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.

Original author(s)Evan Phoenix
Initial release2011
Stable release
4.1.0 / August 8, 2019 (2019-08-08)
Written inRuby, C
Operating systemCross-platform
Available inEnglish
TypeWeb server
LicenseBSD 3-Clause

Reception and use

Puma is the web server shipped with Mastodon[1] and recommended by the Heroku hosting provider as a replacement for Unicorn.[2]

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 situations where CPU load was the limiting factor.[3]


  1. Rochko, Eugen (13 April 2017). "Scaling Mastodon".
  2. "Puma is Now the Recommended Ruby Webserver". 23 January 2015.
  3. Pavese, Tommaso (21 December 2016). "Unicorn vs Puma: Rails server benchmarks".
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