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Code Issues Releases Wiki Activity

Shuffle aspiration window loop

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No functional change.
This commit is contained in:
Marco Costalba 2012-10-24 10:34:36 +02:00
parent 70b1b79264
commit 9c2b3faec4
1 changed files with 38 additions and 42 deletions
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80
src/search.cpp
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@ -91,6 +91,7 @@ namespace {
TimeManager TimeMgr;
int BestMoveChanges;
int SkillLevel;
Move skillBest;
bool SkillLevelEnabled, Chess960;
Value DrawValue[COLOR_NB];
History H;
@ -215,6 +216,7 @@ void Search::think() {
// Do we have to play with skill handicap? In this case enable MultiPV that
// we will use behind the scenes to retrieve a set of possible moves.
SkillLevelEnabled = (SkillLevel < 20);
skillBest = MOVE_NONE;
MultiPV = (SkillLevelEnabled ? std::max(UCIMultiPV, (size_t)4) : UCIMultiPV);
if (Options["Use Search Log"])
@ -246,6 +248,15 @@ void Search::think() {
Threads.set_timer(0); // Stop timer
Threads.sleep();
// When using skills swap best PV line with the sub-optimal one
if (SkillLevelEnabled)
{
if (skillBest == MOVE_NONE) // Still unassigned ?
skillBest = do_skill_level();
std::swap(RootMoves[0], *std::find(RootMoves.begin(), RootMoves.end(), skillBest));
}
if (Options["Use Search Log"])
{
Time::point elapsed = Time::now() - SearchTime + 1;
@ -287,7 +298,6 @@ namespace {
int depth, prevBestMoveChanges;
Value bestValue, alpha, beta, delta;
bool bestMoveNeverChanged = true;
Move skillBest = MOVE_NONE;
memset(ss, 0, 4 * sizeof(Stack));
depth = BestMoveChanges = 0;
@ -295,7 +305,7 @@ namespace {
ss->currentMove = MOVE_NULL; // Hack to skip update gains
// Iterative deepening loop until requested to stop or target depth reached
while (!Signals.stop && ++depth <= MAX_PLY && (!Limits.depth || depth <= Limits.depth))
while (++depth <= MAX_PLY && !Signals.stop && (!Limits.depth || depth <= Limits.depth))
{
// Save last iteration's scores before first PV line is searched and all
// the move scores but the (new) PV are set to -VALUE_INFINITE.
@ -337,37 +347,41 @@ namespace {
// the already searched PV lines are preserved.
sort<RootMove>(RootMoves.begin() + PVIdx, RootMoves.end());
// In case we have found an exact score and we are going to leave
// the fail high/low loop then reorder the PV moves, otherwise
// leave the last PV move in its position so to be searched again.
// Of course this is needed only in MultiPV search.
if (PVIdx && bestValue > alpha && bestValue < beta)
sort<RootMove>(RootMoves.begin(), RootMoves.begin() + PVIdx);
// Write PV back to transposition table in case the relevant
// entries have been overwritten during the search.
for (size_t i = 0; i <= PVIdx; i++)
RootMoves[i].insert_pv_in_tt(pos);
// If search has been stopped exit the aspiration window loop.
// Sorting and writing PV back to TT is safe becuase RootMoves
// is still valid, although refers to previous iteration.
// If search has been stopped return immediately. Sorting and
// writing PV back to TT is safe becuase RootMoves is still
// valid, although refers to previous iteration.
if (Signals.stop)
break;
// Send full PV info to GUI if we are going to leave the loop or
// if we have a fail high/low and we are deep in the search.
if ((bestValue > alpha && bestValue < beta) || Time::now() - SearchTime > 2000)
sync_cout << uci_pv(pos, depth, alpha, beta) << sync_endl;
return;
// In case of failing high/low increase aspiration window and
// research, otherwise exit the fail high/low loop.
if (bestValue >= beta)
// research, otherwise sort multi-PV lines and exit the loop.
if (bestValue > alpha && bestValue < beta)
{
sort<RootMove>(RootMoves.begin(), RootMoves.begin() + PVIdx);
sync_cout << uci_pv(pos, depth, alpha, beta) << sync_endl;
break;
}
// Give some update (without cluttering the UI) before to research
if (Time::now() - SearchTime > 3000)
sync_cout << uci_pv(pos, depth, alpha, beta) << sync_endl;
if (abs(bestValue) >= VALUE_KNOWN_WIN)
{
alpha = -VALUE_INFINITE;
beta = VALUE_INFINITE;
}
else if (bestValue >= beta)
{
beta += delta;
delta += delta / 2;
}
else if (bestValue <= alpha)
else
{
Signals.failedLowAtRoot = true;
Signals.stopOnPonderhit = false;
@ -375,15 +389,6 @@ namespace {
alpha -= delta;
delta += delta / 2;
}
else
break;
// Search with full window in case we have a win/mate score
if (abs(bestValue) >= VALUE_KNOWN_WIN)
{
alpha = -VALUE_INFINITE;
beta = VALUE_INFINITE;
}
assert(alpha >= -VALUE_INFINITE && beta <= VALUE_INFINITE);
}
@ -393,7 +398,7 @@ namespace {
if (SkillLevelEnabled && depth == 1 + SkillLevel)
skillBest = do_skill_level();
if (!Signals.stop && Options["Use Search Log"])
if (Options["Use Search Log"])
{
Log log(Options["Search Log Filename"]);
log << pretty_pv(pos, depth, bestValue, Time::now() - SearchTime, &RootMoves[0].pv[0])
@ -405,7 +410,7 @@ namespace {
bestMoveNeverChanged = false;
// Do we have time for the next iteration? Can we stop searching now?
if (!Signals.stop && !Signals.stopOnPonderhit && Limits.use_time_management())
if (Limits.use_time_management() && !Signals.stopOnPonderhit)
{
bool stop = false; // Local variable, not the volatile Signals.stop
@ -447,15 +452,6 @@ namespace {
}
}
}
// When using skills swap best PV line with the sub-optimal one
if (SkillLevelEnabled)
{
if (skillBest == MOVE_NONE) // Still unassigned ?
skillBest = do_skill_level();
std::swap(RootMoves[0], *std::find(RootMoves.begin(), RootMoves.end(), skillBest));
}
}
@ -821,8 +817,8 @@ split_point_start: // At split points actual search starts from here
// on all the other moves but the ttMove, if result is lower than ttValue minus
// a margin then we extend ttMove.
if ( singularExtensionNode
&& !ext
&& move == ttMove
&& !ext
&& pos.pl_move_is_legal(move, ci.pinned)
&& abs(ttValue) < VALUE_KNOWN_WIN)
{