title: mongodb - wiredtiger memory usage growing
body: <p>We moved over to wiredtiger and have seen memory usage creep up, with mongodb using 90% of the memory on the system. It seems to be slowly creaping up. Before wiredtiger when we used mmap on mongo 2.x memory would sit at 8%.</p>
  
  <p>I am worried about the operating system killing the process. Is this normal behaviour?</p>
  
  <p>db.serverStatus() - <a href="https://gist.github.com/henryoswald/8ff9cf917e63c2e983dd" rel="nofollow">https://gist.github.com/henryoswald/8ff9cf917e63c2e983dd</a></p>