title: Solr always use more than 90% of physical memory
body: <p>I have 300000 documents stored in solr index. And used <strong>4GB RAM</strong> for solr server. But It consumes more than <strong>90%</strong> of physical memory. So I moved to my data to a new server which has <strong>16 GB RAM</strong>. Again solr consumes more than <strong>90%</strong> memory. I don't know how to resolve this issue. I used default MMapDirectory and solr version 4.2.0. Explain me if you have any solution or the reason for this.</p>