title: High CPU load running php processes
body: <p>I have dedicate server with 3.1GHz single quad core CPU with 32 GB RAM.
  It works as a web server and configured to:
  Apache 2.4 + MPM Worker + Mod_fcgid</p>
  
  <p>When I run top command, I see high CPU usage by PHP processes of website.  Below is a snapshot</p>
  
  <pre><code>Tasks: 193 total,   1 running, 112 sleeping,   1 stopped,  79 zombie
  Cpu(s): 84.0%us,  1.4%sy,  0.0%ni, 12.3%id,  2.3%wa,  0.0%hi,  0.0%si,  0.0%st
  Mem:  33554432k total, 26637508k used,  6916924k free,        0k buffers
  Swap:        0k total,        0k used,        0k free, 10471152k cached
  
    PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                               
   8415 mysql     20   0 12.5g 4.1g 6348 S 115.1 12.8   5107:00 mysqld                                                                                                                
  18687 domainus  20   0  303m 110m  44m S 64.5  0.3   1:05.51 php                                                                                                                    
  18728 domainus  20   0  311m 118m  46m S 42.7  0.4   1:00.57 php                                                                                                                    
  18732 domainus  20   0  333m 140m  45m S 40.3  0.4   1:19.61 php                                                                                                                    
  17371 domainus  20   0  306m 114m  46m S 32.5  0.3   0:57.16 php                                                                                                                    
  18726 domainus  20   0  278m  87m  47m S 24.8  0.3   1:48.62 php                                                                                                                    
  14765 domainus  20   0  324m 133m  47m S 17.7  0.4   4:00.94 php      
  </code></pre>
  
  <p>I want to be sure that, my Apache configuration is right and the problem is with the PHP code, any suggestions on how to drill down the issue?</p>