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Allow a slave to 'late join' another splitpoint

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Instead of waiting to be allocated, actively search
for another split point to join when finishes its
search. Also modify split conditions.

This patch has been tested with 7 threads SMP and
passed both STC:

LLR: 2.97 (-2.94,2.94) [-1.50,4.50]
Total: 2885 W: 519 L: 410 D: 1956

And a reduced-LTC at  25+0.05
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 4401 W: 684 L: 566 D: 3151

Was then retested against regression in 3 thread case
at standard LTC of  60+0.05:

LLR: 2.96 (-2.94,2.94) [-4.00,0.00]
Total: 40809 W: 5446 L: 5406 D: 29957

bench: 8802105
This commit is contained in:
Joona Kiiski
2014-05-03 18:29:31 +01:00
committed by Marco Costalba
parent 8f6a494ad7
commit f6e98a924a
3 changed files with 53 additions and 6 deletions
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4
src/thread.h
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@@ -77,6 +77,7 @@ struct SplitPoint {
// Shared data
Mutex mutex;
std::bitset<MAX_THREADS> slavesMask;
volatile bool allowLatejoin;
volatile uint64_t nodes;
volatile Value alpha;
volatile Value bestValue;
@@ -113,8 +114,9 @@ struct Thread : public ThreadBase {
Thread();
virtual void idle_loop();
bool attempt_to_latejoin();
bool cutoff_occurred() const;
bool available_to(const Thread* master) const;
bool available_to(const Thread* master, bool latejoin) const;
template <bool Fake>
void split(Position& pos, const Search::Stack* ss, Value alpha, Value beta, Value* bestValue, Move* bestMove,