[Beowulf] DARPA issues 20 MUSD grant to nVidia to go from 1 GFLOPS/Watt to 75 GFLOPS/Watt
Lux, Jim (337C)
james.p.lux at jpl.nasa.gov
Mon Dec 17 11:15:42 PST 2012
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.
From: beowulf-bounces at beowulf.org [mailto:beowulf-bounces at beowulf.org] On Behalf Of Vincent Diepeveen
Sent: Monday, December 17, 2012 10:02 AM
To: Lux, Jim (337C)
Cc: Beowulf at 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-bounces at beowulf.org [mailto:beowulf-
> bounces at beowulf.org] On Behalf Of Vincent Diepeveen
> Sent: Monday, December 17, 2012 5:50 AM
> To: Eugen Leitl
> Cc: Beowulf at beowulf.org; info at 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:
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