MPI_Alloc_mem(MAX_SIZE * sizeof(int), MPI_INFO_NULL, &winbuf);
MPI_Win_create(winbuf, MAX_SIZE * sizeof(int), sizeof(int), MPI_INFO_NULL,
MPI_COMM_WORLD, &window);
MPI_Alloc_mem(MAX_SIZE * sizeof(int), MPI_INFO_NULL, &winbuf);
MPI_Win_create(winbuf, MAX_SIZE * sizeof(int), sizeof(int), MPI_INFO_NULL,
MPI_COMM_WORLD, &window);