extern int (*MV2_Bcast_function) (void *buffer, int count, MPI_Datatype datatype,
int root, MPI_Comm comm_ptr);
extern int (*MV2_Bcast_intra_node_function) (void *buffer, int count, MPI_Datatype datatype,
int root, MPI_Comm comm_ptr);
extern int (*MV2_Bcast_function) (void *buffer, int count, MPI_Datatype datatype,
int root, MPI_Comm comm_ptr);
extern int (*MV2_Bcast_intra_node_function) (void *buffer, int count, MPI_Datatype datatype,
int root, MPI_Comm comm_ptr);