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Re:Wordpress.com serves 70k requests/second using Nginx by robmil on Wednesday September 26, 2012 @07:26PM (#4578548)
They have two thousand servers total; that includes database servers, memcached servers, regular backends, and load balancers.

Peter Westwood gave a talk on WP.com's infrastructure in London in January; I've tried to find slides online but I can't, which is a shame because he went into quite a bit of detail about their nginx/HyperDB/memcached/mogileFS setup.

Re:Wordpress.com serves 70k requests/second using Nginx by moepstar on Thursday September 27, 2012 @01:46AM (#4579530)
There's a video from WordCamp 2012 where Barry does some Q&A about large WordPress setups:

http://wordpress.tv/2011/08/31/barry-abrahamson-ask-barry-ab...