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f9518de974
Increase size of the pawns table by the factor 8. This decreases the number of recalculations of pawn structure information significantly (at least at LTC).
I have done measurements for different depths and pawn cache sizes.
First are given the number of pawn entry calculations are done (in parentheses is the frequency that a call to probe triggers a pawn entry calculation). The delta% are the percentage of less done pawn entry calculations in comparison to master
VSTC: bench 1 1 12
STC: bench 8 1 16
LTC: bench 64 1 20
VLTC: bench 512 1 24
VSTC STC LTC VLTC
master 82218(6%) 548935(6%) 2415422(7%) 9548071(7%)
pawncache*2 79859(6%) 492943(5%) 2084794(6%) 8275206(6%)
pawncache*4 78551(6%) 458758(5%) 1827770(5%) 7112531(5%)
pawncache*8 77963(6%) 439421(4%) 1649169(5%) 6128652(4%)
delta%(p2-m) -2.9% -10.2% -13.7% -13.3%
delta%(p4-m) -4.5% -16.4% -24.3% -25.5%
delta%(p8-m) -5.2% -20.0% -31.7% -35.8%
STC: (non-regression test because at STC the effect is smaller than at LTC)
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 22767 W: 5160 L: 5040 D: 12567
http://tests.stockfishchess.org/tests/view/5d00f6040ebc5925cf09c3e2
LTC:
LLR: 2.94 (-2.94,2.94) [0.00,4.00]
Total: 26340 W: 4524 L: 4286 D: 17530
http://tests.stockfishchess.org/tests/view/5d00a3810ebc5925cf09ba16
No functional change.
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
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Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
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Copyright (C) 2015-2019 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef PAWNS_H_INCLUDED
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#define PAWNS_H_INCLUDED
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#include "misc.h"
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#include "position.h"
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#include "types.h"
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namespace Pawns {
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/// Pawns::Entry contains various information about a pawn structure. A lookup
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/// to the pawn hash table (performed by calling the probe function) returns a
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/// pointer to an Entry object.
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struct Entry {
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Score pawn_score(Color c) const { return scores[c]; }
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Bitboard pawn_attacks(Color c) const { return pawnAttacks[c]; }
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Bitboard passed_pawns(Color c) const { return passedPawns[c]; }
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Bitboard pawn_attacks_span(Color c) const { return pawnAttacksSpan[c]; }
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int passed_count() const { return popcount(passedPawns[WHITE] | passedPawns[BLACK]); }
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template<Color Us>
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Score king_safety(const Position& pos) {
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return kingSquares[Us] == pos.square<KING>(Us) && castlingRights[Us] == pos.castling_rights(Us)
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? kingSafety[Us] : (kingSafety[Us] = do_king_safety<Us>(pos));
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}
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template<Color Us>
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Score do_king_safety(const Position& pos);
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template<Color Us>
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void evaluate_shelter(const Position& pos, Square ksq, Score& shelter);
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Key key;
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Score scores[COLOR_NB];
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Bitboard passedPawns[COLOR_NB];
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Bitboard pawnAttacks[COLOR_NB];
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Bitboard pawnAttacksSpan[COLOR_NB];
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Square kingSquares[COLOR_NB];
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Score kingSafety[COLOR_NB];
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int castlingRights[COLOR_NB];
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};
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typedef HashTable<Entry, 131072> Table;
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Entry* probe(const Position& pos);
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} // namespace Pawns
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#endif // #ifndef PAWNS_H_INCLUDED
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