if (size <= num_core) {
XBT_WARN("MPI_bcast_SMP_linear use default MPI_bcast.");
Coll_bcast_default::bcast(buf, count, datatype, root, comm);
if (size <= num_core) {
XBT_WARN("MPI_bcast_SMP_linear use default MPI_bcast.");
Coll_bcast_default::bcast(buf, count, datatype, root, comm);