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b58ecb8)
Also move NodesSincePoll away from the same cache line
of other heavy read accessed only variables.
Fortunatly we don't have anymore write access contention,
but still read access contention in some cases.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
+ // Search depth at iteration 1
+ const Depth InitialDepth = OnePly /*+ OnePly/2*/;
+
// Depth limit for selective search
// Depth limit for selective search
- const Depth SelectiveDepth = 7*OnePly;
+ const Depth SelectiveDepth = 7 * OnePly;
// Use internal iterative deepening?
const bool UseIIDAtPVNodes = true;
// Use internal iterative deepening?
const bool UseIIDAtPVNodes = true;
/// Variables initialized from UCI options
/// Variables initialized from UCI options
- // Minimum number of full depth (i.e. non-reduced) moves at PV and non-PV
- // nodes
- int LMRPVMoves, LMRNonPVMoves;
+ // Minimum number of full depth (i.e. non-reduced) moves at PV and non-PV nodes
+ int LMRPVMoves, LMRNonPVMoves; // heavy SMP read access for the latter
// Depth limit for use of dynamic threat detection
// Depth limit for use of dynamic threat detection
+ Depth ThreatDepth; // heavy SMP read access
// Last seconds noise filtering (LSN)
bool UseLSNFiltering;
// Last seconds noise filtering (LSN)
bool UseLSNFiltering;
Value LSNValue;
// Extensions. Array index 0 is used at non-PV nodes, index 1 at PV nodes.
Value LSNValue;
// Extensions. Array index 0 is used at non-PV nodes, index 1 at PV nodes.
+ // There is heavy SMP read access on these arrays
Depth CheckExtension[2], SingleReplyExtension[2], PawnPushTo7thExtension[2];
Depth PassedPawnExtension[2], PawnEndgameExtension[2], MateThreatExtension[2];
Depth CheckExtension[2], SingleReplyExtension[2], PawnPushTo7thExtension[2];
Depth PassedPawnExtension[2], PawnEndgameExtension[2], MateThreatExtension[2];
- // Search depth at iteration 1
- const Depth InitialDepth = OnePly /*+ OnePly/2*/;
-
- // Node counters, used only by thread[0]
- int NodesSincePoll;
- int NodesBetweenPolls = 30000;
-
// Iteration counters
int Iteration;
// Iteration counters
int Iteration;
- BetaCounterType BetaCounter; // does not have internal data
+ BetaCounterType BetaCounter; // has per-thread internal data
// Scores and number of times the best move changed for each iteration
IterationInfoType IterationInfo[PLY_MAX_PLUS_2];
// Scores and number of times the best move changed for each iteration
IterationInfoType IterationInfo[PLY_MAX_PLUS_2];
bool InfiniteSearch;
bool PonderSearch;
bool StopOnPonderhit;
bool InfiniteSearch;
bool PonderSearch;
bool StopOnPonderhit;
+ bool AbortSearch; // heavy SMP read access
bool Quit;
bool FailHigh;
bool FailLow;
bool Quit;
bool FailHigh;
bool FailLow;
HANDLE SitIdleEvent[THREAD_MAX];
#endif
HANDLE SitIdleEvent[THREAD_MAX];
#endif
+ // Node counters, used only by thread[0] but try to keep in different
+ // cache lines (64 bytes each) from the heavy SMP read accessed variables.
+ int NodesSincePoll;
+ int NodesBetweenPolls = 30000;
+