Search found 886 matches

by smatovic
Thu Jul 26, 2012 1:57 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: help with negamaxed version of korfs rbfms
Replies: 8
Views: 811

Re: help with negamaxed version of korfs rbfms

Thanks Sven, i am trying to get an iterative version running, maybe you could take a look on this too? Somehow it hangs in a loop i guess... // iterative version in pseudo code depth = 1; alpha[0] = -INF; beta[0] = INF; node = root; n = node.children; // children is -1 when unexplored while(n > ...
by smatovic
Tue Jul 24, 2012 9:05 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: help with negamaxed version of korfs rbfms
Replies: 8
Views: 811

help with negamaxed version of korfs rbfms

Heyho, i could need some help with an negamaxed version of Korfs and Chickerings Recursive-Best-First-MiniMax-Search MiniMax-Version: BFMAX (Node, Alpha, Beta) FOR each Child[i] of Node M[i] := Evaluation(Child[i] > IF M[i] > Beta return M[i] SORT Child[i] and M[i] in decreasing order IF...
by smatovic
Sun Jul 15, 2012 12:37 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Choosing a GPU platform: AMD and Nvidia
Replies: 16
Views: 5355

Re: Choosing a GPU platform: AMD and Nvidia

As for chess: If a good SMP search works at the gpu's, it's easy to put with a riser card a bunch of gpu's at a mainboard. It's a bit of toying with wood then to have the cards above the motherboard with those riser cards, yet it means you can build a huge supercomputer at a single motherboard. Cur...
by smatovic
Sun Jul 15, 2012 11:35 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Choosing a GPU platform: AMD and Nvidia
Replies: 16
Views: 5355

Re: Choosing a GPU platform: AMD and Nvidia

it is not clear to me why. maybe they just weakened the multiplication unit for 32 bits integers. the 32x32 bits multiplication, not to mention double precision, is simply the thing that is part of weakest path in the gpu chip i would blindfolded guess. Take a look into the GK104 White-Paper page 9...
by smatovic
Sun Jul 15, 2012 11:10 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Choosing a GPU platform: AMD and Nvidia
Replies: 16
Views: 5355

Re: Choosing a GPU platform: AMD and Nvidia

What's unclear to me is the other architectural changes and how this impacts performance. You mean the new SMX Units and branch divergence? So researching the 680 better is worth it. I would wait until the GK110 is out...should be Q4 2012, AMD is going to release HD8000 Q4 2012 or Q1 2013, with pro...
by smatovic
Sat Jul 14, 2012 2:06 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Choosing a GPU platform: AMD and Nvidia
Replies: 16
Views: 5355

Re: Choosing a GPU platform: AMD and Nvidia

Looking for the Integer Throughput of different GPUs is a bit sophisticated... Meanwhile i could imagine that Nvidias Fermi, (4xx, 5xx) have more Integer Throughput than AMDs 7xxx... http://zeta-chess.blogspot.de/2012/07/integer-operations-on-gpus.html http://zeta-chess.blogspot.de/2012/07/about-nvi...
by smatovic
Sat Jul 14, 2012 8:28 am
Forum: Computer Chess Club: General Topics
Topic: Zeta 0970 - Alpha II Release
Replies: 11
Views: 2160

Re: Zeta 0970 - Alpha II Release

$cat zeta_cl.debug Error: Getting Platforms. (clGetPlatformsIDs) Zeta is unable to initialize the OpenCL platform from Nvidia. If you have the command "clinfo" on your box you could check if your "platform name" is "Nvidia".... Some older driver have no Platform-Information, i think with OpenCL 1.1...
by smatovic
Fri Jul 13, 2012 10:49 pm
Forum: Computer Chess Club: General Topics
Topic: Zeta 0970 - Alpha II Release
Replies: 11
Views: 2160

Re: Zeta 0970 - Alpha II Release

and i cant get it to work with Scid vs PC with Intel CPU or NV GPU. Does it run on the command line? >zeta.bin >new >go CPUs need some OpenCL-Driver, either Intel OpenCL SDK or AMD OpenCL SDK works for Intel CPUs SSE >= 4 too. For the 8400 GPU i suggest following setup,assuming you have 512 MB RAM:...
by smatovic
Fri Jul 13, 2012 10:32 pm
Forum: Computer Chess Club: General Topics
Topic: Zeta 0970 - Alpha II Release
Replies: 11
Views: 2160

Re: Zeta 0970 - Alpha II Release

Hmmm - it slows my box to a crawl Yepp, during GPU computation the box freezes :roll: and i cant get it to work with Scid vs PC. I ve tested only Xboard...will test it with Scid vs PC these days.... Probably my old gpu is no use anyway. NVIDIA GPU GeForce 8400 GS (G98) at PCI:1:0:0 (GPU-0) Yepp, 84...
by smatovic
Fri Jul 13, 2012 7:19 pm
Forum: Computer Chess Club: General Topics
Topic: Zeta 0970 - Alpha II Release
Replies: 11
Views: 2160

Re: Zeta 0970 - Alpha II Release

Just a noob question : How do you say an engine to run on the GPU instead of the CPU ?
in the file config.cfg you can specify which platform you want to use...if GPU or CPU...

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Srdja