#pragma omp parallel for 罗致程序线程数增加

#pragma omp parallel for 导致程序线程数增加
在用了 #pragma omp parallel for ，设置num_threads 为2后， 
程序的线程数不断增加， 内存数也不断增加，

为什么会有这种情况呢？

C/C++ code

#pragma omp parallel for shared(elementIndexToBoundsSet, elementIndexToSizeSet, bufferPtr) private(currentCoord) firstprivate(elementIndex, threadId) num_threads(numOfThreads)    for (int i = 0; i < bufferSize; i++)    {        // Get element index        elementIndex = bufferPtr[i];        // In case no element - continue        if (elementIndex == 0)            continue;        // One time read of the threadId        if (threadId == -1)            threadId = omp_get_thread_num();                // Update element size        elementIndexToSizeSet->at(threadId)->at(elementIndex)++;    }