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Don't wake up threads at the beginning of the search

Browse source 
But only when needed, after a split point. This behaviour
does not apply when useSleepingThreads is false, becuase
in this case threads are not woken up at split points so
must be already running.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2012-02-12 14:07:21 +01:00
parent 86e159997c
commit b1768c115c
2 changed files with 9 additions and 11 deletions
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6
src/search.cpp
View file

@ -307,11 +307,7 @@ void Search::think() {
<< endl;
}
for (int i = 0; i < Threads.size(); i++)
{
Threads[i].maxPly = 0;
Threads[i].wake_up();
}
Threads.set_size(Options["Threads"]);
// Set best timer interval to avoid lagging under time pressure. Timer is
// used to check for remaining available thinking time.

14
src/thread.cpp
View file

@ -171,16 +171,14 @@ bool Thread::is_available_to(int master) const {
}
// read_uci_options() updates number of active threads and other parameters
// according to the UCI options values. It is called before to start a new search.
// read_uci_options() updates internal threads parameters from the corresponding
// UCI options. It is called before to start a new search.
void ThreadsManager::read_uci_options() {
maxThreadsPerSplitPoint = Options["Max Threads per Split Point"];
minimumSplitDepth = Options["Min Split Depth"] * ONE_PLY;
useSleepingThreads = Options["Use Sleeping Threads"];
set_size(Options["Threads"]);
}
@ -189,11 +187,11 @@ void ThreadsManager::read_uci_options() {
void ThreadsManager::set_size(int cnt) {
assert(cnt > 0 && cnt <= MAX_THREADS);
assert(cnt > 0 && cnt < MAX_THREADS);
activeThreads = cnt;
for (int i = 1; i < MAX_THREADS; i++) // Ignore main thread
for (int i = 0; i < MAX_THREADS; i++)
if (i < activeThreads)
{
// Dynamically allocate pawn and material hash tables according to the
@ -201,8 +199,12 @@ void ThreadsManager::set_size(int cnt) {
// possible threads if only few are used.
threads[i].pawnTable.init();
threads[i].materialTable.init();
threads[i].maxPly = 0;
threads[i].do_sleep = false;
if (!useSleepingThreads)
threads[i].wake_up();
}
else
threads[i].do_sleep = true;