I’ve been testing out xCache for a while – primarily as a PHP accelerator.
Early results were really promising – reducing page load times dramatically; and also reducing CPU load as common pages (i.e. the latest blog post and photos) were fed directly from the cache.
There seems to be some kind of memory leak/cache clean up issue with xCache 1.3 – I allocate some amount of RAM for cache (16MB, 64MB, 256MB – it really doesn’t matter) and at some point Apache/PHP starts eating up RAM, then starting to swap – and finally the server grinds to a halt.
xCache is off for now – I’ll keep investigating.