int i, dst, send_base_offset, recv_base_offset, send_chunk, recv_chunk,
send_offset, recv_offset;
int tag = COLL_TAG_ALLGATHER;
int i, dst, send_base_offset, recv_base_offset, send_chunk, recv_chunk,
send_offset, recv_offset;
int tag = COLL_TAG_ALLGATHER;