MPI_Aint send_chunk, recv_chunk;
MPI_Status s;
int i, src, dst, rank, num_procs;
- int tag = 1;
+ 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);
send_chunk *= send_count;
recv_chunk *= recv_count;
- smpi_mpi_barrier(comm);
+ mpi_coll_barrier_fun(comm);
for (i = 0; i < num_procs; i++) {
src = dst = rank ^ i;
smpi_mpi_sendrecv(send_ptr + dst * send_chunk, send_count, send_type, dst,