title: The website is under heavy load + ROR
body: <p>We are running a website with ROR on CentOS 6 with 2 web server and 1 database server. Some times it shows message "The website is under heavy load"... Can some plese help you what to check here.</p>
  
  <p>We are using Passenger 4.0.21 with Ruby 1.8.7 and  Apache 2.2.15. Web server is running with the default settings. </p>
  
  <p>Below is some output of passenger-status:</p>
  
  <p><strong># passenger-status</strong></p>
  
  <pre><code>Version : 4.0.21
  Date    : Thu Dec 12 02:02:44 -0500 2013
  Instance: 20126
  ----------- General information -----------
  Max pool size : 6
  Processes     : 6
  Requests in top-level queue : 0
  
  ----------- Application groups -----------
  /home/web/html#default:
    App root: /home/web/html
    Requests in queue: 100
    * PID: 20290   Sessions: 1       Processed: 53      Uptime: 24h 3m 5s
      CPU: 0%      Memory  : 634M    Last used: 23h 16m 8
    * PID: 22657   Sessions: 1       Processed: 37      Uptime: 23h 15m 55s
      CPU: 0%      Memory  : 609M    Last used: 22h 44m
    * PID: 29147   Sessions: 1       Processed: 146     Uptime: 20h 47m 48s
      CPU: 0%      Memory  : 976M    Last used: 18h 20m
    * PID: 22216   Sessions: 1       Processed: 26      Uptime: 10h 3m 19s
      CPU: 0%      Memory  : 538M    Last used: 9h 44m 4
    * PID: 23306   Sessions: 1       Processed: 75      Uptime: 9h 43m 22s
      CPU: 0%      Memory  : 483M    Last used: 8h 44m 4
    * PID: 25626   Sessions: 1       Processed: 115     Uptime: 8h 46m 42s
      CPU: 0%      Memory  : 540M    Last used: 7h 59m 5
  </code></pre>