl think of it would be used in in car GPS or the fancy radio setup with all those features they have, who knows. > > > > Jim Lux > > > -----Original Message----- > From: beowulf-boun...@beowulf.org [mailto:beowulf-boun...@beowulf.org] On > Behalf Of Vincent Diepeveen > Sent: Monday, December 17, 2012 10:02 AM > To: Lux, Jim (337C) > Cc: Beowulf@beowulf.org > Subject: Re: [Beowulf] DARPA issues 20 MUSD grant to nVidia to go from 1 > GFLOPS/Watt to 75 GFLOPS/Watt > > On Dec 17, 2012, at 6:27 PM, Lux, Jim (337C) wrote: > > > That could be a notional 1 GFLOP/Watt in a fielded system. > > Even linpack is 70% - 80% efficient on this so should get out oh let's use > a conservative 4.5 flops/watt effectively at codes. > > > > > > Note that (to my big surprise) it seems to be the case that the gpu's are > effectively getting higher efficiency than Xeon Phi here. > > > The original documents for PERFECT are probably a year or two old by > > now.. but what DARPA is looking for is a nearly 2 order of magnitude > > improvement... Whether they started at 1 or 1.4 or 6 really doesn't > > make much difference to what they're looking for. > > > > Yeah well that 2 orders of a magnitude is just 1 order of a magnitude if > we start at 6. > > 6 ==> 75 = factor 12 > > They speak about 7 nm technology in the accompanying document. That's a > very conservative estimate, obviously in theory even with todays 2 > dimensional way of building (not to mention when things really get 3d), we > speak of a difference in theory of: > > (28 / 7) ^ 2 = 4^2 = 16 > > Given enough time, engineers will get that factor 16 easily out of > transition over the years from 28/32 nm to 7 nm. > Note that 7nm is still far beyond the horizon. > > However if they would have needed to improve current design factor 75 > moving from 28/32 nm they use today to 7 nm, that would be a complicated > bet. > > > In any case, it's a long way from a manufacturer's cut sheet to a > > system installed in a tank bouncing through the woods.. > > > > > > Jim Lux > > > > -----Original Message----- > > From: beowulf-boun...@beowulf.org [mailto:beowulf- > > boun...@beowulf.org] On Behalf Of Vincent Diepeveen > > Sent: Monday, December 17, 2012 5:50 AM > > To: Eugen Leitl > > Cc: Beowulf@beowulf.org; i...@postbiota.org > > Subject: Re: [Beowulf] DARPA issues 20 MUSD grant to nVidia to go from > > 1 GFLOPS/Watt to 75 GFLOPS/Watt > > > > "todays 1 gflop/watt" ? > > > > The K20X delivers 1.4 Tflop nearly. > > If i google it's 235 watt TDP. > > > > 1.4 Tflop / 235 = 6 gflops/watt > > > > On Dec 17, 2012, at 2:21 PM, Eugen Leitl wrote: > > > >> > >> http://www.networkworld.com/community/blog/darpa-awards-20m-nvidia- > >> stretch-achilles-heel-advanced-computing-power > >> > >> > > > > _______________________________________________ > 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 > -- Jonathan Aquilina
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