Author: Vincent Diepeveen
Date: 05:37:49 07/08/03
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On July 08, 2003 at 00:33:09, Jeremiah Penery wrote: >On July 07, 2003 at 23:33:48, Robert Hyatt wrote: > >>On July 07, 2003 at 11:30:34, Vincent Diepeveen wrote: > >>>The total bandwidth a 256 node machine with bricks of 4 processors will have >>>then a total bandwidth of somewhere around: 12.4 Terabyte a second. >>> >>>Now *that* is very impressive. >> >>And imaginary I'll bet. > >Cray is supposed to be building a 10k processor Opteron supercomputer for Sandia >Labs. Its total aggregate bandwidth should far exceed 12.4TB/sec. > >>>Especially for the price they will deliver it for. >>> >>>A 5000 processor vector machine now costs around 700 million dollar. >> >>Where can you find a "5000 processor vector machine?" >> >>I know where there is a 32 processor vector machine. Nothing beyond >>that that I know of, unless you start counting I860 type boxes. > >NEC Earth Simulator has 5120 NEC SX-7(?) vector processors. Total cost was less >than $400m. around $680M it cost. >Here is a blurb about the chip, from the webpage: > >"Each AP consists of a 4-way super-scalar unit (SU), a vector unit (VU), and >main memory access control unit on a single LSI chip. The AP operates at a clock >frequency of 500MHz with some circuits operating at 1GHz. Each SU is a >super-scalar processor with 64KB instruction caches, 64KB data caches, and 128 >general-purpose scalar registers. Branch prediction, data prefetching and >out-of-order instruction execution are all employed. Each VU has 72 vector >registers, each of which can has 256 vector elements, along with 8 sets of six >different types of vector pipelines: addition/shifting, multiplication, >division, logical operations, masking, and load/store. The same type of vector >pipelines works together by a single vector instruction and pipelines of >different types can operate concurrently." > >Each chip consumes only about 140W, rather than Vincent's assertion of 150KW. the 125KW is for Cray 'processors' not fujitsu processors that are in the NEC machine. Ask bob i remember he quoted 500 kilowatt for a 4 processor Cray. So i divided that by 4. Trivially Cray machines using the opterons will be consuming less than that. Note that the cpu costs is nothing compared to what the routers etc eat. Best regards, Vincent
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