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 Stockfish Claiming Big Elo gains at VLTC and more threads.

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mwyoung

mwyoung


Posts : 880
Join date : 2020-11-25
Location : USA

Stockfish Claiming Big Elo gains at VLTC and more threads.  Empty
PostSubject: Stockfish Claiming Big Elo gains at VLTC and more threads.    Stockfish Claiming Big Elo gains at VLTC and more threads.  EmptySat Feb 25, 2023 5:01 pm

It would be great if Stockfish is fixing the thread and VLTC issues.

We will test and see how it performs in real games.

Author: Michael Chaly
Date: Fri Feb 24 20:14:44 2023 +0100
Timestamp: 1677266084

Search tuning at very long time control

This patch is a result of tuning session of approximately 100k games at 120+1.2.
Biggest changes are in extensions, stat bonus and depth reduction for nodes without a tt move.

Failed STC:
https://tests.stockfishchess.org/tests/view/63f72c72e74a12625bcd7938
LLR: -2.94 (-2.94,2.94) <0.00,2.00>
Total: 13872 W: 3535 L: 3769 D: 6568 Elo -5.86
Ptnml(0-2): 56, 1621, 3800, 1419, 40

Close to neutral at LTC:
https://tests.stockfishchess.org/tests/view/63f738f5e74a12625bcd7b8a
Elo: 0.80 +-1.2 (95%) LOS: 90.0%
Total: 60000 W: 16213 L: 16074 D: 27713 Elo +0.80
Ptnml(0-2): 24, 5718, 18379, 5853, 26
nElo: 1.82 +-2.8 (95%) PairsRatio: 1.02

Passed 180+1.8 VLTC:
https://tests.stockfishchess.org/tests/view/63f868f3e74a12625bcdb33e
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 15864 W: 4449 L: 4202 D: 7213 Elo +5.41
Ptnml(0-2): 1, 1301, 5083, 1544, 3

Passed 60+0.6 8 threads SMP VLTC:
https://tests.stockfishchess.org/tests/view/63f8a5d6e74a12625bcdbdb3
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 6288 W: 1821 L: 1604 D: 2863 Elo +11.99
Ptnml(0-2): 0, 402, 2123, 619, 0

closes https://github.com/official-stockfish/Stockfish/pull/4406

bench 4705194
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Chris Whittington




Posts : 1254
Join date : 2020-11-17
Location : France

Stockfish Claiming Big Elo gains at VLTC and more threads.  Empty
PostSubject: Re: Stockfish Claiming Big Elo gains at VLTC and more threads.    Stockfish Claiming Big Elo gains at VLTC and more threads.  EmptySat Feb 25, 2023 5:13 pm

mwyoung wrote:
It would be great if Stockfish is fixing the thread and VLTC issues.

We will test and see how it performs in real games.

Author: Michael Chaly
Date: Fri Feb 24 20:14:44 2023 +0100
Timestamp: 1677266084

Search tuning at very long time control

This patch is a result of tuning session of approximately 100k games at 120+1.2.
Biggest changes are in extensions, stat bonus and depth reduction for nodes without a tt move.

Failed STC:
https://tests.stockfishchess.org/tests/view/63f72c72e74a12625bcd7938
LLR: -2.94 (-2.94,2.94) <0.00,2.00>
Total: 13872 W: 3535 L: 3769 D: 6568 Elo -5.86
Ptnml(0-2): 56, 1621, 3800, 1419, 40

Close to neutral at LTC:
https://tests.stockfishchess.org/tests/view/63f738f5e74a12625bcd7b8a
Elo: 0.80 +-1.2 (95%) LOS: 90.0%
Total: 60000 W: 16213 L: 16074 D: 27713 Elo +0.80
Ptnml(0-2): 24, 5718, 18379, 5853, 26
nElo: 1.82 +-2.8 (95%) PairsRatio: 1.02

Passed 180+1.8 VLTC:
https://tests.stockfishchess.org/tests/view/63f868f3e74a12625bcdb33e
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 15864 W: 4449 L: 4202 D: 7213 Elo +5.41
Ptnml(0-2): 1, 1301, 5083, 1544, 3

Passed 60+0.6 8 threads SMP VLTC:
https://tests.stockfishchess.org/tests/view/63f8a5d6e74a12625bcdbdb3
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 6288 W: 1821 L: 1604 D: 2863 Elo +11.99
Ptnml(0-2): 0, 402, 2123, 619, 0

closes https://github.com/official-stockfish/Stockfish/pull/4406

bench 4705194


My bad maths says 400 days of tuning tests. 4 days per 100 threads. Difficult for the rest of us to compete with that.
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Admin
Admin
Admin


Posts : 2522
Join date : 2020-11-17
Location : Netherlands

Stockfish Claiming Big Elo gains at VLTC and more threads.  Empty
PostSubject: Re: Stockfish Claiming Big Elo gains at VLTC and more threads.    Stockfish Claiming Big Elo gains at VLTC and more threads.  EmptySat Feb 25, 2023 5:15 pm

Became time they invested in LTC testing, after all they have the hardware for it.


Last edited by Admin on Sat Feb 25, 2023 7:05 pm; edited 1 time in total (Reason for editing : typo)
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http://rebel13.nl/
mwyoung

mwyoung


Posts : 880
Join date : 2020-11-25
Location : USA

Stockfish Claiming Big Elo gains at VLTC and more threads.  Empty
PostSubject: Re: Stockfish Claiming Big Elo gains at VLTC and more threads.    Stockfish Claiming Big Elo gains at VLTC and more threads.  EmptySat Feb 25, 2023 6:55 pm

Benchmark test, and scaling using the AMD 5900HX CPU, 8 core 16 threads.
For Stockfish dev-20230224.

Setting and scores. [bench hash threads searchdepth]

bench 1024 1 30
518,702 ms.
2,377,606 nps.

bench 1024 2 30
406,518 ms.
4,920,720 nps.

bench 1024 4 30
364,875 ms.
9,699,987 nps.

bench 1024 8 30
361,231 ms.
18,020,574 nps.

bench 1024 16 30
444,305 ms.
24,462,641 nps.

Results.

Only a 44% speedup going from 1 to 8 cores. And again using more threads then cores is not recommended with Stockfish. Regardless of the huge speedup in nodes per second, 8 core solve time 361,231 ms. vs 16 thread solve time 444,305 ms.
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PostSubject: Re: Stockfish Claiming Big Elo gains at VLTC and more threads.    Stockfish Claiming Big Elo gains at VLTC and more threads.  Empty

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