From: Joost VandeVondele <Joost.VandeVondele@gmail.com>
Date: Tue, 6 Jun 2017 07:48:57 +0000 (+0200)
Subject: Call TT.new_search() earlier.
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=ebc563059c5fc103ca6d79edb04bb6d5f182eaf5

Call TT.new_search() earlier.

TT.new_search() was being called by mainThread in Thread::search(). However, mainThread is the last to start searching, and helper threads could reach a measured rootDepth 10 (on 64 cores) before mainThread increments the TT generation. Fixed by moving the call to MaintThread::search() before helper threads start searching.

No functional change.

Closes #1134
---

diff --git a/src/search.cpp b/src/search.cpp
index aafbf80f..8f3c4552 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -244,6 +244,7 @@ void MainThread::search() {
 
   Color us = rootPos.side_to_move();
   Time.init(Limits, us, rootPos.game_ply());
+  TT.new_search();
 
   int contempt = Options["Contempt"] * PawnValueEg / 100; // From centipawns
   DrawValue[ us] = VALUE_DRAW - Value(contempt);
@@ -347,7 +348,6 @@ void Thread::search() {
       EasyMove.clear();
       mainThread->easyMovePlayed = mainThread->failedLow = false;
       mainThread->bestMoveChanges = 0;
-      TT.new_search();
   }
 
   size_t multiPV = Options["MultiPV"];