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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2026 The Stockfish developers (see AUTHORS file)
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "engine.h"
#include <algorithm>
#include <cassert>
#include <deque>
#include <iosfwd>
#include <memory>
#include <ostream>
#include <sstream>
#include <string_view>
#include <utility>
#include <vector>
#include "evaluate.h"
#include "misc.h"
#include "nnue/network.h"
#include "nnue/nnue_common.h"
#include "nnue/nnue_misc.h"
#include "numa.h"
#include "perft.h"
#include "position.h"
#include "search.h"
#include "shm.h"
#include "syzygy/tbprobe.h"
#include "types.h"
#include "uci.h"
#include "ucioption.h"
namespace Stockfish {
namespace NN = Eval::NNUE;
constexpr int MaxHashMB = Is64Bit ? 33554432 : 2048;
int MaxThreads = std::max(1024, 4 * int(get_hardware_concurrency()));
// The default configuration will attempt to group L3 domains up to 32 threads.
// This size was found to be a good balance between the Elo gain of increased
// history sharing and the speed loss from more cross-cache accesses (see
// PR#6526). The user can always explicitly override this behavior.
constexpr NumaAutoPolicy DefaultNumaPolicy = BundledL3Policy{32};
Engine::Engine(std::optional<std::string> path) :
binaryDirectory(path ? CommandLine::get_binary_directory(*path) : ""),
numaContext(NumaConfig::from_system(DefaultNumaPolicy)),
states(new std::deque<StateInfo>(1)),
threads(),
networks(numaContext, get_default_networks()) {
pos.set(StartFEN, false, &states->back());
options.add( //
"Debug Log File", Option("", [](const Option& o) {
start_logger(o);
return std::nullopt;
}));
options.add( //
"NumaPolicy", Option("auto", [this](const Option& o) {
set_numa_config_from_option(o);
return numa_config_information_as_string() + "\n"
+ thread_allocation_information_as_string();
}));
options.add( //
"Threads", Option(1, 1, MaxThreads, [this](const Option&) {
resize_threads();
return thread_allocation_information_as_string();
}));
options.add( //
"Hash", Option(16, 1, MaxHashMB, [this](const Option& o) {
set_tt_size(o);
return std::nullopt;
}));
options.add( //
"Clear Hash", Option([this](const Option&) {
search_clear();
return std::nullopt;
}));
options.add( //
"Ponder", Option(false));
options.add( //
"MultiPV", Option(1, 1, MAX_MOVES));
options.add("Skill Level", Option(20, 0, 20));
options.add("Move Overhead", Option(10, 0, 5000));
options.add("nodestime", Option(0, 0, 10000));
options.add("UCI_Chess960", Option(false));
options.add("UCI_LimitStrength", Option(false));
options.add("UCI_Elo",
Option(Stockfish::Search::Skill::LowestElo, Stockfish::Search::Skill::LowestElo,
Stockfish::Search::Skill::HighestElo));
options.add("UCI_ShowWDL", Option(false));
options.add( //
"SyzygyPath", Option("", [](const Option& o) {
Tablebases::init(o);
return std::nullopt;
}));
options.add("SyzygyProbeDepth", Option(1, 1, 100));
options.add("Syzygy50MoveRule", Option(true));
options.add("SyzygyProbeLimit", Option(7, 0, 7));
options.add( //
"EvalFile", Option(EvalFileDefaultNameBig, [this](const Option& o) {
load_big_network(o);
return std::nullopt;
}));
options.add( //
"EvalFileSmall", Option(EvalFileDefaultNameSmall, [this](const Option& o) {
load_small_network(o);
return std::nullopt;
}));
threads.clear();
threads.ensure_network_replicated();
resize_threads();
}
std::uint64_t Engine::perft(const std::string& fen, Depth depth, bool isChess960) {
verify_networks();
return Benchmark::perft(fen, depth, isChess960);
}
void Engine::go(Search::LimitsType& limits) {
assert(limits.perft == 0);
verify_networks();
threads.start_thinking(options, pos, states, limits);
}
void Engine::stop() { threads.stop = true; }
void Engine::search_clear() {
wait_for_search_finished();
tt.clear(threads);
threads.clear();
// @TODO wont work with multiple instances
Tablebases::init(options["SyzygyPath"]); // Free mapped files
}
void Engine::set_on_update_no_moves(std::function<void(const Engine::InfoShort&)>&& f) {
updateContext.onUpdateNoMoves = std::move(f);
}
void Engine::set_on_update_full(std::function<void(const Engine::InfoFull&)>&& f) {
updateContext.onUpdateFull = std::move(f);
}
void Engine::set_on_iter(std::function<void(const Engine::InfoIter&)>&& f) {
updateContext.onIter = std::move(f);
}
void Engine::set_on_bestmove(std::function<void(std::string_view, std::string_view)>&& f) {
updateContext.onBestmove = std::move(f);
}
void Engine::set_on_verify_networks(std::function<void(std::string_view)>&& f) {
onVerifyNetworks = std::move(f);
}
void Engine::wait_for_search_finished() { threads.main_thread()->wait_for_search_finished(); }
std::optional<PositionSetError> Engine::set_position(const std::string& fen,
const std::vector<std::string>& moves) {
// Drop the old state and create a new one
states = StateListPtr(new std::deque<StateInfo>(1));
auto err = pos.set(fen, options["UCI_Chess960"], &states->back());
if (err.has_value())
return err;
for (const auto& move : moves)
{
auto m = UCIEngine::to_move(pos, move);
if (m == Move::none())
return PositionSetError("Illegal move: " + move);
states->emplace_back();
pos.do_move(m, states->back());
}
return std::nullopt;
}
// modifiers
void Engine::set_numa_config_from_option(const std::string& o) {
if (o == "auto" || o == "system")
{
numaContext.set_numa_config(NumaConfig::from_system(DefaultNumaPolicy));
}
else if (o == "hardware")
{
// Don't respect affinity set in the system.
