Author: Vincent Diepeveen
Date: 19:05:28 04/26/01
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On April 26, 2001 at 19:58:43, Robert Hyatt wrote: >On April 26, 2001 at 18:11:20, Rajen Gupta wrote: > >>hi bob: you mentioned in you recent post regarding hsu's chip being capable of >>doing 1 billion nodes per sec-is this an advanced version of the "chess chips" >>which were present oin the deep blue?-as far as i remember the deep blue had a >>number of general purpose powerpc processors and a number of what they termed >>"chess chips" if this is so >NO... here is the math. DB2 used 480 chess processors. About 1/2 of the >processors ran at 20mhz, the other half ran at 24mhz. 20mhz turns into 2M >nodes per second, 24 turns into 2.4M nodes per second. The easiest way to >evaluate this is 480 * 2.2M nodes per second, which is roughly 1 billion nodes >per second peak. He also reported that he drove the chess chips at about >70% duty cycle with the SP2. So the actual NPS was 480 * 2.2M * .7, which >is roughly 700M nodes per second. He scaled this back to 200M, I assume, >based on the search overhead which makes many of the nodes searched not >necessary if the search wasn't parallel. IE in Crafty, on a quad xeon/700, >I search about 1.5M nodes per second peak. But roughly 1/4th of that would >not be searched by a single cpu, so my "effective" nps is lower. Say 1.1M or >so. >I assume this is why Hsu quoted 200M, because he certainly gave the 480 >number, and the 2.0/2.4M nps per chip number in several different places... 200M nodes a second let's get to that. .7 i never read that number anywhere, woudl be amazing if you can keep 'em busy for .7 considering a single SP processor addressed 30 processors... Anyway the question of Rajen was probably : "why does Hsu think that if he builds a new cpu it is as powerful as hundreds of chips which in 1997 shaped deep blue 2". Well that's easy to answer. The deep blue chips were even in 1997 made from outdated technology. 0.60 microns. Todays standard is 0.18. Note GEOFORCE3 graphics card is already 0.15 microns and real soon we'll see 0.12 or 0.13 whatever getting used. Suppose Hsu would redesign those 20Mhz and 24Mhz processors (new info to me btw) in 0.12 or 0.13 technology, then a single cpu would be faster as 480 chessprocessors were in 1997. I don't doubt that! I have no idea to how many Mhz it would be clocked but it sure would be way faster! Compare for example that we can buy machines of 1 Ghz. I remember still a few years ago i had a 20Mhz 386sx (16 bits/32 bits) machine. that's more as a factor 50 difference in speed though in advantage of my nowadays fast Ghz machine :) > > > > >>1)how can one single chip be twice as powerful as the entire deep blue, which >>had hundreds of processors? > >You mis-read what I said. I was talking about the peak NPS for the full DB2 >machine. 1,000 M nodes per second. > > > > >>2)are these chess chips of deep blue and the superchip of hsu good for only >>chess calculations or can it act as a general purpose processor? > >Special chess purpose only... > > > >> >>thanks >> >>rajen
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