int alltoall__pair_rma(const void *send_buff, int send_count, MPI_Datatype send_type,
void *recv_buff, int recv_count, MPI_Datatype recv_type,
MPI_Comm comm)
int alltoall__pair_rma(const void *send_buff, int send_count, MPI_Datatype send_type,
void *recv_buff, int recv_count, MPI_Datatype recv_type,
MPI_Comm comm)