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A comment on Heroku's Ugly Secret: The story of how the cloud-king turned its back on Rails. Parent comment

Re:Heroku's Ugly Secret: The story of how the cloud-king tur... by barmstrong on Wednesday February 13, 2013 @07:13PM (#5216677)
This is true - unicorn masks the symptoms for a period of time but does not solve the underlying problem in the way a global request queue would.

Also, if the unicorn process is doing something cpu intensive (vs waiting on a 3rd party service or io etc) then it won't serve 3 requests simultaneously as fast as single processes would.

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Re:Heroku's Ugly Secret: The story of how the cloud-king tur... by rjacoby5 on Thursday February 14, 2013 @10:48AM (#5219954)
One of the hidden costs of Unicorn is spin-up time. Unicorn takes a long time to start, then fork. We would get a ton of request timeouts during this period. Switching back to Thin, we never got timeouts during deploys - even under very heavy load.
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