In reply to Tomaž Zaman.

Really? these redis solutions seem simple:
http://www.nodex.co.uk/article/13-04-12/high-performance-caching-with-nginx-redis-and-php
http://eamann.com/tech/ludicrous-speed-wordpress-caching-with-redis/
https://github.com/atomical/redis-wp-cache

or am I missing something?