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Varnish: designing high-performance cache servers

Varnish's value?

Apache Traffic Server, G-WAN, Lighttpd, and Nginx are all faster than Varnish:

http://nbonvin.wordpress.com/2011/03/24/serving-small-static-files-which…

Varnish consumes more CPU resources while processing less requests than all those Web servers… questioning its value as an “HTTP accelerator”:

G-WAN Web server: 142,000 Requests per second
Varnish Cache server: 28,000.