title: django+uwsgi huge excessive memory usage issue
body: <p>I have a django+uwsgi based website. some of the tables have almost 1 million rows. </p>
  
  <p>After a few website usages, the VIRT memory used the uwsgi process reaches almost 20GB...almost kill my server...</p>
  
  <p>Could you someone tell what may caused this problem? is it my table rows too big? (unlikely. Pinterest has much more data). now, i had to use reload-on-as= 10024
  reload-on-rss= 4800 to kill the workers every few minutes....it is painful...
  any help?</p>
  
  <p>Here is my uwsgi.ini file</p>
  
  <p>[uwsgi]</p>
  
  <pre><code>chdir           = xxx
  module          = xxx.wsgi
  master          = true
  processes       = 2
  socket       =127.0.0.1:8004
  chmod-socket    = 664
  no-orphans = true
  #limit-as=256
  reload-on-as= 10024
  reload-on-rss= 4800
  max-requests=250
  uid = www-data
  gid = www-data
  #chmod-socket = 777
  chown-socket = www-data
  # clear environment on exit
  vacuum          = true
  </code></pre>