Is false sharing the case with heap memory?-CodePudding

As I know, false sharing occurs when several threads try to read small and adjacent pieces of data which are placed within the same cache line:

#include <omp.h>
#define NUM_THREADS 4

int main() {
    int arr[NUM_THREADS];

#   pragma omp parallel num_threads(NUM_THREADS)
    {
        const int id = omp_get_thread_num();
        arr[id] // doing something with it
    }
}

What if I create the array dynamically?

int *arr = new int[NUM_THREADS];

Will false sharing take place if I have my array on the heap? Are there some cache line restrictions in this case?

CodePudding user response：

Memory is memory. To the cpu an array on the stack is exactly the same as an array on the heap. So any false sharing problem remains the same.