title: AMQP consumer loads CPU to 100%
body: <p>I have Symfony2 application with <a href="https://github.com/videlalvaro/RabbitMqBundle" rel="nofollow">RabbitMQBundle</a> installed. I've setup consumers and producers as it's described in the bundle documentations and everything works correct. But my consumers started with <strong><em>./app/console rabbitmq:consumer</em></strong> take all available CPU time. Basically consumer does nothing but waiting for a message and output it. If I start demo consumer from <a href="https://github.com/videlalvaro/php-amqplib" rel="nofollow">php-amqplib</a> CPU consumption is almost zero. I tried different virsions of Symfony (2.6 and 2.3) but this does not affect CPU load. My server configuration:</p>
  
  <ol>
  <li>Debian 7</li>
  <li>PHP 5.6.4 (also tried 5.4) </li>
  <li>no database used</li>
  <li>RabbitMq 3.4.2</li>
  </ol>
  
  <p>Is there any way to reduce CPU consumption? Thanks</p>