Discussion of chess software programming and technical issues.
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Jouni
- Posts: 3392
- Joined: Wed Mar 08, 2006 8:15 pm
Post
by Jouni »
When testing different Berserk versions I was surprised how much avx2 can give:
Code: Select all
Score of berserk-12.1-avx2-pext vs berserk-12.1-ssse3: 105 - 69 - 226 [0.545]
... berserk-12.1-avx2-pext playing White: 105 - 0 - 95 [0.762] 200
... berserk-12.1-avx2-pext playing Black: 0 - 69 - 131 [0.328] 200
... White vs Black: 174 - 0 - 226 [0.718] 400
Elo difference: 31.4 +/- 22.4, LOS: 99.7 %, DrawRatio: 56.5 %
400 of 400 games finished.
Nps speed up is 27%. I was expecting minor gain at this level only.
Jouni
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Uri Blass
- Posts: 10444
- Joined: Thu Mar 09, 2006 12:37 am
- Location: Tel-Aviv Israel
Post
by Uri Blass »
Jouni wrote: ↑Sun Mar 31, 2024 9:35 pm
When testing different Berserk versions I was surprised how much avx2 can give:
Code: Select all
Score of berserk-12.1-avx2-pext vs berserk-12.1-ssse3: 105 - 69 - 226 [0.545]
... berserk-12.1-avx2-pext playing White: 105 - 0 - 95 [0.762] 200
... berserk-12.1-avx2-pext playing Black: 0 - 69 - 131 [0.328] 200
... White vs Black: 174 - 0 - 226 [0.718] 400
Elo difference: 31.4 +/- 22.4, LOS: 99.7 %, DrawRatio: 56.5 %
400 of 400 games finished.
Nps speed up is 27%. I was expecting minor gain at this level only.
What is the time control?
I guess you used UHO book(with unbiased book it is certainly smaller gain).
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Jouni
- Posts: 3392
- Joined: Wed Mar 08, 2006 8:15 pm
Post
by Jouni »
Yes UHO book and 20+0,2 level. Similar test with SF16.1. Bmi compile is 25% faster than sse41 compile. So Berserk no exception.
Code: Select all
Score of stockfish16.1 vs stockfish-sse41: 116 - 83 - 201 [0.541]
... stockfish16.1 playing White: 113 - 2 - 85 [0.777] 200
... stockfish16.1 playing Black: 3 - 81 - 116 [0.305] 200
... White vs Black: 194 - 5 - 201 [0.736] 400
Elo difference: 28.7 +/- 24.0, LOS: 99.0 %, DrawRatio: 50.2 %
400 of 400 games finished.
Jouni