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Document variables with heavy SMP read access

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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>
This commit is contained in:
Marco Costalba 2009-06-03 10:19:29 +02:00
parent b58ecb85c7
commit 2f760cdf8d
1 changed files with 15 additions and 14 deletions
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29
src/search.cpp
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@ -130,8 +130,11 @@ namespace {
/// Constants
// Search depth at iteration 1
const Depth InitialDepth = OnePly /*+ OnePly/2*/;
// Depth limit for selective search
const Depth SelectiveDepth = 7*OnePly;
const Depth SelectiveDepth = 7 * OnePly;
// Use internal iterative deepening?
const bool UseIIDAtPVNodes = true;
@ -187,12 +190,11 @@ namespace {
/// 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 ThreatDepth;
Depth ThreatDepth; // heavy SMP read access
// Last seconds noise filtering (LSN)
bool UseLSNFiltering;
@ -201,19 +203,13 @@ namespace {
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];
// 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;
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];
@ -231,7 +227,7 @@ namespace {
bool InfiniteSearch;
bool PonderSearch;
bool StopOnPonderhit;
bool AbortSearch;
bool AbortSearch; // heavy SMP read access
bool Quit;
bool FailHigh;
bool FailLow;
@ -263,6 +259,11 @@ namespace {
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;
/// Functions