Author: Vincent Diepeveen
Date: 14:51:12 07/12/03
Go up one level in this thread
On July 11, 2003 at 12:52:13, Robert Hyatt wrote: >On July 10, 2003 at 23:18:30, Vincent Diepeveen wrote: > >>On July 10, 2003 at 16:36:50, Robert Hyatt wrote: >> >>>>You show up with a cray supercomputer and i may only bring something my hands >>>>can carry :) >>> >>>Feel free to do so. I'll take a T932 over _anything_ you can carry by >>>hand, no questions asked. >> >>The Cray the NWO owned a bunch of years ago was replaced by the 1024 processor >>TERAS machine in 2000. > >Please read what I wrote. "over anything you can carry by hand..." > >I think that is pretty clear. And you aren't going to carry a 1024 processor >TERRA by hand. > > >> >>It now is upgraded to 1440 processors. That is a new machine with 416 processors >>is added to it. Most jobs they found out at the TERAS were either up to 8 cpu's >>or up to 32 cpu's. >> >>>>I'm not sure about the microprocessor designs, we can ask AMD and intel after >>>>it. Apple doesn't produce microprocessors at all. They use IBM processors >>>>nowadays and before IBM they used Motorola. >>> >>>Apple produces _machines_. They do circuit layout and testing on a Cray. >> >>That's funny because i do not own a single apple product AFAIK. My sister does >>though. That's typical however as she is a graphics artist and VJ and makes a >>small chance to get our first female prime minister :) >> >>>> >>>>However about the weather forecasting guess why the 1024 processor from december >>>>2002 till end of gulfwar II was overloaded with weather guys :) >>>> >>>>It was like this. On average 400 cpu's got used up until december. Then suddenly >>>>a dang at the machine. When i checked out which dudes prevented me from doing a >>>>few tests, i knew it was going to be war soon. >>>> >>>>Weather guys LOVE memory. For them vector processing isn't so important as is a >>>>huge memory. >>> >>>They are related. Vector processing lets you _use_ "huge memory" efficiently. >> >>Yes put that in between "", see below. >> >>>> >>>>I remember a weather guy some 7 years ago who as a selfemployed managed to lay >>>>his hands on an outdated Sun machine with 2 processors. He was in the skies so >>>>happy. I asked him then why he was so happy with those dusted cpu's and he >>>>explained that he didn't care for the cpu's but for the 2 GB memory inside :) >>> >>>Cray's don't come with 2 gigs of memory. The T90 typically has 16-32 gigs. >> >>that's funny because that poor Cray T916 which was replaced by the TERAS, it has >>1 terabyte since 2000 already. It has soon nearly 2. > >Different machine. You won't do this on your Terra: > >double x [1000][1000][1000]; >and then do anything useful with it. that's less than 8GB! that's indeed not useful for the TERAS. Too small. It's as i said busy now creating a 8TB database for weather predictions. To use your way of representing that's a dataset of: double x [1024][1024][1024][1024]; Such 8GB arrays you can let 2 oxens handle even :) 350000 cpu hours come down to 350k gflops = 350 tflops = 0.35 petaflops I guess for matrix multiplications they'll be using for the 8TB database something like an approximation library, because a single matrix calculation with the weather prediction database is just too slow as you need = 10^40 calculations for that which even is a bit much for the Earth machine to do :) >That is the power of the Cray, to handle large arrays _and_ stomp through >them impossibly quick without regard to NUMA issues. That's why they're gonna use opterons and hypertransport in the future for Crays. >>The climate job that runs now at the TERAS needs around 350000 cpu hours and 10 >>terabyte of i/o, so 1 TB memory is more than welcome for it. >> >>When it would run on the old Cray T916 (strong oxens) that would take 150 years >>it says. >> >>Best regards, >>Vincent
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