numaContext.set_numa_config(NumaConfig::from_system(DefaultNumaPolicy, false));
}
else if (o == "none")
{
numaContext.set_numa_config(NumaConfig{});
}
else
{
numaContext.set_numa_config(NumaConfig::from_string(o));
}
// Force reallocation of threads in case affinities need to change.
resize_threads();
threads.ensure_network_replicated();
}
void Engine::resize_threads() {
threads.wait_for_search_finished();
threads.set(numaContext.get_numa_config(), {options, threads, tt, sharedHists, networks},
updateContext);
// Reallocate the hash with the new threadpool size
set_tt_size(options["Hash"]);
threads.ensure_network_replicated();
}
void Engine::set_tt_size(size_t mb) {
wait_for_search_finished();
tt.resize(mb, threads);
}
void Engine::set_ponderhit(bool b) { threads.main_manager()->ponder = b; }
// network related
void Engine::verify_networks() const {
networks->big.verify(options["EvalFile"], onVerifyNetworks);
networks->small.verify(options["EvalFileSmall"], onVerifyNetworks);
auto statuses = networks.get_status_and_errors();
for (size_t i = 0; i < statuses.size(); ++i)
{
const auto [status, error] = statuses[i];
std::string message = "Network replica " + std::to_string(i + 1) + ": ";
if (status == SystemWideSharedConstantAllocationStatus::NoAllocation)
{
message += "No allocation.";
}
else if (status == SystemWideSharedConstantAllocationStatus::LocalMemory)
{
message += "Local memory.";
}
else if (status == SystemWideSharedConstantAllocationStatus::SharedMemory)
{
message += "Shared memory.";
}
else
{
message += "Unknown status.";
}
if (error.has_value())
{
message += " " + *error;
}
onVerifyNetworks(message);
}
}
std::unique_ptr<Eval::NNUE::Networks> Engine::get_default_networks() const {
auto networks_ =
std::make_unique<NN::Networks>(NN::EvalFile{EvalFileDefaultNameBig, "None", ""},
NN::EvalFile{EvalFileDefaultNameSmall, "None", ""});
networks_->big.load(binaryDirectory, "");
networks_->small.load(binaryDirectory, "");
return networks_;
}
void Engine::load_big_network(const std::string& file) {
networks.modify_and_replicate(
[this, &file](NN::Networks& networks_) { networks_.big.load(binaryDirectory, file); });
threads.clear();
threads.ensure_network_replicated();
}
void Engine::load_small_network(const std::string& file) {
networks.modify_and_replicate(
[this, &file](NN::Networks& networks_) { networks_.small.load(binaryDirectory, file); });
threads.clear();
threads.ensure_network_replicated();
}
void Engine::save_network(const std::pair<std::optional<std::string>, std::string> files[2]) {
networks.modify_and_replicate([&files](NN::Networks& networks_) {
networks_.big.save(files[0].first);
networks_.small.save(files[1].first);
});
}
// utility functions
void Engine::trace_eval() const {
StateListPtr trace_states(new std::deque<StateInfo>(1));
Position p;
p.set(pos.fen(), options["UCI_Chess960"], &trace_states->back());
verify_networks();
sync_cout << "\n" << Eval::trace(p, *networks) << sync_endl;
}
const OptionsMap& Engine::get_options() const { return options; }
OptionsMap& Engine::get_options() { return options; }
std::string Engine::fen() const { return pos.fen(); }
void Engine::flip() { pos.flip(); }
std::string Engine::visualize() const {
std::stringstream ss;
ss << pos;
return ss.str();
}
int Engine::get_hashfull(int maxAge) const { return tt.hashfull(maxAge); }
std::vector<std::pair<size_t, size_t>> Engine::get_bound_thread_count_by_numa_node() const {
auto counts = threads.get_bound_thread_count_by_numa_node();
const NumaConfig& cfg = numaContext.get_numa_config();
std::vector<std::pair<size_t, size_t>> ratios;
NumaIndex n = 0;
for (; n < counts.size(); ++n)
ratios.emplace_back(counts[n], cfg.num_cpus_in_numa_node(n));
if (!counts.empty())
for (; n < cfg.num_numa_nodes(); ++n)
ratios.emplace_back(0, cfg.num_cpus_in_numa_node(n));
return ratios;
}
std::string Engine::get_numa_config_as_string() const {
return numaContext.get_numa_config().to_string();
}
std::string Engine::numa_config_information_as_string() const {
auto cfgStr = get_numa_config_as_string();
return "Available processors: " + cfgStr;
}
std::string Engine::thread_binding_information_as_string() const {
auto boundThreadsByNode = get_bound_thread_count_by_numa_node();
std::stringstream ss;
if (boundThreadsByNode.empty())
return ss.str();
bool isFirst = true;
for (auto&& [current, total] : boundThreadsByNode)
{
if (!isFirst)
ss << ":";
ss << current << "/" << total;
isFirst = false;
}
return ss.str();
}
std::string Engine::thread_allocation_information_as_string() const {
std::stringstream ss;
size_t threadsSize = threads.size();
ss << "Using " << threadsSize << (threadsSize > 1 ? " threads" : " thread");
auto boundThreadsByNodeStr = thread_binding_information_as_string();
if (boundThreadsByNodeStr.empty())
return ss.str();
ss << " with NUMA node thread binding: ";
ss << boundThreadsByNodeStr;
return ss.str();
}
}
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