title: Scrapy concurrency strategy
body: <p>What is better method of scaling Scrapy? </p>
  
  <ol>
  <li>By running one <code>scrapy</code> process and increasing <code>CONCURRENT_REQUESTS</code> internal Scrapy's setting</li>
  <li>By running multiple <code>scrapy</code> processes but still focusing on increasing internal setting.</li>
  <li>By increasing quantity of <code>scrapy</code> prcesses with some constant value of internal setting.</li>
  </ol>
  
  <p>If 3 - then what software is better to use for launching multiple scrapy processes? </p>
  
  <p>And what is a best way to distribute <code>scrapy</code> across multiple servers?</p>