title: Redis is taking too long to respond
body: <p>Experiencing very high response latency with Redis, to the point of not being able to output information when using the <code>info</code> command through <code>redis-cli</code>.  </p>
  
  <p>This server handles requests from around 200 concurrent processes but it does not store too much information (at least to our knowledge).  When the server is responsive, the <code>info</code> command reports used memory around 20 - 30 MB.</p>
  
  <p>When running <code>top</code> on the server, during periods of high response latency, CPU usage hovers around 95 - 100%.</p>
  
  <p>What are some possible causes for this kind of behavior?</p>