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Split also if no slaves are found

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Because we test for available slaves before
entering split(), we almost always allocate a
slave, only in the rare case of a race (less
then 2% of cases) this is not true, but to
special case this occurrence is not worth
the added complexity.

bench: 7451319
This commit is contained in:
Marco Costalba 2014-03-15 23:43:35 +01:00
parent a1a7bc84da
commit a091ae4cc8
1 changed files with 21 additions and 27 deletions
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10
src/thread.cpp
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@ -296,12 +296,9 @@ void Thread::split(Position& pos, const Stack* ss, Value alpha, Value beta, Valu
activeSplitPoint = &sp; activeSplitPoint = &sp;
activePosition = NULL; activePosition = NULL;
int slavesCnt = 1; // This thread is always included if (!Fake)
Thread* slave; for (Thread* slave; (slave = Threads.available_slave(this)) != NULL; )
while (!Fake && (slave = Threads.available_slave(this)) != NULL)
{ {
++slavesCnt;
sp.slavesMask |= 1ULL << slave->idx; sp.slavesMask |= 1ULL << slave->idx;
slave->activeSplitPoint = &sp; slave->activeSplitPoint = &sp;
slave->searching = true; // Slave leaves idle_loop() slave->searching = true; // Slave leaves idle_loop()
@ -312,8 +309,6 @@ void Thread::split(Position& pos, const Stack* ss, Value alpha, Value beta, Valu
// it will instantly launch a search, because its 'searching' flag is set. // it will instantly launch a search, because its 'searching' flag is set.
// The thread will return from the idle loop when all slaves have finished // The thread will return from the idle loop when all slaves have finished
// their work at this split point. // their work at this split point.
if (slavesCnt > 1 || Fake)
{
sp.mutex.unlock(); sp.mutex.unlock();
Threads.mutex.unlock(); Threads.mutex.unlock();
@ -330,7 +325,6 @@ void Thread::split(Position& pos, const Stack* ss, Value alpha, Value beta, Valu
// done under lock protection to avoid a race with Thread::available_to(). // done under lock protection to avoid a race with Thread::available_to().
Threads.mutex.lock(); Threads.mutex.lock();
sp.mutex.lock(); sp.mutex.lock();
}
searching = true; searching = true;
--splitPointsSize; --splitPointsSize;