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Increase max threads to 128

Browse Source 
Thanks to std::bitset we can easily increase
the limit of active threads above 64.

Thanks to Lucas Braesch for pointing at the
correct solution of using std::bitset.

No functional change.
This commit is contained in:
Marco Costalba
2014-03-18 12:07:26 +01:00
parent fa3f6dcbea
commit aab5863dd4
3 changed files with 15 additions and 17 deletions
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src/search.cpp
+9 -12
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@@ -1470,7 +1470,7 @@ void Thread::idle_loop() {
mutex.lock();
// If we are master and all slaves have finished then exit idle_loop
if (this_sp && !this_sp->slavesMask)
if (this_sp && this_sp->slavesMask.none())
{
mutex.unlock();
break;
@@ -1529,14 +1529,14 @@ void Thread::idle_loop() {
searching = false;
activePosition = NULL;
sp->slavesMask &= ~(1ULL << idx);
sp->slavesMask.reset(idx);
sp->nodes += pos.nodes_searched();
// Wake up the master thread so to allow it to return from the idle
// loop in case we are the last slave of the split point.
if ( Threads.sleepWhileIdle
&& this != sp->masterThread
&& !sp->slavesMask)
&& sp->slavesMask.none())
{
assert(!sp->masterThread->searching);
sp->masterThread->notify_one();
@@ -1551,10 +1551,10 @@ void Thread::idle_loop() {
// If this thread is the master of a split point and all slaves have finished
// their work at this split point, return from the idle loop.
if (this_sp && !this_sp->slavesMask)
if (this_sp && this_sp->slavesMask.none())
{
this_sp->mutex.lock();
bool finished = !this_sp->slavesMask; // Retest under lock protection
bool finished = this_sp->slavesMask.none(); // Retest under lock protection
this_sp->mutex.unlock();
if (finished)
return;
@@ -1597,13 +1597,10 @@ void check_time() {
sp.mutex.lock();
nodes += sp.nodes;
Bitboard sm = sp.slavesMask;
while (sm)
{
Position* pos = Threads[pop_lsb(&sm)]->activePosition;
if (pos)
nodes += pos->nodes_searched();
}
for (size_t idx = 0; idx < Threads.size(); ++idx)
if (sp.slavesMask.test(idx) && Threads[idx]->activePosition)
nodes += Threads[idx]->activePosition->nodes_searched();
sp.mutex.unlock();
}