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Clarify we don't late join with only 2 threads

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Thanks to Gary for pointing this out.

No functional change.
This commit is contained in:
Marco Costalba
2015-02-19 23:12:59 +01:00
parent 950c8436ed
commit 667f350737
1 changed files with 3 additions and 1 deletions
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4
src/search.cpp
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@@ -1604,8 +1604,10 @@ void Thread::idle_loop() {
{ {
assert(this != Threads[i]); assert(this != Threads[i]);
assert(!(this_sp && this_sp->slavesMask.none())); assert(!(this_sp && this_sp->slavesMask.none()));
assert(Threads.size() > 2);
// Compute the recursive split points chain size // Prefer to join to SP with few parents to reduce the probability
// that a cut-off occurs above us, and hence we waste our work.
int level = -1; int level = -1;
for (SplitPoint* spp = Threads[i]->activeSplitPoint; spp; spp = spp->parentSplitPoint) for (SplitPoint* spp = Threads[i]->activeSplitPoint; spp; spp = spp->parentSplitPoint)
level++; level++;