MPI_Status status, *statuses;
int i, j, src, dst, rank, num_procs, num_reqs, X, Y, Z, block_size, count;
int my_z, two_dsize, my_row_base, my_col_base, my_z_base, src_row_base;
- int src_z_base, send_offset, recv_offset, tag = 1;
+ int src_z_base, send_offset, recv_offset, tag = COLL_TAG_ALLTOALL;
char *tmp_buff1, *tmp_buff2;