int mask, dst_tree_root, my_tree_root, j, k;
int received;
MPI_Datatype sendtype, recvtype;
- int nprocs_completed, tmp_mask, tree_root, is_commutative;
+ int nprocs_completed, tmp_mask, tree_root, is_commutative=0;
comm_size = smpi_comm_size(comm);
rank = smpi_comm_rank(comm);