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Fix LazySMP when searching to a fixed depth. 

Currently, helper threads will only search up to the
specified depth limit. Now let them search until the
main thread has finished the specified depth.

On the other hand, we don't want to pick a thread with
a higher search depth.

This may be considered cheating. ;-)

No functional change.
pull/661/merge
joergoster 2016-04-30 10:56:00 +02:00 committed by Marco Costalba
parent 2dd24dc4e6
commit dc0030de4f
1 changed files with 3 additions and 2 deletions
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5
src/search.cpp
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@ -350,6 +350,7 @@ void MainThread::search() {
Thread* bestThread = this;
if ( !this->easyMovePlayed
&& Options["MultiPV"] == 1
&& !Limits.depth
&& !Skill(Options["Skill Level"]).enabled()
&& rootMoves[0].pv[0] != MOVE_NONE)
{
@ -411,7 +412,7 @@ void Thread::search() {
multiPV = std::min(multiPV, rootMoves.size());
// Iterative deepening loop until requested to stop or the target depth is reached.
while (++rootDepth < DEPTH_MAX && !Signals.stop && (!Limits.depth || rootDepth <= Limits.depth))
while (++rootDepth < DEPTH_MAX && !Signals.stop && (!Limits.depth || Threads.main()->rootDepth <= Limits.depth))
{
// Set up the new depths for the helper threads skipping on average every
// 2nd ply (using a half-density matrix).
@ -1006,7 +1007,7 @@ moves_loop: // When in check search starts from here
Depth r = reduction<PvNode>(improving, depth, moveCount);
Value hValue = thisThread->history[pos.piece_on(to_sq(move))][to_sq(move)];
Value cmhValue = cmh[pos.piece_on(to_sq(move))][to_sq(move)];
const CounterMoveStats* fm = (ss - 2)->counterMoves;
const CounterMoveStats* fm2 = (ss - 4)->counterMoves;
Value fmValue = (fm ? (*fm)[pos.piece_on(to_sq(move))][to_sq(move)] : VALUE_ZERO);