Author: Robert Hyatt
Date: 05:30:04 09/04/01
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On September 04, 2001 at 03:29:05, Ed Schröder wrote: >On September 04, 2001 at 02:32:07, Ed Schröder wrote: > >>On September 03, 2001 at 21:27:30, Robert Hyatt wrote: >> >>>No, but you should stop making pronouncements about various processors, based >>>solely on how your program runs on them. That is _not_ a good benchmark. I'll >>>bet you any amount of money you want that Cray Blitz, in pure fortran, will >>>run 10x faster than your program, on a cray. Because that code was designed >>>to work on a vector architecture, and has specific algorithms designed to take >>>advantage of that kind of hardware. >> >>Just curious, when was the last time you have started Cray Blitz on a Cray? >> >>Ed > >More to this, see: http://www.top500.org/sublist/index.php3 > >Which is a top-500 of the fastest installed hardware in the world. > >Rank Manufacturer (GFlops) Processors > >1. IBM ASCI White,SP Power3 375 MHz [7226.00] [8192] >2. IBM SP Power3 375 MHz 16 way [2526.00] [2528] >3. Intel ASCI Red [2379.00] [9632] >4. IBM ASCI Blue-Pacific [2144.00] [5808] > >11. Cray Inc. T3E1200 [1127.00] [1900] > >439. Presto III Athlon 1.333 GHz [77.40] [78] > >Interesting is of course the AMD which gets almost 1 GFlop per processor where >the Cray by far does not get 1 GFlop per processor. Bottom line: isn't your >beloved Cray out-performed by nowadays micro processors available from your >local super market? > >Ed Nope. Ever seen anybody do anything _real_ on a pack of PCs? And then compare that to a Cray. A pack of PCs has a lot of potential performance. But they have little interconnect bandwidth. Some applications will run well on such clusters. Many won't run at all. The Cray is a general-purpose solution to _any_ problem that will run on a computer. There is _no_ AMD that will do a gigaflop. Not sure what number you are looking at there. That would require a single cpu to execute one floating point instruction every nanosecond, sustained. A PC can't begin to do that, under any circumstances.
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