Search found 2317 matches

by mar
Wed Apr 21, 2021 10:33 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Thread overhead in C++
Replies: 6
Views: 218

Re: Thread overhead in C++

whaat? :) atomics are super-fast if no contention on x86, atomic load (no matter what ordering) is simply a mov reg, mem plus a compiler barrier before that! how is that slow?! since your thread only potentially stores each 5ms, no heavy contention is possible whatsoever I agree with marcel, just po...
by mar
Tue Apr 20, 2021 10:54 am
Forum: Computer Chess Club: General Topics
Topic: UCI_Elo 1500 engines and FIDE Elo
Replies: 24
Views: 805

Re: UCI_Elo 1500 engines and FIDE Elo

Ferdy, could you try Cheng 4.40 instead?
I think I fixed some minor problem with UCI_Elo (should play a bit weaker now, hopefully)
by mar
Thu Apr 15, 2021 6:13 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Split Index Super Set Yielding (SISSY) Bitboards
Replies: 74
Views: 11725

Re: Split Index Super Set Yielding (SISSY) Bitboards

Mike Sherwin wrote:
Wed Apr 14, 2021 2:59 am
YES,,,YES YES YES I dyxjubf did it!!!
congratulations, Michael. did you measure a performance gain for the bishop SISSY?
how big are the tables now?
by mar
Thu Apr 15, 2021 6:11 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: PST-only Evaluation for MinimalChess 0.4
Replies: 30
Views: 1546

Re: PST-only Evaluation for MinimalChess 0.4

Well, that is PeSTO itself, of course. And it has no Pawn evaluator. Just PST, as the name suggests. Then that is absolutely amazing! I would never have imagined that an engine with no more than static PST's could ever attain anywhere near a 3100 elo. :? well, 3100 elo but 4CPU - I get (most do in ...
by mar
Mon Apr 12, 2021 2:48 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Split Index Super Set Yielding (SISSY) Bitboards
Replies: 74
Views: 11725

Re: Split Index Super Set Yielding (SISSY) Bitboards

hi Michael,

I don't remember as it was several months ago. I believe I did nothing special but simply used a bigger LUT to process two ranks at once?
by mar
Sat Apr 10, 2021 3:33 pm
Forum: Computer Chess Club: General Topics
Topic: M1 Apple Silicon for Chess?
Replies: 371
Views: 44176

Re: M1 Apple Silicon for Chess?

not that I plan to waste my M1 on chess, but I might That sums it up, I suppose. The thread is "M1 Apple Silicon for chess". I have no personal grudge against any HW. I just think it is borderline fanboyism to compare HW and then don't optimize benches based on the HW used on more than one end. Of ...
by mar
Sat Apr 10, 2021 9:35 am
Forum: Computer Chess Club: General Topics
Topic: M1 Apple Silicon for Chess?
Replies: 371
Views: 44176

Re: M1 Apple Silicon for Chess?

Even according to your own benchmarks on your engine the inexpensive 2700x beats a spanking new M1.. So what is really to be impressed with?.. Yes.. Its a more power-consuming Desktop CPU... But its older and the more relevant comparison today is for example with a 5xxxU 15W AMD mobile CPU... are y...
by mar
Fri Apr 09, 2021 6:22 pm
Forum: Computer Chess Club: General Topics
Topic: M1 Apple Silicon for Chess?
Replies: 371
Views: 44176

Re: M1 Apple Silicon for Chess?

SMP results for my engine 19'725'019 nps, 2700X 16 threads 13'884'314 nps, 2700X 8 threads 17'497'848 nps, M1 8 threads perf diff (left is faster): desktop 16T vs desktop 8T: 1.42x (pretty good for hyperthreading) desktop 16T vs M1: 1.13x M1 vs desktop 8T: 1.26x so even the MT performance is not tha...
by mar
Fri Apr 09, 2021 5:53 pm
Forum: Computer Chess Club: General Topics
Topic: Can somebody with 6 men EGTB show how to win with White?
Replies: 14
Views: 1083

Re: Can somebody with 6 men EGTB show how to win with White?

Ethereal playing White Versus Igel playing with Black show an evaluation of 0.01 and Igel is showing an evaluation of 0.00. I am NOT using any chess Opening Nor EGTB for this test, Just pure engine evaluation where the two Engines have to show how good is there Opening knowledge and their endgame K...
by mar
Fri Apr 09, 2021 5:50 pm
Forum: Computer Chess Club: General Topics
Topic: M1 Apple Silicon for Chess?
Replies: 371
Views: 44176

Re: M1 Apple Silicon for Chess?

You don't care about the generation of HW and nm-size.. but you care enough only to compare single-core performance only?.. the M1 a) costs you more than an old 2018 2700x and b) the 2700x will still beat it for chess-engine benchmarks if you choose to use the full-chip. Per core benches are really...