Request::sendrecv(recv_ptr + send_offset, curr_count, send_type, dst,
tag, recv_ptr + recv_offset, mask * recv_count,
recv_type, dst, tag, comm, &status);
Request::sendrecv(recv_ptr + send_offset, curr_count, send_type, dst,
tag, recv_ptr + recv_offset, mask * recv_count,
recv_type, dst, tag, comm, &status);