Search found 608 matches

by chrisw
Mon Aug 12, 2019 8:49 am
Forum: Computer Chess Club: General Topics
Topic: 237 Mn/s for Stockfish on an 2xEPYC 7742
Replies: 20
Views: 1045

Re: 237 Mn/s for Stockfish on an 2xEPYC 7742

Werewolf wrote:
Sun Aug 11, 2019 7:59 pm
Surpassing Deep Blue's 200 Million nps.

But 22 years later...
also, just for reference, first microprocessor chess programs, Z80, 6502, back in 1980, 1981 were doing around 300 nps.

Factor of about a million in 40 years by general purpose CPU/software combination.
by chrisw
Mon Aug 12, 2019 8:29 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Bitboard logic: identifying 4 squares in a block
Replies: 8
Views: 534

Re: Bitboard logic: identifying 4 squares in a block

Let me elaborate. - - - - - - - - x x - - - - - x x - - - - - - - - - - - - - - - - - - The diagram above shows 4 'on' bits adjacent to each other in the shape of a square. There might be additional bits "touching" these four, the test is, is there ANY 4 bits in this pattern. Mobmat wrote earlier p...
by chrisw
Fri Jul 26, 2019 10:36 am
Forum: Computer Chess Club: General Topics
Topic: GPU recommendation needed
Replies: 13
Views: 989

Re: GPU recommendation needed

What would be good would be for CPU and GPU to be able to share the same RAM, also to be on the same chip. Yes, there are different approaches for shared memory and lower latency, e.g. https://en.wikipedia.org/wiki/Coherent_Accelerator_Processor_Interface I guess with the upcoming Exa-FLOP super co...
by chrisw
Fri Jul 26, 2019 8:08 am
Forum: Computer Chess Club: General Topics
Topic: GPU recommendation needed
Replies: 13
Views: 989

Re: GPU recommendation needed

What would be good would be for CPU and GPU to be able to share the same RAM, also to be on the same chip. Yes, there are different approaches for shared memory and lower latency, e.g. https://en.wikipedia.org/wiki/Coherent_Accelerator_Processor_Interface I guess with the upcoming Exa-FLOP super co...
by chrisw
Fri Jul 26, 2019 7:17 am
Forum: Computer Chess Club: General Topics
Topic: GPU recommendation needed
Replies: 13
Views: 989

Re: GPU recommendation needed

I have a dual-Xeon system with 2 Intel Xeon E5-2686-V3 cores or 2 X 18 = 36 cores total. I would like to add a decent GPU card so as to test lc0 but not reach for the top (GTX 2080). What would be recommended in terms of a value purchase: GTX 2070; GTX 2070S; or is there an AMD GPU I should look at...
by chrisw
Thu Jul 25, 2019 6:47 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Model to C code converter
Replies: 0
Views: 794

Model to C code converter

Anyone tried this out? Looks useful if it works. https://www.aitransformer.com/ What is AI Transformer? The journey of an AI project is an iterative one. Developers use high-level languages like Python to quickly prototype and test models, but need to convert to C code for deployment to the real wor...
by chrisw
Thu Jul 25, 2019 2:32 pm
Forum: Computer Chess Club: General Topics
Topic: Math question
Replies: 34
Views: 2619

Re: Math question

can't tell you "how much" non-determination there is built in LCZero, but the MCTS policy move chooser has a randomisation built into the algorithm, such that first move from unseen position is (usually) random chosen (or last time I looked). And this random choice first move will have a definite r...
by chrisw
Wed Jul 24, 2019 11:09 am
Forum: Computer Chess Club: General Topics
Topic: Is the 320x24b larger net the strongest around for RTX GPU?
Replies: 63
Views: 3677

Re: Is the 320x24b larger net the strongest around for RTX GPU?

... If some people are getting memory leaks and some not, this might be down to the NN handling software, how it deals with situations where available GPU memory comes under pressure, either by having too little GPU RAM or by LCZero parameter settings being too GPU RAM greedy. NN handler software t...
by chrisw
Wed Jul 24, 2019 11:07 am
Forum: Computer Chess Club: General Topics
Topic: future of top engines:how much more elo?
Replies: 124
Views: 10745

Re: future of top engines:how much more elo?

If a random moving engine played an infinite number of games against SF, some of the games would be wins for the random engine. Obviously, a very tiny percentage. But, just by chance, a win could happen early in the chain. A random engine will not be zero Elo. An engine that chooses the worst possi...
by chrisw
Wed Jul 24, 2019 10:41 am
Forum: Computer Chess Club: General Topics
Topic: Is the 320x24b larger net the strongest around for RTX GPU?
Replies: 63
Views: 3677

Re: Is the 320x24b larger net the strongest around for RTX GPU?

... I need, when using 2xRTX 2080 Ti GPUs, 64 GB RAM for 1 hour. =640 GB for 10 hours =1280 GB for 20 hours. =1536 GB for 24 hours. =Threadripper with 2 TB RAM makes sense :mrgreen:. This is the sad reality... I have been doing a run now for 5 1/2 hours on the same position. What is suppose to happ...