23.55 Mflops/W according to green500 estimates (#488 in thier list) 2008/12/12 Vincent Diepeveen <d...@xs4all.nl>
> > On Dec 12, 2008, at 8:56 AM, Eugen Leitl wrote: > > >> http://www.goodgearguide.com.au/article/270416/inside_tsubame_- >> _nvidia_gpu_supercomputer?fp=&fpid=&pf=1 >> >> Inside Tsubame - the Nvidia GPU supercomputer >> >> Tokyo Tech University's Tsubame supercomputer attained 29th ranking in the >> new Top 500, thanks in part to hundreds of Nvidia Tesla graphics cards. >> >> Martyn Williams (IDG News Service) 10/12/2008 12:20:00 >> >> When you enter the computer room on the second floor of Tokyo Institute of >> Technology's computer building, you're not immediately struck by the size >> of >> Japan's second-fastest supercomputer. You can't see the Tsubame computer >> for >> the industrial air conditioning units that are standing in your way, but >> this >> in itself is telling. With more than 30,000 processing cores buzzing away, >> the machine consumes a megawatt of power and needs to be kept cool. >> >> > 1000000 watt / 77480 gflop = 12.9 watt per gflop. > > If you run double precision codes on this box it is a big energy waster > IMHO. > (of course it's very well equipped for all kind of crypto codes using that > google library). > > Vincent > > > Tsubame was ranked 29th-fastest supercomputer in the world in the latest >> Top >> 500 ranking with a speed of 77.48T Flops (floating point operations per >> second) on the industry-standard Linpack benchmark. >> >> While its position is relatively good, that's not what makes it so >> special. >> The interesting thing about Tsubame is that it doesn't rely on the raw >> processing power of CPUs (central processing units) alone to get its work >> done. Tsubame includes hundreds of graphics processors of the same type >> used >> in consumer PCs, working alongside CPUs in a mixed environment that some >> say >> is a model for future supercomputers serving disciplines like material >> chemistry. >> >> Graphics processors (GPUs) are very good at quickly performing the same >> computation on large amounts of data, so they can make short work of some >> problems in areas such as molecular dynamics, physics simulations and >> image >> processing. >> >> "I think in the vast majority of the interesting problems in the future, >> the >> problems that affect humanity where the impact comes from nature ... >> requires >> the ability to manipulate and compute on a very large data set," said >> Jen-Hsun Huang, CEO of Nvidia, who spoke at the university this week. >> Tsubame >> uses 680 of Nvidia's Tesla graphics cards. >> >> Just how much of a difference do the GPUs make? Takayuki Aoki, a professor >> of >> material chemistry at the university, said that simulations that used to >> take >> three months now take 10 hours on Tsubame. >> >> Tsubame itself - once you move past the air-conditioners - is split across >> several rooms in two floors of the building and is largely made up of >> rack-mounted Sun x4600 systems. There are 655 of these in all, each of >> which >> has 16 AMD Opteron CPU cores inside it, and Clearspeed CSX600 accelerator >> boards. >> >> The graphics chips are contained in 170 Nvidia Tesla S1070 rack-mount >> units >> that have been slotted in between the Sun systems. Each of the 1U Nvidia >> systems has four GPUs inside, each of which has 240 processing cores for a >> total of 960 cores per system. >> >> The Tesla systems were added to Tsubame over the course of about a week >> while >> the computer was operating. >> >> "People thought we were crazy," said Satoshi Matsuoka, director of the >> Global >> Scientific Information and Computing Center at the university. "This is a >> ¥1 >> billion (US$11 million) supercomputer consuming a megawatt of power, but >> we >> proved technically that it was possible." >> >> The result is what university staff call version 1.2 of the Tsubame >> supercomputer. >> >> "I think we should have been able to achieve 85 [T Flops], but we ran out >> of >> time so it was 77 [T Flops]," said Matsuoka of the benchmarks performed on >> the system. At 85T Flops it would have risen a couple of places in the Top >> 500 and been ranked fastest in Japan. >> >> There's always next time: A new Top 500 list is due out in June 2009, and >> Tokyo Institute of Technology is also looking further ahead. >> >> "This is not the end of Tsubame, it's just the beginning of GPU >> acceleration >> becoming mainstream," said Matsuoka. "We believe that in the world there >> will >> be supercomputers registering several petaflops in the years to come, and >> we >> would like to follow suit." >> >> Tsubame 2.0, as he dubbed the next upgrade, should be here within the next >> two years and will boast a sustained performance of at least a petaflop (a >> petaflop is 1,000 teraflops), he said. The basic design for the machine is >> still not finalized but it will continue the heterogeneous computing base >> of >> mixing CPUs and GPUs, he said. >> _______________________________________________ >> Beowulf mailing list, Beowulf@beowulf.org >> To change your subscription (digest mode or unsubscribe) visit >> http://www.beowulf.org/mailman/listinfo/beowulf >> > > > _______________________________________________ > Beowulf mailing list, Beowulf@beowulf.org > To change your subscription (digest mode or unsubscribe) visit > http://www.beowulf.org/mailman/listinfo/beowulf >
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