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PPQ: Rebuild heap when more than half of the elements were inserted #5

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PPQ: Rebuild heap when more than half of the elements were inserted #5

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13 changes: 9 additions & 4 deletions include/stxxl/bits/containers/parallel_priority_queue.h
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Original file line number Diff line number Diff line change
Expand Up @@ -2769,10 +2769,15 @@ class parallel_priority_queue
for (long p = 0; p < static_cast<long>(m_num_insertion_heaps); ++p)
{
// reestablish heap property: siftUp only those items pushed
for (size_t index = m_proc[p]->heap_add_size; index != 0; ) {
std::push_heap(m_proc[p]->insertion_heap.begin(),
m_proc[p]->insertion_heap.end() - (--index),
m_compare);
// if few items were pushed. Otherwise, rebuild the heap.
if (m_proc[p]->heap_add_size*2 < m_proc[p]->insertion_heap.size()) {
for (size_t index = m_proc[p]->heap_add_size; index != 0; ) {
std::push_heap(m_proc[p]->insertion_heap.begin(),
m_proc[p]->insertion_heap.end() - (--index),
m_compare);
}
} else {
std::make_heap(m_proc[p]->insertion_heap.begin(), m_proc[p]->insertion_heap.end(), m_compare);
}

#if STXXL_PARALLEL
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