MPI_Aint send_chunk, recv_chunk;
MPI_Status s;
int i, src, dst, rank, num_procs, next_partner;
- int tag = 1; /*, failure = 0; */
+ int tag = COLL_TAG_ALLTOALLV; /*, failure = 0; */
char send_sync = 'a', recv_sync = 'b';
char *send_ptr = (char *) send_buff;
rank = smpi_comm_rank(comm);
num_procs = smpi_comm_size(comm);
+
+ if((num_procs&(num_procs-1)))
+ THROWF(arg_error,0, "alltoallv pair algorithm can't be used with non power of two number of processes ! ");
+
send_chunk = smpi_datatype_get_extent(send_type);
recv_chunk = smpi_datatype_get_extent(recv_type);