title: Resident Memory increases with Lucene Mmap
body: <p>Currently i'm Mmap 1.5 GB of lucene index, i noticed virtual memory size gone up from 14GB to 23GB(that's fine this size includes the size of swapout pages in hard-drive). But i'm witnessing increase in RSS(resident-size) size from 8GB to 12GB if we use MMAP. Any suggestion to reduce RSS usage without compensating performance.</p>
  
  <p>Regards,<br>
  Raghavan</p>