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Code Issues Releases Wiki Activity

Simplify altering the search depth of the helper threads

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As a side-effect, the old iterative deepening loop
logic is being restored.

bench: 8116244 (after rebasing on new master)
This commit is contained in:
joergoster 2015-10-12 08:41:29 +02:00 • committed by Marco Costalba
parent 7b9e83f604
commit a75e45b37e
1 changed files with 4 additions and 19 deletions
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23
src/search.cpp
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@ -372,27 +372,12 @@ void Thread::search(bool isMainThread) {
multiPV = std::min(multiPV, rootMoves.size()); multiPV = std::min(multiPV, rootMoves.size());
// Iterative deepening loop until requested to stop or target depth reached // Iterative deepening loop until requested to stop or target depth reached
while (true) while (++depth < DEPTH_MAX && !Signals.stop && (!Limits.depth || depth <= Limits.depth))
{ {
// Set up our new depth // Set up our new depth for the helper threads
if (!isMainThread)
// The main thread modifies other threads rootDepth, if it is <= main
// thread depth. The new depth will take effect after the other thread
// returns to id_loop().
if (isMainThread)
{
++depth;
for (Thread* th : Threads)
if (th != this && th->depth <= depth)
th->depth = depth + Depth(int(3 * log(1 + th->idx)));
}
else
// This can cause a thread to search with the same depth for many iterations
depth = Threads.main()->depth + Depth(int(3 * log(1 + this->idx))); depth = Threads.main()->depth + Depth(int(3 * log(1 + this->idx)));
if (depth >= DEPTH_MAX || Signals.stop || (Limits.depth && depth > Limits.depth))
break;
// Age out PV variability metric // Age out PV variability metric
if (isMainThread) if (isMainThread)
BestMoveChanges *= 0.5; BestMoveChanges *= 0.5;
@ -479,7 +464,7 @@ void Thread::search(bool isMainThread) {
// Sort the PV lines searched so far and update the GUI // Sort the PV lines searched so far and update the GUI
std::stable_sort(rootMoves.begin(), rootMoves.begin() + PVIdx + 1); std::stable_sort(rootMoves.begin(), rootMoves.begin() + PVIdx + 1);
if (this != Threads.main()) if (!isMainThread)
break; break;
if (Signals.stop) if (Signals.stop)