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Introduce yielding spin locks

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Idea and original implementation by Stephane Nicolet

7 threads 15+0.05
ELO: 3.54 +-2.9 (95%) LOS: 99.2%
Total: 17971 W: 2976 L: 2793 D: 12202

There is no functional change in single thread mode
This commit is contained in:
Joona Kiiski
2015-03-12 20:36:32 +00:00
parent 558b0c848c
commit d71f707040
3 changed files with 21 additions and 6 deletions
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7
src/thread.cpp
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@@ -174,17 +174,18 @@ void Thread::split(Position& pos, Stack* ss, Value alpha, Value beta, Value* bes
while ( sp.slavesMask.count() < MAX_SLAVES_PER_SPLITPOINT
&& (slave = Threads.available_slave(&sp)) != nullptr)
{
slave->mutex.lock();
slave->allocMutex.lock();
if (slave->can_join(activeSplitPoint))
{
activeSplitPoint->slavesMask.set(slave->idx);
slave->activeSplitPoint = activeSplitPoint;
slave->searching = true;
slave->sleepCondition.notify_one(); // Could be sleeping
}
slave->mutex.unlock();
slave->allocMutex.unlock();
slave->notify_one(); // Could be sleeping
}
// Everything is set up. The master thread enters the idle loop, from which