Author: Frank E. Oldham
Date: 18:11:25 06/25/02
Go up one level in this thread
On June 25, 2002 at 17:15:07, Robert Hyatt wrote: >On June 25, 2002 at 09:07:27, Vincent Lejeune wrote: > >>On June 25, 2002 at 08:56:04, Adam Oellermann wrote: >> >>>On June 25, 2002 at 07:54:35, Vincent Lejeune wrote: >>> >>>>On June 25, 2002 at 05:09:04, Adam Oellermann wrote: >>>> >>>>... >>>>>As I understand it, the Power4 blows the doors off Itanium2 for integer >>>>>performance. So a dual for approx $20000 and a quad for approx $30000 would >>>>>represent an *immense* amount of chess for your money. Me, I'd love to see >>>>>Crafty on one of these guys clean up ICC... Of course, while it's dreamtime, IBM >>>>>have 32-way boxes with 1.4GHz Power4 CPUs >>>>> >>>>>Cheers >>>>>Adam >>>> >>>>Bob, would you compare the speed of such computer and the one who run Cray >>>>Blitz, please ? >>> >>>Surely the differences in the architecture/purpose between a 64-bit SMP Unix box >>>and a Cray must fill any honest comparison with weasel words. I am sure there >>>are some things which the Cray would do much faster; some the big IBM boxes >>>could probably compete. I would ***guess*** that the Cray would run Cray Blitz >>>faster, but a 32x1.4GHz Power4 would run Crafty faster; Cray Blitz taking >>>advantage of unusual features of the Cray, with Crafty being more suited for >>>"general-purpose" computers. >>> >>>Disclaimer: I've never even seen a Cray up close, and therefore defer to just >>>about anyone who might have an opinion on this :) >> >>My question was a bit unclear, I just would to know the comparison, in >>Nodes/secondes between "CrayBlitz on cray" and "Crafty on such machine" :) > > >For the Cray T932, selling at $60,000,000 when new, Cray Blitz could search >about 7M nodes per second using all 32 processors. Divide 32 into 7M and you >get about 200K nodes per CPU, roughly. An equivalent Itanium2 or PPC4 ought >to run at way over 32M nodes per second, assuming you could get a 32 node >machine and that it is based on shared memory rather than message-passing like >the SP machines... "SpecRates" are useful to look at -- from spec.org -- dual Dell PWS 530 with 2 2.4GHz Xeons -- 2 copies of crafty rate = 18.7 dual Athlon MP2000+ with 2 1.667GHz Athlon MPs -- 2 copies of crafty rate = 22.1 32-way AlphaServer GS320 with 32 1GHz Alphas -- 32 copies of crafty rate = 265 32-way IBM pSeries690 Turbo with 32 1.3GHz POWER4s -- 32 copies of crafty rate = 299 The pSeries seems to scale fairly well.
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