- int tag = 101, success = 1; /*, failure = 0, pof2 = 1;*/
- char * send_ptr = (char *) send_buff;
- char * recv_ptr = (char *) recv_buff;
-
- MPI_Comm_rank(comm, &rank);
- MPI_Comm_size(comm, &num_procs);
- MPI_Type_extent(send_type, &send_chunk);
- MPI_Type_extent(recv_type, &recv_chunk);
+ int tag = COLL_TAG_ALLTOALL;
+ char *send_ptr = (char *) send_buff;
+ char *recv_ptr = (char *) recv_buff;
+
+ rank = smpi_comm_rank(comm);
+ num_procs = smpi_comm_size(comm);
+
+ if((num_procs&(num_procs-1)))
+ THROWF(arg_error,0, "alltoall 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);