title: Puma (web server)
text: # Puma (web server)
  
  Puma is an HTTP web server derived from Mongrel and written by Evan Phoenix. It stresses speed and efficient use of memory.
  
  ## Reception and use
  
  Puma is the web server shipped with Mastodon and recommended by the Heroku hosting provider as a replacement for Unicorn.
  
  Deliveroo published a benchmark comparing the two servers and concluded “Puma performs better than Unicorn in all tests that were either heavily IO-bound or that interleaved IO and CPU work”, but that Unicorn was still slightly better performing in situations where CPU load was the limiting factor.
  
  