TalkChess.com

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...

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.

Too young

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?

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...

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,...

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.

RubiChess wrote: ↑

Wed Nov 27, 2019 5:46 am

Remember that they still use last official SF10 for testing

They do not.

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.

>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.