From: joergoster <osterj165@googlemail.com>
Date: Sat, 30 Apr 2016 08:56:00 +0000 (+0200)
Subject: Fix LazySMP when searching to a fixed depth.
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=dc0030de4fdece2851dd0072c9aea53695ed90ce;hp=2dd24dc4e618dc7b83799890fe7e84b09b6456b4

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.
---

diff --git a/src/search.cpp b/src/search.cpp
index a50f7990..6b894956 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -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);