Author: Uri Blass
Date: 22:09:38 02/01/06
Go up one level in this thread
On February 01, 2006 at 19:06:44, Bryan Hofmann wrote: >On February 01, 2006 at 02:17:40, Uri Blass wrote: > >>On February 01, 2006 at 01:50:23, Ryan B. wrote: >> >>>On January 31, 2006 at 23:07:08, walt irvin wrote: >>> >>>>in a rybka vs hydra match ,,,with rybka using a athlon 3800 12 game match 40 >>>>moves in 2 hours what is the predicted score ??????????? >>>> >>>>mine is hydra 9/3 >>>> >>>>walter >>> >>>I think your prediction is very good. What I think many people fail to realize >>>about Hydra is that it is a dedicated chess machine so it does not suffer the >>>same overheads that PC chess engines have. Also Software optimized for just one >>>exact platform can be very fast compared to traditional PC programs. >>> >>>Ryan >> >>I do not agree. >> >>By that logic Crafty with 8 processors can also beat Rybka with one processor >>but it is probably not the case. >> >>The fact that hardware that is dedicated for one task has a potential advantage >>does not prove that hydra is better. >> >>The facts are that Rybka is leading the CEGT list even if you consider only 32 >>bits and not one of the better hardware participants. >> >>This is from the CEGT rating list. >> >>2 Rybka 1.01 Beta 13-13b 32-bit 2886 45 45 189 74.1 % 2704 28.6 % >>6 Deep Shredder 9.12 x64 2CPU 2822 35 34 283 64.7 % 2717 31.1 % >> >>14 Shredder 9 2754 8 8 4776 63.3 % 2660 31.8 % >>34 Crafty Cito 1.4.2 64-bit 2CPU 2695 59 58 106 63.7 % 2598 27.4 % >> >>As you can see even the combination of 64 bits and 2 cpu does not help when you >>have inferior program. >> >>If 64 bits+2 cpu gives does the program 3 times faster then you have: > >Not 3x, the 32bit vs 64 bit with the above program under windows gives your 27% >increase. In Rybka it is more than 60% and I thought that it is similiar with Crafty because Crafty is a bitboard program. Your point is correct for shredder that was only 20% faster in the 64 bit version but on the other hand I believe that shredder has some software improvement and shredder9.12 is better than shredder9. Running Crafty on a dual vs a single gives you about an 80% increase >(have not tested but seen results posted of a 1.8/1.9). this would mean about a >2.1. > >What is interesting is that if you compare the 32 bit version that was run in >the CEGT vs the dual version you see that there is an increase of 160+ ELO. >While the 2 CPU version has not run as many games as the single it sort of shows >the 2x speed up is worth more then the 50 ELO points I have seen posted here >before. Only in CEGT conditions. I suspect that using books reduce the advantage of 2 cpu in rating points. I also think that testing in unequal time control is needed to know the advantage from speed because we do not know the effective advantage of having 2 cpu. In thoery it can be also equivalent to more than 2 times advantage(espacally when the deep version get 512 mbytes hash against 256 mbytes of the single cpu). Uri
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