Author: Robert Hyatt
Date: 15:43:15 10/17/99
Go up one level in this thread
On October 17, 1999 at 15:22:19, walter irvin wrote: >On October 16, 1999 at 15:21:11, Bruce Moreland wrote: > >>On October 16, 1999 at 11:29:11, walter irvin wrote: >> >>>first i'm going to admit that i know as much about multi processing as i do >>>about brain surgery .but it just seems to me that if a person had say 4 cpu's a >>>way to attack the problem COULD be as follows . >>>1.first divide the moves if there are 20 then each gets 5 ect >>>2.after each cpu gets to say 5 ply take the high score and go with it .disconect >>>the other 3 cpu's transfer them up the tree to 6 ply do the same thing over and >>>over to get real deep ?????? >>> >>>maybe if you could get deep enough , you could turn tactics into strategy just >>>by sheer depth ??????? >> >>It is more complicated than this. The moves don't take the same amount of time >>to search, some of them take a long time. And this isn't just a hypothetical >>case, it will happen in every search. In a perfect world idle processors would >>go help out on searches that are taking a long time. >> >>bruce > >ok how about instead take the start position give it to cpu A .now most programs >crunch through 5 ply in a split sec .once cpu A gets to 5 ply then cpu B makes >ply 4 its start position . when cpu B gets to 5 ply , cpu C makes cpu B 4th ply >its start position . so on and so on . if it proves to be bad some where along >the line simply change the direction of the search .in simple positions make the >ply count higher , in complex positions make the ply count lower .it takes much >less time to search from 1 to 5 ply than from 10 to 15 ply or 15 to 20 ply i >think . > there may be a major flaw in my suggestion????????? but i dont know ,maybe >some one who does know could explain the flaw ??????????? there is a major flaw... it is called 'alpha/beta'. and you are spending a lot of time with one searching, and the other 479 doing nothing (DB2 used 480 chess processors).
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