LH_LOAD_MULT
if ((lh->up_load <= (lh->num_items * LH_LOAD_MULT / lh->num_nodes)) && !expand(lh))
if ((lh->num_nodes > MIN_NODES) && (lh->down_load >= (lh->num_items * LH_LOAD_MULT / lh->num_nodes)))
#define UP_LOAD (2 * LH_LOAD_MULT) /* load times 256 (default 2) */
#define DOWN_LOAD (LH_LOAD_MULT) /* load times 256 (default 1) */