leveldb-benchmark-random-read

for {
  t := time.Now().UnixNano()
  for i := 0; i < 1000; i++ {
   var key [2]byte
   rand.Read(key[:])
   it := mainDB.NewIterator(*kv.NewRangeWithBytesPrefix(key[:]))
   if it.Next() {
    it.Value()
   }
   it.Release()
  }
  fmt.Println(time.Duration(time.Now().UnixNano() - t))
  select {
  case <-exitSignal.Done():
   return nil
  default:
  }
 }