Author: Robert Hyatt
Date: 12:08:05 11/20/00
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On November 20, 2000 at 13:53:55, walter irvin wrote: >i have been thinking about multi processors and computer chess .my idea must be >wrong because no one uses the processors in this way .lets use the example of 32 >cpu machine . > depth cpu used >1 ply 4 >2 ply 4 = assumes that ply 1 has been played >3 ply 4 = assumes that ply 2 has been played >4 ply 4 = assumed that ply 3 has been played >5 ply 4 = assumes that ply 4 has been played >6 ply 4 = assumes that ply 5 has been played >7 ply 4 = assumes that ply 6 has been played >8 ply 4 = assumes that ply 7 has been played the cpu at the deepest >depth determines score > >it seems to me with the cpu's used in this manner depth of search would be much >deeper and could eliminate not all but alot more of the horizon effect .imagine >if 64 cpu's were used???surely 3000 elo could be achieved ??? like i said there >must be a flaw because its not done this way .anyone know why?? The problem is that the CPUs near the root of the tree aren't doing anything, while the cpus near the tips are overloaded. The tree is highly non-uniform, plus you can't evaluate the difference between two moves at the root until the searches below those two moves are finished. And then there is alpha/beta... and its serial behavior
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