Request::sendrecv(send_ptr + dst * send_chunk, send_count, send_type, dst,
tag, recv_ptr + src * recv_chunk, recv_count, recv_type,
src, tag, comm, &s);
Request::sendrecv(send_ptr + dst * send_chunk, send_count, send_type, dst,
tag, recv_ptr + src * recv_chunk, recv_count, recv_type,
src, tag, comm, &s);