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Revert previous patch

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It seems we have a speed regression under Linux, anyhow
commit and revert to leave some documentation in case we
want to try again in the future.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-10-24 09:51:49 +01:00
parent 96e589646d
commit 5b445cdf59
2 changed files with 15 additions and 25 deletions
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37
src/search.cpp
View file

@ -2212,9 +2212,6 @@ split_point_start: // At split points actual search starts from here
assert(threadID >= 0 && threadID < MAX_THREADS);
int i;
bool allFinished = false;
while (true)
{
// Slave threads can exit as soon as AllThreadsShouldExit raises,
@ -2230,23 +2227,23 @@ split_point_start: // At split points actual search starts from here
// instead of wasting CPU time polling for work.
while ( threadID >= ActiveThreads
|| threads[threadID].state == THREAD_INITIALIZING
|| threads[threadID].state == THREAD_AVAILABLE)
|| (!sp && threads[threadID].state == THREAD_AVAILABLE))
{
assert(!sp);
assert(threadID != 0);
if (AllThreadsShouldExit)
break;
lock_grab(&MPLock);
// Test with lock held to avoid races with wake_sleeping_thread()
for (i = 0; sp && i < ActiveThreads && !sp->slaves[i]; i++) {}
allFinished = (i == ActiveThreads);
// Retest sleep conditions under lock protection
if ( AllThreadsShouldExit
|| allFinished
|| !( threadID >= ActiveThreads
// Retest condition under lock protection
if (!( threadID >= ActiveThreads
|| threads[threadID].state == THREAD_INITIALIZING
|| threads[threadID].state == THREAD_AVAILABLE))
|| (!sp && threads[threadID].state == THREAD_AVAILABLE)))
{
lock_release(&MPLock);
break;
continue;
}
// Put thread to sleep
@ -2276,19 +2273,14 @@ split_point_start: // At split points actual search starts from here
assert(threads[threadID].state == THREAD_SEARCHING);
threads[threadID].state = THREAD_AVAILABLE;
// Wake up master thread so to allow it to return from the idle loop in
// case we are the last slave of the split point.
if (threadID != tsp->master && threads[tsp->master].state == THREAD_AVAILABLE)
wake_sleeping_thread(tsp->master);
}
// 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.
for (i = 0; sp && i < ActiveThreads && !sp->slaves[i]; i++) {}
allFinished = (i == ActiveThreads);
int i = 0;
for ( ; sp && i < ActiveThreads && !sp->slaves[i]; i++) {}
if (allFinished)
if (i == ActiveThreads)
{
// Because sp->slaves[] is reset under lock protection,
// be sure sp->lock has been released before to return.
@ -2495,7 +2487,6 @@ split_point_start: // At split points actual search starts from here
// Initialize the split point object
splitPoint.parent = masterThread.splitPoint;
splitPoint.master = master;
splitPoint.stopRequest = false;
splitPoint.ply = ply;
splitPoint.depth = depth;

1
src/thread.h
View file

@ -55,7 +55,6 @@ struct SplitPoint {
bool pvNode, mateThreat;
Value beta;
int ply;
int master;
Move threatMove;
SearchStack sstack[MAX_THREADS][PLY_MAX_PLUS_2];