// (recv_buf+recv_offset), (rcount * num_core), rtype, src, tag, comm, &status);
//MPIC_Isend((recv_buf+send_offset), (scount * num_core), stype, dst, tag, comm, req_ptr++);
// (recv_buf+recv_offset), (rcount * num_core), rtype, src, tag, comm, &status);
//MPIC_Isend((recv_buf+send_offset), (scount * num_core), stype, dst, tag, comm, req_ptr++);