title: Running Solr in memory?
body: <p>One night I was drinking a pint at a local bar and struck up a conversation with the chap next to me. As it turned out, not only was he a fellow developer, but he also used Solr a lot. As we got to talking about how awesome Solr was, he mentioned something that I've never been able to figure out. He said, "The way to make Solr really perform is to have it run in memory." </p>
  
  <p>Alas, I did not get his name and despite googling for an answer, I've never really found anything concrete. What do you think he meant by this?</p>