NKEYS
"NKEYS ", hashp->NKEYS);
hashp->NKEYS = 0;
hashp->NKEYS, hashp->MAX_BUCKET, hashp->nsegs);
hashp->NKEYS--;
hashp->NKEYS--;
hashp->NKEYS++;
(hashp->NKEYS / (hashp->MAX_BUCKET + 1) > hashp->FFACTOR))