Author: Ed Schröder
Date: 14:29:34 07/25/00
Go up one level in this thread
On July 25, 2000 at 16:54:39, Alvaro Polo wrote: >On July 25, 2000 at 15:51:30, Ed Schröder wrote: > >>On July 25, 2000 at 14:39:59, Robert Hyatt wrote: >> >>>On July 25, 2000 at 11:15:45, Ed Schröder wrote: >>> >>>>On July 25, 2000 at 10:44:20, Chris Carson wrote: >>>> >>>>>On July 25, 2000 at 10:19:10, Ed Schröder wrote: >>>>> >>>>>>On July 25, 2000 at 08:44:57, Dave Gomboc wrote: >>>>>> >>>>>>>- the "1 million nodes/sec" figure is a peak figure, not an average >>>>>>> - average is 200k nodes/sec >>>>>> >>>>>>From the IBM site (may 1997): >>>>>> >>>>>> "Deep Blue was now capable of examining and >>>>>> evaluating an average of 100 >>>>>> million chess positions per >>>>>> second." >>>>>> >>>>>>Ed >>>>> >>>>>Thanks Ed! Accurate and factual as always. :) >>>> >>>>Somewhere else the 200M is mentioned (as a peak?). The text also mentions >>>>DB doing some pre-processor stuff (I think). >>> >>>This is all scrambled. Here are the right numbers: >>> >>>single chip: 2M or 2.4M nodes per second. >>> >>>DB2 (1997 Kasparov match): >>> >>>480 chess chips, half at 2M, half at 2.4M nodes per second. 1B nodes per >>>second peak, 700M nodes per second actually searched, roughly 70% of those >>>nodes are often referred to as "search overhead" reducing the effective NPS >>>for DB2 to 200M. DB1 (1996 Kasparov match) searched 100M effective nodes per >>>second... >>> >>>Those are straight from Hsu, so I feel pretty sure they are right... The others >>>are smeared across a time line that contains DB1 _and_ DB2... Where DB2 was >>>2x faster + move eval. >> >>The IBM pages say 256 processors and not 480. How come that Hsu's >>informations don't correlate with IBM's all the time? >> >>And now we have a new item. It was not 200M nodes but suddenly it is >>1000M nodes said by Hsu. Again it contradicts the IBM pages you know. >> >>Maybe you should not use the name of Hsu so much speaking on his behalf. >> >> > >I worked for IBM as a scientist at the IBM Scientific Center in Madrid. I would >very much more trust Hsu's number than "official IBM" numbers. PR's and >marketers at IBM are not stupid people (my father was a country general manager >there), they are on the contrary very intelligent, but they don't care that much >about scientific exactness in documents directed to the general public. They >probably wouldn't understand very well, for example, why the difference between >256 and 480 processors is significant. > >Alvaro With all respect to your opinion I believe that P/R people very well understand the value of numbers. If they don't they would do a very poor job which I find hard to believe. Ed >>>>Quote: >>>> >>>> "Deep Blue uses "live" software that can actually generate up >>>> to 200,000,000 positions per second when searching for >>>> the optimum move. The software begins this process by >>>> taking a strategic look at the board. It then computes >>>> everything it knows about the current position, integrates >>>> the chess information pre-programmed by the development >>>> team, and then generates a multitude of new possible >>>> arrangements. From these, it then chooses its best possible >>>> next move." >>>> >>>>Ed >>>> >>> >>>Sounds like something written for the general public, by someone that didn't >>>have any idea of how a computer plays chess in general. IE someone in a P/R >>>department writing about something he "thinks" he understands. The words sound >>>good. The paragraph is nearly meaningless.. >> >>"Sounds like..." >> >>"The paragraph is nearly meaningless......" >> >>"IBM P/R people are stupid......" >> >>Be careful, IBM might sue you one day :) >> >>Ed >> >> >> >>>> >>>> >>>>>Best Regards, >>>>>Chris Carson >>>>> >>>>>> >>>>>>> - you will have to verify for yourself if that figure is for one chip or more >>>>>>>- whether db uses forward pruning or not is obviously not clear >>>>>>> - bob says it doesn't >>>>>>> - article i read implies it does >>>>>>> - db logs also imply it according to ed >>>>>>> >>>>>>>Dave
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