Search found 1146 matches

by Gian-Carlo Pascutto
Thu Jun 04, 2020 11:29 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Total noob Leela question
Replies: 12
Views: 1154

Re: Total noob Leela question

So far I have payed zero attention to the LeelaChess Zero project, as I have no good GPU. But now I want to do some testing at ultra-low node count, and I suppose a CPU-only version would be good enough for that. What would I have to do to run a game with LC0-CPU as UCI engine? I downloaded an arch...
by Gian-Carlo Pascutto
Mon Jun 01, 2020 2:50 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Ryzen 2 and BMI2?
Replies: 41
Views: 6900

Re: Ryzen 2 and BMI2?

Gerd Isenberg wrote:
Sat May 30, 2020 4:21 pm
I agree it is a shame, that Zen is so slow with pext. AMD has to spent some transistors for a fast hardware pext in one cycle!
Note that Intel has several patents on the efficient implementation of those instructions.
by Gian-Carlo Pascutto
Fri May 29, 2020 8:56 pm
Forum: Computer Chess Club: General Topics
Topic: Marcel van Kervinck
Replies: 18
Views: 1623

Re: Marcel van Kervinck

Too young :(
by Gian-Carlo Pascutto
Fri May 29, 2020 8:40 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Ryzen 2 and BMI2?
Replies: 41
Views: 6900

Re: Ryzen 2 and BMI2?

I tried to emulate PEXT in software and that runs faster as the native CPU instruction.
Do you have a fast implementation that you'd want to make public domain?
by Gian-Carlo Pascutto
Sat Jan 18, 2020 8:06 am
Forum: Computer Chess Club: General Topics
Topic: The Stockfish of shogi
Replies: 28
Views: 5114

Re: The Stockfish of shogi

I don't speak Japanese but their architecture seems to be: W1 = 125388 x 256 W2 = 512 x 32 W3 = 32 x 32 W4 = 32 x 1 And I can make some educated guesses: they exploit the fact that W1 doesn't change much to compute the result of that layer incrementally, which is coincidentally the heaviest layer. T...
by Gian-Carlo Pascutto
Tue Dec 10, 2019 5:28 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: PEXT/PDEP are even slower than you think on Zen
Replies: 12
Views: 2369

Re: PEXT/PDEP are even slower than you think on Zen

Another consideration is noise, the 180W thermals from the 10980XE can be cooled down very quietly with a Noctua NH-D15, I have two systems with these running and I can hardly hear that they are turned on. For a TR3-3970X you will start at 280W (probably even more), a 64 core TR3 will be like 500W,...
by Gian-Carlo Pascutto
Mon Dec 09, 2019 5:06 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: PEXT/PDEP are even slower than you think on Zen
Replies: 12
Views: 2369

PEXT/PDEP are even slower than you think on Zen

https://twitter.com/trav_downs/status/1 ... 7962364928

It was already known they were slow, but I didn't see anyone point out before that how slow they get actually depends on the argument.
by Gian-Carlo Pascutto
Wed Nov 27, 2019 7:19 am
Forum: Computer Chess Club: General Topics
Topic: w49921 net
Replies: 29
Views: 3651

Re: w49921 net

RubiChess wrote:
Wed Nov 27, 2019 5:46 am
Remember that they still use last official SF10 for testing
They do not.
by Gian-Carlo Pascutto
Tue Nov 26, 2019 8:44 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: CCRL 40/40, 40/4 and FRC lists updated (23rd November 2019)
Replies: 22
Views: 3658

Re: CCRL 40/40, 40/4 and FRC lists updated (23rd November 2019)

Jouni wrote:
Mon Nov 25, 2019 5:15 pm
Chessbase don't waste time https://en.chessbase.com/post/optimizing-fat-fritz .
I am sure Albert Silver (who wrote the article) is very proud he wrote the strongest engine in the world.
by Gian-Carlo Pascutto
Mon Nov 25, 2019 1:40 pm
Forum: Computer Chess Club: General Topics
Topic: Anyone heared of MuZero ?
Replies: 3
Views: 741

Re: Anyone heared of MuZero ?

>Assuming the "steps" they refer to are games

It's training steps of 2048 minibatches. I don't see any mention of games - they run the processes asynchronously. But it seems they generated about 20 billion positions. So, probably quite a bit more than a million games.