title: Why load balance between multiple instances of an application on a single server?
body: <p>I am working with Pyramid, and when it comes to deploying, I came across this <a href="http://docs.pylonsproject.org/projects/pyramid_cookbook/en/latest/deployment.html" rel="nofollow">tutorial</a>.</p>
  
  <p>What is the point of running multiple instances of the same app on the same server?
  Is there an optimal amount of instances I should run?</p>
  
  <p>Thanks.</p>