Varnish is a HTTP accelerator, build from ground up with performance in mind. Varnish is targeted primarily at the FreeBSD 6/7 and Linux 2.6 platforms, and will take full advantage of the virtual memory system and advanced I/O features offered by these operating systems. You can get more information and the software from Varnish site.

http://varnish.projects.linpro.no/

You can monitor Varnish statistics using varnishstat and varnishtop command.

http://www.ibm.com/developerworks/opensource/library/os-php-varnish/

http://www.lampbuilder.com/articles/polishing-with-varnish

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